
B-63783EN-1/01 5.AUTOMATIC OPERATION
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- Halt of automatic operation (feed hold)
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.
1 M, S, T, B block
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.
2 Thread cutting
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. If, however, the *SP signal remains set to 0,
automatic operation is held at the start point of a block for which
threading is not specified.
3 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.
4 Macro instruction
Operation stops after the currently executing macro instruction
has been completed.
5 When a macro instruction sets a system variable for disabling feed
hold
The automatic operation hold state is set when the block
immediately after the system variable for disabling feed hold is
cleared has been executed. If the *SP signal remains set to 0,
however, the automatic operation hold state is set at the start point
of the block.