FANUC Series 90-30 PLC. Installation and Hardware Manual (GFK-0356P)

DC Input Only Power Supplies

IC693PWR322 Standard Power Supply, 24/48 VDC Input

The IC693PWR322 is a 30 watt output power supply designed for 24 VDC or 48 VDC

nominal inputs. It will accept an input voltage range from 18 VDC to 56 VDC. Although it

is capable of maintaining all outputs within specifications with input voltages as low as 18

VDC, it will not start with initial input voltages of less than 21 VDC. This power supply

provides the following outputs:

+ 5 VDC output.

+ 24 VDC ”Relay” power output which provides power to circuits on Series 90-30

Output Relay modules.

“Isolated” +24 VDC, which is used internally by some modules, can also be used to

provide external power for 24 VDC Input modules.

The load capacity for each output of this power supply is shown in the following table.

Table 4-6. IC693PWR322 Power Supply Capacities

Catalog

Load

Number

Capacity

Input

Output Capacities (Voltage/Power

)

IC693PWR322

30 Watts

24 or 48 VDC

+5 VDC

+24 VDC Isolated

+24 VDC Relay

15 watts

20 watts

15 watts

Total of all outputs combined cannot exceed 30 watts.

a44854

PWR

IC693PWR322

SYSTEM

GE Fanuc

STATUS

Series 90-30

RUN

INDICATORS

BATT

PROGRAMMABLE

CONTROLLER

STANDARD

POWER SUPPLY

PROGRAMMABLE CONTROLLER

INPUT

CONNECTIONS

ÎÎÎÎ

24/48 VDC

FOR

50 WATT

DC POWER

ÎÎÎÎ

SOURCE

ÎÎÎÎ

INTERNAL POWER

ÎÎÎÎ

SOURCE FOR

MODULES REQUIRING

24 VDC

ÎÎÎÎ

24VDC

OUTPUT

0.8A MAX.

ÎÎÎÎ

RS-485

ÎÎÎ

COMPATIBLE

SERIAL PORT

ÎÎÎ

BATTERY

LITHIUM

CONNECTORS

ÎÎÎ

BACK-UP

BATTERY

Figure 4-4. Series 90-30 24/48 VDC Input Power Supply - IC693PWR322

GFK-0356P

Chapter 4 Power Supplies

4-7

Table 4-7. Specifications for IC693PWR322 Power Supply

Nominal Rated Voltage

24 or 48 VDC

Input Voltage Range

Start

21 to 56 VDC

Run

18 to 56 VDC

Input Power

50 watts maximum at full load

Inrush Current

4A peak, 100 ms maximum

Output Power

5 VDC: 15 watts maximum

24 VDC Relay: 15 watts maximum

24 VDC Isolated: 20 watts maximum

NOTE: 30 watts maximum total (all three outputs)

Output Voltage

5 VDC: 5.0 VDC to 5.2 VDC (5.1 VDC nominal)

24 VDC Relay: 24 to 28 VDC

24 VDC Isolated: 21.5 VDC to 28 VDC

Protective Limits

Overvoltage:

5 VDC output: 6.4 to 7 V

Overcurrent;

5 VDC output: 4 A maximum

Holdup Time:

14 ms minimum

Standards

Refer to data sheet, GFK-0867B, or later version for

product standards, and general specifications.

Calculating Input Power Requirements for IC693PWR322

The following graph is a typical 24/48 VDC power supply efficiency curve. A basic

procedure for determining efficiency of the 24/48 VDC power supply follows the figure.

a44963

45W

AVERAGE

INPUT

POWER

(WATTS)

ÎÎ

TOTAL OUTPUT POWER (WATTS)

Figure 4-5. Typical Efficiency Curve for 24/48 VDC Power Supply

Note

Start-up surge at full load is 4 amps for 250 milliseconds (maximum).

4-8

Series 90-30 PLC Installation and Hardware Manual - October 1999

GFK-0356P

IC693PWR328 Standard Power Supply, 48 VDC Input

The IC693PWR328 is a 30 watt output power supply designed for 48 VDC nominal input. It

will accept an input voltage range from 38 VDC to 56 VDC. This power supply provides

the following outputs:

+ 5 VDC output.

+ 24 VDC ”Relay” power output which provides power to circuits on Series 90-30

Output Relay modules.

“Isolated” +24 VDC, which is used internally by some modules, can also be used to

provide external power for 24 VDC Input modules.

The load capacity for each output of this power supply is shown in the following table.

Table 4-8. IC693PWR328 Power Supply Capacities

Catalog

Load

Number

Capacity

Input

Output Capacities (Voltage/Power

)

IC693PWR328

30 Watts

48 VDC

+5 VDC

+24 VDC Isolated

+24 VDC Relay

15 watts

20 watts

15 watts

Total of all outputs combined cannot exceed 30 watts.

a44854A

PWR

IC693PWR328

SYSTEM

GE Fanuc

STATUS

Series 90-30

RUN

INDICATORS

BATT

PROGRAMMABLE

CONTROLLER

STANDARD

POWER SUPPLY

PROGRAMABLE CONTROLLER

ÎÎÎÎ

INPUT

CONNECTIONS

FOR

48 VDC

ÎÎÎÎ

50 WATT

DC POWER

SOURCE

ÎÎÎÎ

INTERNAL POWER

SOURCE FOR

ÎÎÎÎ

MODULES REQUIRING

24 VDC

OUTPUT

24VDC

ÎÎÎÎ

0.8A MAX.

ÎÎÎÎ

ÎÎRS-485

COMPATIBLE

ÎÎ

SERIAL PORT

BATTERY

ÎÎ

LITHIUM

CONNECTORS

BACK-UP

ÎÎ

BATTERY

Figure 4-6. Series 90-30 48 VDC Input Power Supply - IC693PWR328

4-10

Series 90-30 PLC Installation and Hardware Manual - October 1999

GFK-0356P

Table 4-9. Specifications for IC693PWR328 Power Supply

Nominal Rated Voltage

48 VDC

Input Voltage Range

38 to 56 VDC

Input Power

50 watts maximum at full load

Inrush Current

4A peak, 100 ms maximum

Output Power

5 VDC: 15 watts maximum

24 VDC Relay: 15 watts maximum

24 VDC Isolated: 20 watts maximum

NOTE: 30 watts maximum total (all three outputs)

Output Voltage

5 VDC: 5.0 VDC to 5.2 VDC (5.1 VDC nominal)

24 VDC Relay: 24 to 28 VDC

24 VDC Isolated:

21.5 VDC to 28 VDC

Protective Limits

Overvoltage:

5 VDC output: 6.4 to 7 V

Overcurrent;

5 VDC output: 4 A maximum

Holdup Time:

14 ms minimum

Standards

Refer to data sheet, GFK-0867B, or later version for

product standards, and general specifications.

