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FANUC Series 0i-MODEL F Plus. CONNECTION MANUAL (FUNCTION) - page 137

6. INTERPOLATION FUNCTION

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The command position (R) can be used.

Repeated specification in polygon synchronization mode is allowed.

For polygon turning, see also the section about polygon turning.

Mode command and command value change

The G51.2 command is modal. Once specified, the P, Q, and R values stay unchanged until another G51.2
is issued to change them or polygon synchronized mode is released.

In polygon synchronized mode, the S command for the master axis controls the polygon synchronization
axis so that it rotates at a speed of S

Q/P and its phase is R.

Release command

G50.2 command releases the polygon synchronization mode. This mode is released also when:
<1> Reset and emergency stop

(Setting bit 0 (RPL) of parameter No.7603 to 1 prevents polygon synchronization mode from being
released.)

<2> Power is turning off.
<3> An alarm condition occurs in the spindle control unit, and the serial spindle control unit stops in an

emergency on the PMC signals *ESPA<Gn071.1> and *ESPB<Gn075.1>.

<4> Alarm PS0218, PS0219, PS0221, PS0314, or PS5018 occurs

NOTE

1 G51.2 and G50.2 must be issued separately from other commands.
2 In a G51.2 issued to enter the polygon synchronization mode, R is omissible, but

P and Q are required.

3 When G51.2 is specified to change the P, Q, and R settings during the polygon

synchronization mode, R can be specified independently. When P and Q are
changed, however, be sure to specify both P and Q.

4 When bit 0 (RPL) of parameter No.7603 = 0 regardless of the setting of bit 6

(CLR) of parameter No.3402, a reset issues G50.2 (polygon synchronization
release mode). When bit 0 (RPL) of parameter No. 7603 = 1, a reset does not
clear G51.2 (polygon synchronization mode) in polygon synchronization mode.

5 The following functions must be commanded with polygon turning cancel mode.

-  Inch/metric conversion
-  AI contour control
-  Tilted working plane indexing
-

Flexible path axis assignment

Spindle operation during the polygon synchronization mode with two spindles

When the start of polygon synchronization is specified by G51.2, the polygon synchronization axis speed
is adjusted to Q/P times the master axis speed based on spindle speed command value for the master axis
and then phase matching is performed.

Master axis

Polygon
synchronization axis

M03S100;
When G51.2P1Q1R90.; is specified
Spindle state during polygon
synchronization

Master axis speed = S (=100 (min

-1

) )

polygon synchronization axis speed

= S

Q / P

= 100

1 / 1

= 100 (min

-1

)

Phase R = 90 (deg)

Forward rotation
100 (min

-1

)

Forward rotation
100 (min

-1

)

Phase R=90 (deg)

Fig. 6.9.2 (a)

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6. INTERPOLATION FUNCTION

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When the spindle is accelerated or decelerated or when phase matching is being performed, the
synchronization state of rotation ratio of P to Q is not guaranteed. Therefore, in an actual cutting block
command, control the spindle speed arrival signal SAR<Gn029.4> after checking that the signal state of
the polygon spindle speed arrival signal for polygon turning with two spindles PSAR<Fn063.2> is 1 or
take sufficient wait time in the program.

Each time any of the following changes is made during polygon synchronization, control the speed and
then perform phase matching.
1)

The spindle speed command for the master axis is changed.

The speed ratio commands P and Q are specified by G51.2 again.

The phase command value R is specified by G51.2 again.

The polygon spindle stop signal *PLSST

<Gn038.0>

is changed from “0” to “1”.

How to specify the spindle speed for the master axis (multi-spindle control or spindle output control by
PMC) does not change regardless of whether polygon synchronization mode or normal operation is
selected. Spindle speed specification for the polygon synchronization axis is disabled in polygon
synchronization mode.

If the speed of the polygon synchronization axis (S

Q / P(min

-1

): where S is the master axis speed)

exceeds the clamp speed set in parameter No. 7621 after the command is executed, an alarm (PS5018)
occurs and the polygon synchronization state is cleared.

The diagnostic display bit 2 (QCL) of No. 471 can be used to check whether the clamp speed is exceeded
after the command is executed.

PMC sequence

Although this function is based on the G-code system, it is necessary to add or change PMC ladder
sequences because control on the part of the spindle is also required.
(See the description of the PMC sequence in this section.)

