
B–62073E–1/042. INTERFACE BETWEEN CNC AND PMC–NA OR NB
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(c) External read/punch stop signal EXSTP
[Classification]
Input signal
[Function] Forcibly terminates program registration, collation, and output being performed in back-
ground editing.
[Operation] When this signal goes high, the control unit functions as described below.
1 When program registration, collation, or output is performed in background editing, the
control unit terminates this operation immediately.
2 In other cases, including program registration, collation, and output in the foreground,
this signal is invalid.
[Use] Background editing can be performed in parallel with foreground program execution. The
program execution may result in a reset (reset due to M02, M30, etc.). Generally, it is not de-
sirable that background editing be affected by such a reset. So reset is made invalid for back-
ground editing.
When the operator performs program registration, collation, or output with the MDI panel, the
operator can forcibly terminate the operation by pressing a key (soft key) on the MDI panel,
regardless of whether the operation is being performed in foreground or background editing.
When registration or output is performed in background editing, using an external signal
(EXRD, EXPUN), however, there is no other means to forcibly terminates these operations.
So the EXSTP signal must be used.
When planning to perform background registration and output using the external read/punch
signal, provide a button or switch to turn on and off the signal in order to reset the system is
the event a problem occurs.
NOTE In addition to registration and output started by the external read start signal and external punch
start signal, the signal can stop any background registration, collation, and output, even when
the operator started background registration, collation, and output using the MDI panel.
(d) Read/punch busy signal (RPBSY)
[Classification]
Output signal
[Function] Reports that program registration or output started with the external read start signal or exter-
nal punch start signal is being performed.
[Output Condition]
The signal goes high when:
⋅ In response to the external read signal or external punch signal, corresponding operation
(registration or output) starts.
The signal goes low when:
The operation started in response to the external read signal or external punch signal (reg-
istration or output) terminates.
⋅ The signal goes low in any of the following cases: When operation has terminated nor-
mally, when operation has been terminated forcibly by a reset, and when operation has
been stopped forcibly by the external read/punch stop signal.