Calculating Input Power Requirements for IC693PWR328

The following graph is a typical 48 VDC power supply efficiency curve. A basic

procedure for determining efficiency of the 48 VDC power supply follows the figure.

a44963

45W

AVERAGE

INPUT

POWER

(WATTS)

ÎÎ

TOTAL OUTPUT POWER (WATTS)

Figure 4-7. Typical Efficiency Curve for IC693PWR328 Power Supply

Note

Start-up surge at full load is 4 amps for 250 milliseconds (maximum).

GFK-0356P

Chapter 4 Power Supplies

4-11

IC693PWR331 High Capacity Power Supply, 24 VDC Input

The Series 90-30 DC input High Capacity power supply (IC693PWR331) is a 30 watt

wide range supply designed for 24 VDC nominal inputs. For applications requiring greater

+5V current capacity than is available with the standard supply, this supply allows all 30 watts to

be consumed from the +5 V output. It will accept an input voltage range from 12 VDC to 30

VDC. Although it is capable of maintaining all outputs within specifications with input

voltages as low as 12 VDC, it will not start with initial input voltages of less than 18 VDC.

This power supply provides the following outputs:

+ 5 VDC output.

+ 24 VDC ”Relay” power output which provides power to circuits on Series 90-30

Output Relay modules.

“Isolated” +24 VDC, which is used internally by some modules, can also be used to

provide external power for 24 VDC Input modules.

The load capacity for each output of this power supply is shown in the following table.

Table 4-10. IC693PWR331 Power Supply Capacities

Catalog

Load

Number

Capacity

Input

Output Capacities (Voltage/Power

)

IC693PWR331

30 Watts

12 to 30 VDC

+5 VDC

+24 VDC Isolated

+24 VDC Relay

30 watts

20 watts

15 watts

Total of all outputs combined cannot exceed 30 watts.

a45625A

PWR

IC693PWR331

SYSTEM

GE Fanuc

STATUS

Series 90-30

RUN

INDICATORS

BATT

HIGH CAPACITY

POWER SUPPLY

PROGRAMMABLE CONTROLLER

+ INPUT

24 VDC

ÎÎÎÎ

50 WATT

CONNECTIONS FOR

ÎÎÎÎ

DC POWER SOURCE

ÎÎÎÎ

24 VDC

INTERNAL POWER SOURCE FOR

OUTPUT

MODULES REQUIRING 24VDC

0.8A MAX.

ÎÎÎÎ

RS-485

ÎÎÎ

COMPATIBLE

SERIAL PORT

ÎÎÎ

BATTERY

LITHIUM

CONNECTORS

ÎÎÎ

BACK-UP

BATTERY

Figure 4-8. Series 90-30 24 VDC Input High Capacity Power Supply - IC693PWR331

GFK-0356P

Chapter 4 Power Supplies

4-13

Table 4-11. Specifications for IC693PWR331 Power Supply

Nominal Rated Voltage

24 VDC

Input Voltage Range

Start

18 to 30 VDC

Run

12 to 30 VDC

Input Power

50 watts maximum at full load

Inrush Current

Output Power

5 VDC: 30 watts maximum

24 VDC Relay: 15 watts maximum

24 VDC Isolated: 20 watts maximum

NOTE: 30 watts maximum total (all three outputs)

Output Voltage

5 VDC: 5.0 VDC to 5.2 VDC (5.1 VDC nominal)

24 VDC Relay: 19.2 to 28.8 VDC

24 VDC Isolated: 19.2 VDC to 28.8 VDC

Protective Limits

Overvoltage:

5 VDC output: 6.4 to 7 V

Overcurrent;

5 VDC output: 7 A maximum

Holdup Time:

10 ms minimum

Standards

Refer to data sheet, GFK-0867B, or later version for

product standards, and general specifications.

Dependent on installation and power supply impedance characteristics.

Derate per Figure 2-22 at ambient temperatures above 50 C (122 F).

Current Derating for Higher Temperatures

6.1

6.0

5.8

5.6

5.4

5.2

5 VDC

5.0

CURRENT

4.8

4.6

4.4

4.2

4.0

AMBIENT TEMPERATURE ( C)

Figure 4-9.

5 VDC Current Output Derating for Temperatures above

50C

(122F)

4-14

Series 90-30 PLC Installation and Hardware Manual - October 1999

GFK-0356P

Calculating Input Power Requirements for IC693PWR331

Use the following procedure to determine input power requirements for the 24 VDC

High Capacity Power Supply:

Determine total output power load from typical specifications listed for

individual modules at the end of this chapter.

Multiply the output power by 1.5 to determine the input power value.

Divide the input power value by the operating source voltage to determine the

input current requirements

Use the lowest input voltage to determine the maximum input current

Allow for start-up surge current requirements

Allow margins (10% to 20%) for variations

GFK-0356P

Chapter 4 Power Supplies

4-15

Field Wiring Connections to the DC Input-Only Power Supplies

DC Power Source Connections

The + and - wires from the DC power source connect to the top two terminals on

the terminal strip. The + wire should be connected to the top terminal screw, and

the - wire to the second screw (counting from the top down). The ground

connection connects to the third screw. This connection scheme is clearly marked

on the front of these power supplies.

Isolated 24 VDC Supply Output Connections

The bottom two terminals of the power supply terminal strip provide connections

to the Isolated +24 volt DC output which can be used to provide power for

external circuits (within power limitations of the supply).

Caution

If the Isolated 24 VDC supply is overloaded or shorted, the

Programmable Logic Controller will stop operation.

4-16

Series 90-30 PLC Installation and Hardware Manual - October 1999

GFK-0356P

Common Series 90-30 Power Supply Features

Status Indicator Lights on all Power Supplies

Four LEDs are located on the upper right front of the power supply faceplate. The

purpose of these LEDs is as follows:

PWR

The top green LED, labeled PWR, provides an indication of the operating state

of the power supply. The LED is ON when the power supply has a correct

source of power and is operating properly, and OFF when a power supply fault

occurs or power is not applied.

The second green LED, labeled OK, is steady ON if the PLC is operating

properly, and OFF if a problem is detected by the PLC.

RUN

The third green LED, labeled RUN, is steady ON when the PLC is in the RUN

mode.

