B–63503EN–1/01
5. AUTOMATIC OPERATION
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When the feed hold signal *SP is set to 0 during automatic operation, the
CNC enters the feed hold state and stops operation. At the same time,
cycle start lamp signal STL is set to 0 and feed hold lamp signal SPL is
set to 1. Re–setting signal *SP to 1 in itself will not restart automatic
operation. To restart automatic operation, first set signal *SP to 1, then
set signal ST to 1 and then to 0.
STL
ST
SPL
ST
STL
*SP *SP
This signal is ignored when the
feed hold signal is set to 0.
ST
Fig. 5.1 Time chart for automatic operation
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.
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 cannec cycle (G84)
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.
D Halt of automatic
operation (feed hold)