6. INTERPOLATION FUNCTION

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Example of polygon turning with two spindles

This example of polygon turning with two spindles produces a square using single-edged cutting tools
(for roughing and finishing).

.
Mxy;
Txxyy;
G00 X100. Z20. M03 S1000 ;
.
G51.2 P1 Q2 R0 ;
.
.
.
.
.
.
.
.
.
G01 X80. F10. ;
.
G04 P4000 ;
.
G00 X100. ;
.
G51.2 R180.;
.
[Repeat steps 4, 5, and 6.]
.
G50.2 ;
Myz;
Tyyzz;
.
S2000;
G51.2 P1 Q2 R0 ;
.
.
[Repeat steps 4, 5, and 6.]
.
[Repeat step 7.]
.
[Repeat steps 4, 5, and 6.]
.
G50.2 ;
.
.
.
M05S0;
.
.

Mount a roughing tool on the polygon synchronization axis (tool
rotation axis).
Start rotating the workpiece (with the master axis at 1000 (min

-1

))

Start rotating the tool.
In the PMC ladder, the polygon synchronization axis is energized
by polygon synchronization under way signal PSYC<Fn063.7>.
After acceleration to 2000 (min

-1

) is performed as the polygon

synchronization axis, positioning is performed. The phase is 0.
In the PMC ladder, the spindle speed arrival signal
SAR<Gn029.4> is controlled based on the polygon spindle speed
arrival signal PSAR<Fn063.2> during the polygon
synchronization mode.

Starts cutting along the X-axis after SAR<Gn029.4> becomes
logical 1 in signal control at step 3.
Polygonal turning (roughing 1)

Retract the tool along the X-axis.

Change the phase by 180 degrees.

Polygonal turning (roughing 2)

Release the polygon synchronization mode. Change to a finishing
tool.

Change the spindle speed for finishing
Start rotating the tool. (master axis at 2000 min

-1

and polygon

synchronization axis at 4000 min

-1

with a phase difference of 0).

Polygonal turning (finishing 1)

Change the phase by 180 degrees.

Polygonal turning (finishing 2)

Release the polygon synchronization mode.
The polygon synchronization axis (tool rotation axis) stops.
The master axis rotates at 2000 (min

-1

The master axis stops.

Step 1.

Step 2.

Step 3.

Step 4.

Step 5.

Step 6.

Step 7.

Step 8.

Step 9.

Step 10.

Step 11.

Step 12.

Step 13.

Step 14.

Step 15.

Diagnosis data

For polygon turning with two spindles, the following information is displayed on the diagnosis screen.

470

SC0

LGE

SCF

PSC

PEN

PSU

SPL

Polygon turning with two spindles
Indication of information about the polygon synchronization mode

SPL Polygon synchronization with two spindles under way

PSU Polygon synchronization mode with two spindles being activated

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6. INTERPOLATION FUNCTION

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NOTE

If only PSU becomes 1, but no change occurs, and the program
stops in a block containing a G51.2 command, the speed of an
spindle does not reach the targeted polygon synchronization speed,
for example, because bit 7 (PST) of parameter No. 7603 = 0 keeps
the spindle from being energized.

PEN Polygon synchronization mode with two spindles released

PSC Spindle speed being changed during polygon synchronization mode with two spindles

SCF Spindle speed has been changed during polygon synchronization mode with two spindles

LGE The loop gain is different between the spindles during polygon synchronization mode

with two spindles.

NOTE

When the speed is changed during polygon synchronization mode,
LGE is set to 1 if the spindle synchronization control loop gain used
by the serial spindle control unit is different between the master
spindle and polygon synchronization axis.

Diagnosis display indicates the loop gain because this function
requires that both spindles be controlled with the same loop gain.
However, no alarm is issued even if the loop gain is different
between the spindles.

(For the serial spindle control unit, the parameters used are
changed according to the state of the CTH1 and CTH2 signals.)

SC0 Actual speed command is 0 during polygon synchronization mode with two spindles.

NOTE

Signal SC0 is not a value specified by the program. It is set to 1
under any of the following conditions:
1. When the S command value is adjusted according to the signals

related to spindle control, SSTP<Gn029.6> and SOV0-
SOV7<Gn030> and the signal related to multi-spindle control
<Gn027>, the result is 0.