BATT

The bottom red LED, labeled BATT, will be ON if the memory backup battery

voltage is too low to maintain the memory under a loss of power condition;

otherwise it remains OFF. If this LED is ON, the Lithium battery must be

replaced before removing power from the rack, or PLC memory may be lost.

Input Overvoltage Protection Devices

This information applies to all Series 90-30 power supplies except IC693PWR322

and IC693PWR328. The overvoltage protection devices for this power supply are

connected internally to pin 4 on the user terminal strip. This pin is normally

connected to frame ground (pin 3) with the supplied jumper strap which is

installed at the factory. If overvoltage protection is not required or is supplied

upstream, this feature can be disabled by removing the jumper strap from pins 3

and 4.

If you want to Hi-pot test this supply, overvoltage protection must be disabled

during the test by removing the terminal strip jumper strap. Re-enable

overvoltage protection after testing by reinstalling the strap.

GFK-0356P

Chapter 4 Power Supplies

4-17

a47106

Frame Ground

Jumper Strap Connects

Overvoltage Protection

Devices to Frame Ground

Screw Terminals

on Terminal Board

Figure 4-10. Overvoltage Protection Devices and Jumper Strap

Output Voltage Connections to Backplane (All Supplies)

The following figure illustrates how these three output voltages are connected

internally to the backplane on the baseplate. The voltage and power required by

modules installed on the baseplate is supplied through the baseplate connectors.

a43845

POWER SUPPLY

BACKPLANE

USE/COMMENTS

USED INTERNALLY ON ANALOG INPUT,

I 24V

ANALOG OUTPUT, AND DC INPUT MODULES.

ALSO AVAILABLE ON EXTERNAL

TERMINALS ON DC INPUT MODULES AND

IGND

ON FRONT OF POWER SUPPLY FOR

USER APPLICATIONS.

R24V

USED INTERNALLY ON

RELAY OUTPUTS

RGND

SINGLE

POINT

CONNECTION

P5V

USED INTERNALLY ON CPU,

INPUTS, OUTPUTS, ETC.

LGND

2 POINT

CONNECTION

FGND

EXTERNAL CONNECTION

TO EARTH GROUND.

Figure 4-11. Interconnection of Power Supplies

4-18

Series 90-30 PLC Installation and Hardware Manual - October 1999

GFK-0356P

Overcurrent Protection (all Supplies)

The 5V logic output is electronically limited to 3.5 amps (7 amps for high capacity

supplies). An overload (including short circuits) is sensed internally and causes the

supply to shut down. The supply will continually try to restart until the overload is

removed. An internal fuse in the input line is provided as a backup. The supply will

usually shut down before the fuse blows. The fuse also protects against internal supply

faults.

Timing Diagram

The timing diagram below shows the relationship of the DC input to the DC outputs

and to the Power Supply OK signal (PSOK) generated by the power supply. When

power is first applied, the PSOK signal goes false. This line remains false for a minimum

of 20 msec after the +5V bus is within specifications, then it becomes true.

If input power is interrupted, the +5V bus will remain within specifications and PSOK

will remain true a minimum of 10 milliseconds. PSOK then goes false. The +5V bus will

remain within specifications for an additional 4 milliseconds minimum to allow an

orderly shutdown of the system.

a44964

INPUT

POWER

MOMENTARY

POWER

OFF

LOSS

VOLTAGE

OVERSHOOT

5% (MAX)

+5V OUTPUT

(5.1V TYP.)

97% (MIN)

HOLD

TIME

20MS

10MS

(MIN)

4MS

(MIN)

PSOK

HOLD-UP TIME: 20 ms, minimum for IC693PWR321/330

14 ms, minimum for IC693PWR322

10 ms, minimum for IC693PWR331/332

Figure 4-12. Timing Diagram for all Series 90-30 Power Supplies

GFK-0356P

Chapter 4 Power Supplies

4-19

CPU Serial Port Connector on Power Supply (All Supplies)

A 15-pin D-type female connector, accessed by opening the hinged door on the right

front of the power supply, provides the connection to a CPU serial port which is used to

connect to:

A programmer (usually a personal computer) running GE Fanuc PLC

programming software.

The GE Fanuc Hand-Held Programmer.

Other serial devices.

a43832

ÎÎÎ

ÎÎÎÎ

RS-485

COMPATIBLE

SERIAL PORT

Figure 4-13. Serial Port Connector

The serial port connector is only functional in a power supply that is installed in a

baseplate that also contains the CPU. The serial port is not functional on a power supply

that is installed in an expansion or remote baseplate.

Any device connected to the serial port that uses +5 VDC power from the Series

90-30 power supply must be included in the calculation for maximum power

consumption (see the heading “Power Supply Loading Calculations” in Chapter 12).

CPU Serial Port Information

The serial port connector on the power supply accesses the CPU serial port, which is a

feature of all Series 90-30 CPUs. See Chapter 5, “CPUs” for infomation on this serial port.

Backup Battery for RAM Memory (All Supplies)

The long-life Lithium battery (IC693ACC301) used to maintain the contents of the

CMOS RAM memory in the CPU is accessed by removing the cover plate located at the

bottom of the power supply faceplate. This battery is mounted on a plastic clip attached

to the inside of this cover.

The battery is wired to a small Berg female connector that connects to either of the two

Berg male connectors mounted on the Power Supply printed circuit board. This battery

can be replaced with power applied to the PLC.

4-20

Series 90-30 PLC Installation and Hardware Manual - October 1999

GFK-0356P

Chapter

CPUs

CPU Types for Series 90-30 PLCs

There are numerous CPU models available for the Series 90-30 PLC which differ in speed,

I/O capacity, size of user memory, and advanced features. This variety of models gives a

system designer considerable flexibility in choosing the one best suited to the system

being designed. There are two basic types of CPUs, Embedded and Modular. The

embedded types fulfill the need for a good low cost PLC, but lack the power,

expandability, and versatility of the modular systems. In the embedded types, the CPU

is built into the baseplate. In the modular types, the CPU is contained inside a plug-in

module.

Embedded CPUs

The embedded CPUs are part of an embedded CPU baseplate. In these products, the

CPU and memory integrated circuit chips are soldered to the backplane board of the

baseplate. This chapter discusses the CPU features of these products. Details about the

baseplate features are located in Chapter 2. There are three different embedded CPUs:

Model 311 (IC693CPU311), Model 313 (IC693CPU313), and Model 323 (IC693CPU323). The

embedded CPUs have the following basic features:

The CPU type cannot be changed. It is soldered to the backplane board in

the baseplate.

