July 2013 8.1 Display and operation 1159
Control
in operation
If the control is at work, e.g. executing a positioning movement or an
M function, a symbol resembling an asterisk (*) is shown in the status
window.
If a running NC program is interrupted with an external stop key, the control-
in-operation symbol blinks in the status display window.
In the Positioning With Manual Data Input, Program Run, Single Block and
Program Run, Full Sequence operating modes, these conditions are reported
to the PLC with M4175 and M4176.
The marker M4175 (control-in-operation symbol is blinking) and the marker
M4176 (control-in-operation symbol is on or blinking) are not cleared
simultaneously upon an internal stop. The marker M4176 remains set during
a subsequent RUNCANCEL macro, whereas marker M4175 is already reset.
This shows that the control is still in operation during the RUNCANCEL macro.
The marker M4176 is not cleared until execution of the RUNCANCEL macro
has been completed.
If—due to the resetting of marker M4176 (control-in-operation symbol is on or
blinking) while the RUNCANCEL macro is running—impermissible PLC
reactions (e.g. range switchover, PLC positioning movements, overwriting of
machine parameters) are triggered in the PLC program, the fatal error
message PLC strobe not allowed (M4193) will be issued. If the error
message PLC strobe not allowed (M4193) appears, HEIDENHAIN
recommends setting bit 17 of MP7680 and adapting the PLC program.
Also, PLC Marker M4193 (RUNCANCEL macro active) is available. The marker
is set if a RUNCANCEL macro is active.
To delete or display the control-in-operation symbol through the PLC:
Ensure that the control-in-operation symbol is not already blinking or being
displayed by the NC.
Enter the command code in Module 9089.
Module 9089 Control in operation
The control-in-operation symbol can be set only if it is not already being
displayed by the NC, since the NC has priority over the PLC. If the symbol is
being displayed by the NC, it cannot be erased.
M4176 is not influenced by the display of the control-in-operation symbol
through the PLC.
Call:
PS B/W/D/K <Command code>
0: Clear the control-in-operation symbol
1: Display the control-in-operation symbol
CM 9089
PL B/W/D <Error code>
0: Control-in-operation symbol was cleared/displayed
1: Incorrect error code
2: Control-in-operation symbol is already being displayed by
the NC
3: Control-in-operation symbol is blinking
4: Control-in-operation symbol was not cleared because it is
already being displayed by the NC
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