2. The S command value is smaller than the spindle control

resolution (the result of multiplying the S command value by a
value of 4095/(maximum spindle speed) is less than 1).

The S command value is specified by SIND control <Gn032,
Gn033>, and it is 0.

If SC0 = 1, the spindle speed becomes 0 and bit 0 (SCU) of
diagnosis data No. 471 becomes 1. In this case, the polygon
synchronization rotation ratio is impractical, but alarm PS5018 does
not occurs, because it is regarded as the result of the command.

If the following status is indicated during the polygon synchronization mode, there are no abnormalities.

470

471

NPQ

PQE

QMS

NSP

SUO

QCL

SCU

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Polygon turning with two spindles
Indication of causes for alarms PS5018, PS0314, and PS0218

#0 to #3 Causes for alarm PS5018

Alarm PS5018 is cleared by a reset, but the indication of its causes remains until the
causes are cleared or the polygon synchronization mode is released.

SCU The specified speed is too low during polygon synchronization mode with two spindles.

(The unit of speed calculated internally becomes 0.)

NOTE

SCU becomes 1 also when the specified spindle speed is 0 (bit
7(SC0) of diagnosis data No.470 is 1). In this case, however, alarm
PS5018 is not issued (because the command is 0). When bit
7(SC0) of diagnosis data No.470 is 0 and bit 0(SCU) of diagnosis
data No.471 is 1, alarm PS5018 occurs. Normally this does not
occur with speed at which the spindle can rotate.

QCL The polygon synchronization axis is clamped.

NOTE

QCL becomes 1, when the polygon synchronization axis receives a
command with a polygon synchronization speed that is higher than
the value specified in parameter No. 7621 and is clamped at that
speed.

SUO The specified speed is too high during the polygon synchronization mode with two

spindles.
(It is clamped to the upper limit calculated internally.)

NOTE

SUO occurs, if a result of (speed specified for the master
spindle)/(value specified at P) is higher than 59998. In other words,
the master spindle must rotate at a speed lower than 59998 min

-1

assuming P = 1.

#4 Causes for alarm PS0314

When alarm PS0314 occurs, the polygon synchronization mode is released, but the
indication of its causes remains until the alarm PS0314 is cleared by a reset.

NSP A spindle necessary for control is not connected.

(For example, there is not a serial spindle or the second spindle.)
The axis settings for polygon turning are not correct.

#5 to #7 Causes for alarm PS0218

When alarm PS0218 occurs, the polygon synchronization mode is released, but the
indication of its causes remains until the alarm PS0218 is cleared by a reset.

QMS When bit 1 (QDR) of parameter No. 7603 = 1, a negative value is specified at Q.

PQE In a G51.2, either P or Q has a value out of the specifiable range.

Or, P and Q are not specified as a pair.

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NPQ In a G51.2, R is specified when P and Q have not been specified at all, or none of P, Q,

and R has been specified.

Indication of values specified during the polygon synchronization mode with two spindles

474

Rotation ratio for the master axis during the polygon synchronization mode with two spindles (P

command value)

This indication is the current rotation ratio (P command value) of the master axis during
the polygon synchronization mode with two spindles.

475

Rotation ratio for the polygon synchronization axis during the polygon synchronization mode with two

spindles (Q command value)

This indication is the current rotation ratio (Q command value) of the polygon
synchronization axis during the polygon synchronization mode with two spindles.

476

Phase difference between the two spindles under polygon synchronization control with two spindles(R

command value)

This indication is the current phase value (R command value) specified during the
polygon synchronization mode with two spindles. (The increment system for the
reference axis used.)

However, if bit 5 (RDG) of parameter No. 7603 = 1, the indication is the amount of
shifting specified for the serial spindle (number of pulses after conversion is performed
assuming 360 degrees = 4096 pulses).
Indication of the actual speed of each spindle during the polygon synchronization mode
with two spindles

477

Actual master axis speed (min

-1

) during the polygon synchronization mode with two spindles

This indication is the actual speed of the master axis during the polygon synchronization
mode with two spindles.

478

Actual polygon synchronization axis speed (min

-1

) during the polygon synchronization mode with two

spindles

This indication is the actual speed of the polygon synchronization axis during the polygon
synchronization mode with two spindles.