They do not support the use of Expansion or Remote racks, so an embedded

CPU baseplate does not have an expansion connector like the modular

baseplates do. This means that if you have an application that requires more

than 10 modules, you will have to use a modular CPU system.

The models 311 and 313 are 5-slot baseplates, and the model 323 is a 10-slot

baseplate. Since they do not require a plug-in CPU module, all numbered

slots, including Slot 1, can be used for I/O or Option modules.

The memory back-up battery is located in the Power Supply module; so if

the Power Supply is unplugged from the baseplate, the battery will be

disconnected from the memory circuits, which are located on the backplane

circuit board. However, the backplane circuit board contains a high value

capacitor, called a ”super capacitor,” that can store enough charge to

maintain the memory circuits for a short period of time if the Power Supply

is removed or its battery is disconnected. See the section “Super Capacitor

Memory Backup” in Chapter 6.

These CPUs do not have a time-of-day (TOD) clock.

5-1

GFK-0356P

a44563A

Replaceable System (firmware) PROM

Socket for Optional Program PROM

SYSTEM

PROGRAM

PROM

PROGRAMMABLE

CONTROLLER

ÎÎ

Description Label

BASE 5-SLOT

Says ”With CPU”

WITH CPU

ÎÎ

CAUTION

ÎÎ

NON-CPU SLOTS

USER PROGRAM

AND REGISTER

VALUES MAY BE

Memory Backup

LOST IF POWER

SUPPLY IS

Warning Label

REMOVED FOR

LONGER THAN

1 HOUR

I/O-1

I/O-2

I/O-3

I/O-4

I/O-5

POWER

SUPPLY

Figure 5-1. Models 311 and 313 (5-Slot) Embedded CPU Baseplates

Modular CPUs

The modular CPUs consist of a CPU, memory, and associated integrated circuit chips

soldered to circuit board which is mounted in a plug-in module. The modular CPUs

include the model CPU331 and higher. The modular CPUs have the following basic

features:

A CPU module must be installed in Slot 1 of a modular CPU baseplate. Slot

1 is a unique size and type that only fits a CPU module (or special Option

modules). Slot 1 is labeled CPU/1. Details on modular CPU baseplates are

located in Chapter 2.

Modular CPUs support expansion and remote baseplates, so A 25-pin

D-type female expansion connector is located at the right end of the CPU

baseplate for connection to an expansion or remote baseplate.

Since the CPU is modular, it can readily be replaced or changed to a different

type if desired.

Only one CPU is allowed per system, and it must be mounted in a CPU

baseplate. If more than one baseplate is used in a system, the additional

ones must be either expansion or remote types that do not contain a CPU.

A modular CPU baseplate is always assigned, by default, Rack Number 0.

All have a time-of-day (TOD) clock.

5-2

Series 90-30 PLC Installation and Hardware Manual - October 1999

GFK-0356P

a44564

PROGRAMMABLE

CONTROLLER

BASE 5-SLOT

CAUTION

NON-CPU SLOTS

USER PROGRAM

I/O Bus

Memory Backup

AND REGISTER

Expansion

VALUES MAY BE

Warning Label

LOST IF POWER

Connector

SUPPLY IS

REMOVED FOR

LONGER THAN

1 HOUR

CPU/1

I/O-2

I/O-3

I/O-4

I/O-5

POWER

SUPPLY

CPU Slot (Slot 1)

Figure 5-2. IC693CHS397 5-Slot Modular CPU Baseplate

General CPU Features

Microprocessor

The microprocessor type varies by the CPU model:

80188microprocessorforCPUmodels311/313/323/331

80C188XL microprocessor for CPU models 340/341

80386EX microprocessor for CPU models 350-364.

The microprocessor provides all fundamental sweep and operation control, and

execution of all non-boolean (as used here, the term boolean refers to discrete logic such

as contacts and coils) functions. Boolean functions in the modular CPUs are handled by

a dedicated VLSI (Very Large Scale Integration) Instruction Sequencer Coprocessor

(ISCP). All Series 90-30 CPUs use RAM working memory.

CPU Serial Port (Connector on Power Supply)

A 15-pin D-type female connector, accessed by opening the hinged door on the right

front of the power supply, provides the connection to a CPU serial port which is used to

connect to:

A programmer (usually a personal computer) running GE Fanuc PLC programming

software. The IC690ACC901 Miniconverter/cable kit is a convenient way to access

this port. See Appendix F for details.

The IC693PRG300 GE Fanuc Hand-Held Programmer. See Chapter 11 for details.

Other serial devices.

GFK-0356P

Chapter 5 CPUs

5-3

a43832

ÎÎÎÎ

RS-485

COMPATIBLE

SERIAL PORT

Figure 5-3. CPU Serial Port Connector on Power Supply

This serial port is RS-485 compatible, and uses the GE Fanuc SNP (Series Ninety

Protocol) protocol (slave only). Break-Free SNP became the default protocol on all

serial ports on the Series 90-30 CPUs, starting with Firmware Release 9.00 for CPUs

350 - 364, and Firmware Release 8.20 for CPUs 311 - 341. BreakFree SNP is discussed

in a later section of this chapter.

The serial port connector is only functional in a power supply that is installed in a

baseplate that also contains the CPU. It is not functional on a power supply that is

installed in an expansion or remote baseplate.

Any device connected to the serial port that uses +5 VDC power from the Series

90-30 power supply must be included in the calculation for maximum power

consumption (see the heading “Power Supply Loading Calculations” in Chapter 12).

All Series 90-30 CPUs have this serial port arrangement. The 351, 352, and 363 CPUs

have additional serial ports, described in a later section of this chapter.

Caution

Care must be taken that common mode voltage specifications are met

for connections to this serial port. Common mode conditions that

exceed those specified will result in errors in transmission and/or

damage to Series 90 PLC components. Common mode specifications

are discussed in Appendix C. When the common mode voltage

specification is exceeded, a port isolator such as the GE Fanuc

IC690ACC903 must be used. See Appendix G for details on this port

isolator.

Memor y Volatility

The term volatility refers to the issue of whether or not a certain memory type retains or

loses its contents (data) when power is removed from it.

Volatile memory - memory that loses its contents when power is removed. RAM

memory is inherently volatile. Therefore, when the PLC is turned off, a backup

battery is necessary if data loss in RAM memory is to be prevented.

5-4

Series 90-30 PLC Installation and Hardware Manual - October 1999

GFK-0356P

Non-volatile memory - memory that retains its contents when power is removed.

The various types of PROM (Programmable Read-Only Memory) memory are

non-volatile.

