5. AUTOMATIC OPERATION
B-64693EN-1/01
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Fig. 5.1 (a)
When signal *SP is set to 0 during the execution of a block containing only the M, S, T, or B function,
signal STL is immediately set to 0, signal SPL is set to 1, and the CNC enters the feed hold state. If the
FIN signal is subsequently sent from the PMC, the CNC executes processing up until the end of the block
that has been halted. Upon the completion of that block, signal SPL is set to 0 (signal STL remains set to
0) and the CNC enters the automatic operation stop state.
(a) During threading
When signal *SP is set to 0 during threading, the CNC enters the feed hold state after executing a
non-threading block after the threading blocks.
In lathe system, when signal *SP is set to 0 during threading with the G92 command (threading
cycle), signal SPL is immediately set to 1 but operation continues up until the end of the retraction
block following threading. When signal *SP is set to 0 during threading with the G32 (M series:
G33) command, signal SPL is immediately set to 1 but operation continues until the end of a
non-threading block following the threading blocks. (Stopping feeding during threading is dangerous
because the amount of cutting will increase.)
(b) During tapping in a canned cycle
When signal *SP is set to 0 during tapping in a canned cycle (G84), signal SPL is immediately set to
1 but operation continues until the tool returns to the initial level or R point level after the
completion of tapping.
(c) When a macro instruction is being executed
Operation stops after the currently executing macro instruction has been completed.
Signal
Cycle start signal ST<Gn007.2>
[Classification] Input signal
[Function] Starts automatic operation.
[Operation] When signal ST is set to 1 then 0 in memory (MEM) mode, DNC operation mode (RMT)
or manual data input (MDI) mode, the CNC enters the cycle start state and starts
operation.
MEM, RMT, or MDI mode
. . . .
Start
Signal ST "1"
"0"
Automatic operation
32 msec
or more
Fig. 5.1 (b)