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Spindle tuning screen

During the polygon synchronization mode with two spindles, information for the spindle synchronization
control mode is displayed.

The following information is displayed on the spindle tuning screen.
”Positional deviation” indicates the positional deviation of the spindle currently being displayed.
”Synchronous deviation” indicates the absolute value of a synchronization error in polygon
synchronization during polygon turning with two spindles. The synchronization error value is displayed
on the spindle tuning screen for the spindle used as the polygon synchronization axis.
For details, please refer to Spindle tuning screen of MAINTENANCE MANUAL (B-64695EN).

Signal

Polygon spindle stop signal *PLSST<Gn038.0>

[Classification]

Input

signal

[Function] This function is enabled when bit 7 (PST) of parameter No. 7603 is set to 1. This signal is

used to stop the spindle during the polygon synchronization mode with two spindles.
0 = polygon spindle stop
1 = polygon spindle operable
During the polygon synchronous mode with two spindles, the rotation of the spindle is
controlled with a position loop created.
The spindle is rotated by move command pulses based on the polygon synchronization
speed.
When the activated spindle is turned off by the spindle stop (for example, M05) command,
move command pulses are generated even when activation is off unless the spindle speed
command is set to 0 using the spindle stop signal *SSTP<Gn029.6> or the like, some
error pulses being accumulated. When activation is turned on at this time, the spindle may
rotates at high speed because the accumulated error pulses are moved at a time.
This signal can be used to stop the delivery to the polygon spindle only during the
polygon synchronous mode with two spindles. The signal must be controlled according to
the activation status (on/off) of the polygon spindle.

For details on usage, see the section that describes PMC sequences.

Polygon synchronization under way signal PSYN<Fn063.7>

[Classification]

Output

signal

[Function] Informs the PMC that the system is in the polygon synchronization mode.

[Output cond.] The polygon synchronization mode command (G51.2) sets this signal to logical “1”. It

stays at 1 as long as the system is in the polygon synchronization mode. It is turned to 0
when the polygon synchronization mode is cleared (G50.2 command or a reset). It stays
at 0 when the system is not in the polygon synchronization mode.

NOTE

The same address is used for this signal in both polygon turning
(using the servo axis) and the polygon turning with two spindles.

Motor speed

Spindle speed

Positional deviation S1

Positional deviation S2

Synchronous deviation

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6. INTERPOLATION FUNCTION

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Polygon spindle speed arrival signal PSAR<Fn063.2>

[Classification] Output signal

[Function] Informs the PMC that the spindle has reached its constant-speed for polygon

synchronization during polygon turning with two spindles.

[Output cond.] During polygon synchronization mode with two spindles, whether the constant-speed is

reached for polygon synchronization is output as shown below:
0 = not reached (during phase change or acceleration/deceleration under way)
1 = reached
During the polygon synchronization mode, this signal becomes logical 1 when the speed
of each spindle reaches the acceptable level specified in parameter No. 7631 and remains
there for a period specified in parameter No. 7632.
If the speed of either spindle goes off the acceptable level, or a change is made to the S
command, the signal returns to logical “0” and begins monitoring the above condition.
When this signal is “0”, the specified speed ratio and phase are not guaranteed for
polygon turning. If the signal is confirmed before actual turning is started, however, the
operation is more efficient than when a dwell command (like G04) is used to allow wait
time.

Polygon master axis not arrival signal PSE1<Fn063.0>
Polygon synchronization axis not arrival signal PSE2<Fn063.1>

[Classification]

Output

signal

[Function] Informs the PMC whether the actual speed of each spindle has reached the specified

speed during polygon turning mode with two spindles.

[Output cond.] During the polygon synchronization mode with two spindles, whether each spindle has

reached the polygon synchronization speed is output as shown below:
0 = reached
1 = not reached (during phase change or acceleration/deceleration under way)
During the polygon synchronization mode with two spindles, this signal becomes logical
1 when the speed of master axis and polygon synchronization axis does not reach the
acceptable level specified in parameter No. 7631.

Signal address

#7 #6 #5 #4 #3 #2 #1 #0

Gn038

*PLSST

#7 #6 #5 #4 #3 #2 #1 #0

Fn063

PSYN

PSAR

PSE2

PSE1

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