RAM Memory

Every Series 90-30 CPU uses RAM memory for its ”working memory.” The RAM chips

used are of the CMOS type. CMOS RAM is an acronym for Complimentary Metal-Oxide

Semiconductor, Random Access Memory. CMOS RAM is a relatively fast, low power

memory that can be easily examined (read) and changed (written to).

In the embedded CPU models, RAM memory is mounted on the backplane board. In

the modular CPU models, RAM memory is mounted inside the CPU module. A backup

battery is usually used to preserve the contents of RAM memory when power is off.

RAM Memory Backup/Backup Battery Information

Please see Chapter 6 for the following information:

RAM memory backup recommendations.

Backup battery information such as estimated life, replacing, determining

battery age using date codes, etc.

Running without a backup battery.

Low battery warning methods.

Programmable Read- Only Memory (PROM) Types

There are three types of PROM devices used in Series 90-30 CPUs:

EPROM: An acronym for Erasable Programmable Read-Only Memory. It is a plug-in

integrated circuit memory device that can be erased with an ultraviolet light. EPROMs

can be read when installed in the PLC, however in order to write new data to them, they

must be removed from the PLC and written to using an external PROM burning device.

EEPROM: An acronym for Electrically Erasable Programmable Read-Only Memory. It

is a plug-in integrated circuit memory device that can be erased and written to while

installed in the PLC.

Flash Memory: A variation of the EEPROM type memory. It also is an integrated

circuit device that can be erased and written to while installed in the PLC. One

advantage of CPUs having flash memory storage of firmware, is that firmware can be

updated by writing from a Personal Computer through a PLC serial port to flash

memory. No modules have to be removed for flash firmware upgrade.

Uses of PROM devices in the 90-30 CPUs

PROM-type devices are used in two ways in the 90-30 CPUs:

To store CPU firmware

To store user data, which consists of program, configuration, and register data.

The following table shows the types of PROM devices each CPU uses.

GFK-0356P

Chapter 5 CPUs

5-5

CPU Firmware and PROM Configurations

CPU Firmware and PROM Table

Firmware

EPROM

EEPROM

Flash

CPU

(standard)

(for user memory)

CPU311

EPROM

Optional

N/A

CPU313

EPROM

Optional

N/A

CPU323

EPROM

Optional

N/A

CPU331

EPROM

Optional

N/A

CPU340

EPROM

N/A

Optional

CPU341

EPROM

*Optional

* Optional

*Optional

CPU350

Flash

N/A

Standard

CPU351

Flash

N/A

Standard

CPU352

Flash

N/A

Standard

CPU360

Flash

N/A

Standard

CPU363

Flash

N/A

Standard

CPU364

Flash

N/A

Standard

* Early versions of the CPU341 support optional EPROM and optional

EEPROM only. Starting with hardware version IC693CPU341-J and

Firmware version 4.61, only optional Flash is supported.

CPU Firmware

The CPU firmware contains the basic operating instructions for the PLC. Firmware is

developed by a GE Fanuc product engineering group. It is stored in either EPROM or

Flash memory, depending on the particular CPU.

CPU Firmware Upgrade (Update)

From time to time, new firmware is released. A new firmware version may contain

support for new features or improvements to existing features. Once a new version of

CPU firmware is released, all new CPU modules will be sold with that version. The

Technical Support section of the GE Fanuc Web site lists CPU revision histories, matching

version numbers to associated features. See Chapter 13 for information on the GE Fanuc

Web site. Users who could benefit from a new firmware release may choose to upgrade

their CPU by installing new firmware. Upgrades come in two formats, depending on

the type of CPU to be upgraded. The ”CPU Firmware and PROM Configuration” table

in this chapter shows which type of firmware storage device each CPU has. The two

types are:

EPROM - For CPUs with firmware stored in EPROM, the upgrade is done by

replacing the CPU’s EPROM chips(s). The upgrade kit contains new EPROM

chip(s), update labels, and installation instructions. To upgrade the EPROM in an

embedded CPU system, the module in slot 1 must be unplugged to gain access to

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the PROM socket on the baseplate. In the case of a modular CPU, the CPU must be

unplugged and disassembled.

Flash - For CPUs with firmware stored in Flash, the upgrade is done by copying a

new firmware file to the CPU’s Flash memory. An upgrade kit may be purchased

from GE Fanuc. The upgrade kit contains the necessary files, update labels, and

instructions. This method does not require disassembling the module. The file

downloading is done either through the port on the power supply, or through a port

on the front of the CPU module (if it has one). The applicable method will be

documented in your upgrade kit instructions. Downloadable firmware upgrade

files are also found in the Technical Support area of the GE Fanuc Web site. See

Chapter 13 for Web site information.

To order an upgrade kit, write down the full catalog number of your module from the

module identification label on the side of the module, determine your current firmware

revision level, then call your PLC distributor. If you are not sure what firmware version

you currently have, see the heading on the next page “Determining CPU Revision

Levels (Versions).”

Flash Firmware Upgrade Procedure

The operating system firmware is updated by connecting a PC compatible computer to

the applicable PLC serial port and running the PC Loader software included with the

firmware floppy disk.

The computer used for this task should be an IBM AT compatible or better PC with a

minimum 640K of RAM, one 3.5” or high density 5.25” floppy drive, MS-DOS version 3.3

or later, a hard drive, and an RS-232 serial port. In addition, a miniconverter/serial cable

is required. The following miniconverter/serial cable kit is available:

IC690ACC901

Miniconverter Kit (RS-232/RS-485) with cable and 9-pin to

25-pin adapter. (This product is documented in Appendix F.)

Determining CPU Revision Levels (Versions)

If you plan to make changes to your system, you will need to know if your CPU can

support those changes. The features and capabilities of your CPU are determined by its

revision levels (hardware and firmware). This section discusses methods that you can

use to determine your CPU’s revision levels and associated features and capabilities.

Direct Methods

Obtain the information from the Important Product Information (IPI) sheet that

came with your CPU. However, if your CPU firmware has been upgraded, the IPI

will not indicate the current revision level.

The surest way to determine a CPU’s firmware revision level is to read it from the

CPU by using your programmer. Your programmer must be connected to the PLC

and be in Online or Monitor mode, and the PLC must be powered up. For example,

on the Logicmaster ”PLC STATUS and CONTROL” screen is an item called

”SOFTWARE REVISION.” The data displayed in that field (such as 6.04) is the

firmware revision level. See the Logicmaster 90-30 Programming Software User’s

Manual, GFK-0466 (or the user ’s manual for the programming software you use), for

additional details.

GFK-0356P

Chapter 5 CPUs

5-7

Indirect Method

Check the catalog number printed on the module identification label on the side of

the module. On all Series 90-30 modules, this catalog number indicates the module’s

revision level(s). For some CPUs, the catalog number contains a single letter at the

end to indicate the CPU’s overall revision level. For example,

IC693CPU341-J

This tells us that the module has a revision level J. Later CPU modules began to be

produced with two revision letters, such as:

IC693CPU351-EK

The first letter stands for the hardware revision level and the second for the

firmware revision level.

These letters can be cross-referenced to the firmware version. A revison history list

for Series 90-30 products, including CPUs, can be found in the GE Fanuc web site

technical support area (www.gefanuc.com/support/ ) that cross-references revision

letters, firmware versions, and related features. Also, if you have access to the

progression of IPIs that were issued for the particular CPU (these are available on

the GE Fanuc PLC InfoLink CD-ROM) you can find the desired cross-reference. Of

course, you can also contact your distributor or GE Fanuc for help.

If your firmware has been upgraded in the past, a small label that comes in the

upgrade kit should be attached to the side of the module next to the module

identification label to indicate the current firmware revision level. However, the

label could have been forgotten; so to be sure, you may want to read the

information from the CPU with a programmer as described in the “Direct Method”

above. On models with EPROM firmware, the firmware revision level will also be

printed on the EPROM.

EPROM and EEPROM User Program Storage Options

The Model 311, 313, 323, 331, and an earlier version of the Model 341 CPUs have a User

PROMoption for storing user application programs, register data, and configuration

data in non-volatile memory. Application programs are usually developed in a CPU’s

battery-backed RAM memory and executed from this RAM memory. But, if additional

program integrity, or operation of the PLC without a battery is desired, an optional

EEPROM or EPROM can be installed in a spare socket (labeled PROGRAM PROM) on the

embedded CPU baseplates or in a socket inside the Model 331 CPU module (and inside the

early versions of Model 341 CPU prior to hardware version IC693CPU341-J and firmware

release 4.61). The Model 331 CPU module (and the early versions of Model 341) has a

jumper labeled JP1 located next to the EEPROM/EPROM socket to allow you to select either

EEPROM or EPROM. These jumper positions are shown below.

Jumper

Selects

3 - 2

EEPROM

2 - 1

EPROM

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Comparing EPROM and EEPROM Features

For one-time applications, an EEPROM is the more practical of the two. It can be created

in the PLC itself and doesn’t require any additional outside equipment. An EPROM is

not as convenient to create. It must be created outside the PLC using an EPROM burner.

However, an EPROM is less expensive than an EEPROM. So, if you need to reproduce

multiple copies of a program to use on a large number of identical controls, it may be

cost effective to use EPROMs, especially if you already have an EPROM burner.

Procedure for Creating an EPROM

These are the steps for creating an EPROM or multiple EPROMs:

Install an EEPROM in the PROM socket of the PLC you will use to develop

the application program.

Develop and debug the program in RAM memory, then write it to the

EEPROM.

Remove the EEPROM from the PLC and install it in the EPROM burner as a

master to make one or more EPROMs.

Install the blank EPROM in the EPROM burner and copy the program on

the EEPROM to the blank EPROM.

Install the EPROM in the PLC’s PROM socket, then copy its contents into

RAM memory. The EPROM then serves as an on-board backup to RAM

memory.

Note: Your CPU can be configured to load the the application program stored in the PROM

device automatically into RAM memory when the CPU is powered-up. See the heading

”Running Without a Memory Backup Battery” in Chapter 6 for details.

Caution

If PROM is configured (on the CPU configuration screen) as the

power-up program source and a PROM device is not present in the

PROM socket, or a blank PROM is in the socket, on a power-up cycle, a

blank program will be copied into the CPU’s RAM memory and the

program in RAM memory will be lost. Always keep a backup copy of

your current program files in case of an emergency.

EEPROM and EPROM memory devices are available from GE Fanuc. Catalog numbers

for these devices are listed in the following table.

Table 5-1. EPROM and EEPROM Catalog Numbers

GE Fanuc

Third Party Source

Catalog Number

Description

Part Number

Vendor Part Number

IC693ACC305 (Qty 4)

28C256 EEPROM, 350ns

44A725999-000

XICOR X28C256P

XICORX28C256P25

XICOR X28HC256P-15

IC693ACC306 (Qty 4)

32Kx8 UV EPROM, 150ns

44A723379-000

NEC PD27C256AD-15

Atmel AT27C256-15DC1

Toshiba TC57256AD-15

Hitachi HN27C256AG-15

AMD AM27C256-150DC

Intel

TD27C256A-1

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Chapter 5 CPUs

5-9

Flash Memory

The Model 340, 341 (later versions), 350, 351, 352, 360, 363, and 364 CPUs have Flash

memory for user program storage. (Note that versions of the Model 341 CPU prior to

firmware release 4.61 had EEPROM memory.) TheRead/Write/Verify process for user

programs is the same for Flash memory as it is for EEPROM operations. Flash memory

operations (Read, Write, or Verify) are accessed from the Program Utilities Function

menu or from another Program Utilities screen in the Logicmaster 90-30/20/Micro

programming software.

Series 90-30 CPU Capacities

The following table describes the maximum capacities and operating features for the Series

90-30 PLC CPU models. For State Logic CPUs, see the section “System Specifications for

Series 90-30 State Logic CPUs” in Chapter 9.

Table 5-2. Series 90-30 CPU Capacities

CPU

Speed,

Input

Output

User Program

Floating

Model

(MHz)

Processor

Points

Memory

Point

(Maximum)

Math

CPU311

80188

160 ¹

1K (Bytes)

6K (Bytes)

CPU313

80188

160 ¹

2K (Bytes)

12K (Bytes)

CPU323

80188

320 ²

2K (Bytes)

12K (Bytes)

CPU331

80188

512

4K (Bytes)

16K (Bytes)

CPU340

80C188XL

512

19.9K (Bytes)

32K (Bytes)

CPU341

80C188XL

512

19.9K (Bytes)

80K (Bytes)

CPU350

80386EX

2048

19.9K (Bytes)

32K (Bytes)

yes

CPU351

80386EX

2048

Note 3

Note 4

yes

CPU352

80386EX

2048

Note 3

Note 4

yes⁵

CPU360

80386EX

2048

Note 3

Note 4

yes

CPU363

80386EX

2048

Note 3

Note 4

yes

CPU364

80386EX

2048

Note 3

Note 4

yes

Maximum of 160 combined I + O points.

Maximum of 320 combined I + O points.

Configurable from 128 to 32,640 words, in 128 word increments.

Depends on assigned values for configurable word memory (%R, %AQ, %AI). Maximum is 240K Bytes.

CPU352 has hardware-based floating point math. Others CPUs have firmware-based floating point math.

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User Memory Addresses (References)

Data in the Series 90-30 PLC programs is referenced by its memory address. A reference

indicates the way that data is stored in the PLC. A reference specifies both a memory

type and a precise location (number) within that memory type. For example:

%I00001

specifies address 1 in input memory.

%R00256

specifies address 256 in register memory.

Difference Between a Memory Address and a Nickname

The % symbol is used to distinguish memory addresses from nicknames. For example,

%I17 (or %I000017) is a memory address. The similar term, I17 (it has no % sign), is

viewed by the PLC as a nickname and could be used with most memory addresses. For

example, if you had a motor in your plant called ”Infeed No. 17,” and it was commonly

referred to as ”I17” by the people in your plant, you might wish to use I17 as the

nickname for the output coil (%Q11) that turns on that motor. You are allowed to do so

because the PLC can distinguish between the nickname, I17 (your nickname for memory

address %Q11), and memory address %I17.

User Memory Reference Types

The user references referred to in the following tables are explained in the Series 90-30

PLC CPU Instruction Set Reference Manual, GFK-0467.

Table 5-3. Range and Size of User References for CPU Models 311-341

Model 311/313/323

Model 331/340/341

Reference(Memory) Type

ReferenceRange

Size

ReferenceRange

Size

User program logic

Not applicable

6K bytes

Not applicable

CPU331: 16K bytes

CPU340: 32K bytes

CPU341: 80K bytes

Discrete inputs

%I0001 - %I0320

512 bits

%I0001 - %I0512

512 bits

Discrete outputs

%Q0001 - %Q0320

512 bits

%Q0001 - %Q0512

512 bits

Discreteglobals

%G0001 - %G1280

1280 bits

%G0001 - %G1280

1280 bits

Internal coils

%M0001 - %M1024

1024 bits

%M0001 - %M1024

1024 Bits

Temporary coils

%T0001 - %T0256

256 bits

%T0001 - %T0256

256 bits

System status references

%S0001 - %S0032

32 bits

%S0001 - %S0032

32 bits

%SA001 - %SA032

32 bits

%SA0001 - %SA0032

32 bits

%SB001 - %SB032

32 bits

%SB0001 - %SB0032

32 bits

%SC001 - %SC032

32 bits

%SC0001 - %SC0032

32 bits

System register references

%R0001 - %R0512 (311)

512 words

%R0001 - %R2048

2K words (331)

%R0001 - %R1024 (313)

1024words

%R0001 - %R9999

9999words(340/341)

Analog inputs

%AI001 - %AI064

64 words

%AI0001 - %AI0128

128 words (331)

%AI0001 - %AI1024

1024words(340/341)

Analog outputs

%AQ001 - %AQ032

32 words

%AQ001 - %AQ064

64 words (331)

%AQ001 - %AQ256

256words(340/341)

System registers

%SR001 - %SR016

16 words

%SR001 - %SR016

16 words

160 physical I/O maximum with 16 point modules installed; 320 maximum with 32 point modules installed

May be viewed only with a Hand-Held Programmer (see the Hand-Held Programmer User’s Manual, GFK-0402) ; may not be

referenced in a user’s logic program.

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Chapter 5 CPUs

5-11

Table 5-4. Range and Size of User References for CPU Models 350 through 364

Model 350/351/352/360/363/364 CPU

Reference

Type

Reference Range

Size

Maximum User memory*

Notapplicable

240K Bytes, configurable

(CPU350: 32K Bytes, fixed)

Discrete inputs

%I0001 - %I2048

2048 bits

Discreteoutputs

%Q0001 - %Q2048

2048 bits

Discrete globals

%G0001 - %G1280

1280 bits

Internal coils

%M0001 - %M4096

4096 bits

Temporary coils

%T0001 - %T0256

256 bits

System status references

%S0001 - %S0032

32 bits

%SA001 - %SA032

32 bits

%SB001 - %SB032

32 bits

%SC001 - %SC032

32 bits

System register references

%R0001 - %R32640*

128 - 32,640 words , configurable.

(CPU350: 9999 words, fixed,)

Analoginputs

%AI001-%AI32640*

128 - 32,640 words , configurable.

(CPU350: 2048 words, fixed)

Analogoutputs

%AQ001-%AQ32640*

128 - 32,640 words,configurable.

(CPU350: 512 words, fixed)

System registers

%SR001 - %SR028

28 words

May be viewed only with a Hand-Held Programmer (see the Hand-Held Programmer User’s Manual,

GFK-0402) ; may not be referenced in a user’s logic program.

* Depends on user-defined value(s) of configurable memory.

Application Program Compatibility

Programs that have been developed on Series 90-30 CPUs 311-341 will automatically

be translated by the programming software when used on CPUs 350-364. Programs

created or translated for CPUs 350-364 will automatically be translated when used with

CPUs 311-341; however, be aware that some CPUs support features, such as

floating-point math or larger memory sizes, that are not supported by other CPUs. In

those cases, attempting to load a program to a CPU not supporting one or more of the

programmed or configured features will result in an error. However, in some cases it

may be possible to edit the program and configuration to make them compatible with

the targeted CPU.

CPU Time-of-Day (TOD) Clock Accuracy

The accuracy of the Series 90-30 time-of-day clock is Ç 9 seconds per day across the rated

operating temperature range of 0-60°C. The accuracy is relatively stable at any fixed

temperature. For applications that require greater accuracy, the following suggestions

are furnished:

For an installation where the temperature of the CPU is stable, measure the amount

of time drift for a 24 hour period, then program a “correction” factor into the ladder

program to add or subtract seconds periodically to keep the CPU time accurate. The

instruction to use in this case is Service Request #7, “Change/ReadTime-of-Day

Clock.” At the appropriate time, a Service Request would read the TOD clock, an

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ADD instruction would add the correction value to it, and another Service Request

would write the new value to the TOD clock. A possible drawback to this method is

that if you replace your CPU you will have to determine a new correction factor.

Also, this method is affected by temperature changes, so its success is based on

holding the CPU’s ambient temperature stable.

If more accuracy is needed, the PLC could be interfaced to a third party solution

such as a radio link or Global Positioning System (GPS) satellite system.

Break-Free SNP Protocol

Break-Free SNP became the default protocol on all serial ports on the Series 90-30 CPUs,

starting with Firmware Release 9.00 for CPUs 350 - 364, and Firmware Release 8.20 for

CPUs 311 - 341. The Break-Free feature makes the protocol compatible with a wider

variety of modems. This feature is compatible with existing SNP master units such as

computers running PLC programming software, or PCM modules. In a few

applicaitons, primarily where a combination of multi-drop SNP communications and

very short PLC sweep times are used, users may desire, for performance reasons, to

disable Break-Free SNP. Break-Free SNP can be disabled and re-enabled via

Communications Request instructions. The Series 90 PLC Serial Communications User ’s

Manual, GFK-0582D (when available) will document these Communications Request

instructions. These instructions are currently detailed in Important Product Information

(IPI) publication number GFK-0810W.

350 - 364 CPUs

The 350-364 group of CPUs was developed to meet the needs of customers requiring

increased memory size, faster processing speed, and additional features not available on

the 311-341 CPUs.

Compatibility With Hand-Held Programmer (HHP) and Memory Card

The user program in CPUs 350-364 cannot be viewed or edited with the Series

90-30 Hand-Held Programmer (IC693PRG300). You must use one of the GE Fanuc

programming software packages to create or edit CPU 350-364 user programs.

The Series 90 Memory Card (used on the Hand-Held Programmer) is not supported

by CPUs 350-364.

The only operations supported by the HHP’s PROGRAM mode are writing to and

reading from the CPU’s flash memory.

Although the HHP’s CONFIG mode can be used to perform basic configuration of

these CPUs, it cannot handle specialized parameters such as those pertaining to the

embedded Ethernet Interface in the CPU364.

The HHP can be used to change the Time-of-Day Clock unless the Mem Protect

configuration parameter is set to Enabled and the keylock switch is in the ON

(Protect) position.

The HHP can be used to edit data values in %R registers.

The HHP can be used to invoke or clear overrides on these CPUs.

GFK-0356P

Chapter 5 CPUs

5-13

350 - 364 CPU Advanced Features

Advanced features of 350 - 364 CPUs

Feature

CPU350

CPU351

CPU352

CPU360

CPU363

CPU364

Memor y

32K

240K¹

fixed

Configurable

Serial Por ts

Floating-

Yes¹

Yes

Yes¹

Point Math

(Firmware)

(Hardware)

(Firmware)

Flash

Yes

Memor y

Key Switch

Yes

Sequential

Yes¹

Event

Recorder

Embedded

Yes¹

Ethernet

Interface

¹ Denotes features supported in CPU firmware release 9.0 and later.

Details of 350 - 364 CPU Advanced Features

Upgrading Older CPUs

Older versions of the CPU firmware do not support some of the features in the table

above (see table footnote). These features may be added to older 350 - 360 CPUs by

upgrading them to CPU firmware version 9.0 or later. (The 363 and 364 CPUs were

equipped with firmware version 9.0 when released as new products.) No hardware

changes are required for this upgrade. For more information on the subject of

upgrading, see the heading “CPU Firmware Upgrades” earlier in this chapter.

Memor y/Configurable Memory

Starting with CPU firmware version 9.0, the 351 - 364 CPUs have 240K of

user-configurable memory. The CPU350 has 32K of fixed memory. The configurable

memory feature lets you specify the amount of %R, %AI, and %AQ word memory.

Discrete memory (%I, %Q, %M, etc.) sizes are not configurable. Word memory can be

configured from 128 to 32,640 words in 128 word increments, which gives 255 possible

sizes. The amount of memory available for a user program depends on how much is

configured for word memory.

Note

Configurable Memory has limited support in Logicmaster Version 9.02

and later (limited to 16K %R words, 8K %AI words, and 8K %AQ

words), and full support in Control (Version 2.2 and later) and VersaPro

(all versions).

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Additional Serial Ports (CPU351, CPU352, CPU363)

Although all Series 90-30 CPUs have a serial port that is accessed through the connector

on the power supply, the CPU351, CPU352, and CPU363 each have two additional serial

ports. The connectors for these additional serial ports are mounted on the front of each

CPU. These two built-in serial ports eliminate the need for the CPU to access serial ports

across the PLC backplane, resulting in better system performance. These two ports

support the SNP/SNP-X master and slave protocols (see previous section “Break-Free

SNP Protocol”), RTU slave protocol (in Firmware Version 8.0 and later), and the Serial

I/O feature (in Firmware Version 8.0 and later) that lets you create a custom serial

output. Instructions on how to use these ports can be found in the Series 90 PLC Serial

Communications User’s Manual, GFK-0582C or later.

Floating-Point Math

All Series 90-30 CPUs can work with integer numbers. (The set of integer numbers

consists of all positive and negative whole numbers, including zero.) The floating-point

math feature enables a CPU to work with decimal numbers in addition to integer

numbers. It also provides trigonometric, logarithmic, exponential, and radian

conversion functions. Floating-point math is also referred to as “real number ” math. The

CPU352 has always had hardware-based floating-point math capabilities due to its

built-in math co-processor chip. Starting with CPU firmware release 9.0, all of the other

CPUs in the 350 - 364 CPU group were provided with firmware-based floating-point

math capability. Although there is a speed difference between the hardware-based

floating-point math of the CPU352 and the firmware-based type, this will not be

significant to many users. For applications where faster performance is important, the

CPU352 is the best choice. The floating-point math instructions are explained in the

Series 90-30 PLC CPU Instruction Set Reference Manual, GFK-0467K (the letter K is the

revision or version indicator) or later.

Flash Memory

All of the 350 - 364 CPUs have built-in Flash memory, which serves two purposes:

It provides non-volatile storage of the CPU firmware.

It gives you the option of storing program, configuration, and register data in

non-volatile Flash memory. Two ways of using this memory are: (1) to store an

on-board backup copy of user memory (although we still recommend that you keep

a separate backup copy of your complete program folder), and (2) for running in a

battery-less scheme. For details, please see Chapter 6.

Keyswitch

All 350 - 364 CPUs have a keyswitch; however, some versions of the CPU firmware do

not support all of the keyswitch features (see the section “Determining CPU Revision

Levels” earlier in this chapter). These differences are described in this section. Note that

the keyswitches on some of these CPUs are labeled ON/RUN and OFF/STOP and on

others are just labeled ON and OFF. Regardless of the labeling, all of these keyswitches

work as described below:

Flash Memory Protection: This standard, hard-wired feature can be used to prevent

Flash memory from being changed by unauthorized people (people without a key).

When the key switch is in the ON position, Flash memory cannot be changed

GFK-0356P

Chapter 5 CPUs

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