HEIDENHAIN TNC 122 Technical Manual - Manual (Page 34)

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TNC 122 9 Machine Integration 33
9.7 EMERGENCY STOP Circuit
The control has one PLC input (X41/28) and one PLC output (X41/10) with the designation “Control is
ready” for the EMERGENCY STOP routine.
If a malfunction is recognized in the control, the TNC switches the control-is-ready output off, a
blinking error message appears on the screen, the PLC program is halted and the outputs are reset.
This error message cannot be cleared. When the error has been corrected it is necessary to run
through the switch-on routine again.
If the control-is-ready input is switched off by an event outside the control, the following error
message will appear:
EMERGENCY STOP
The NC then sets markers M2190 and M2191. This error message cannot be cleared until the
control voltage is switched on again.
When an EMERGENCY STOP occurs all outputs are reset.
The control evaluates an external EMERGENCY STOP like an external and internal stop. If the
EMERGENCY STOP button is pressed while an axis is moving, the axis is brought to a stop. I
If the EMERGENCY STOP causes the servo amplifier to block, the output nominal values can
exceed the position monitoring defined by machine parameters. In such a case the following error
message will be displayed:
POS. ERROR
Set Reset
M2190
Non-blinking error message displayed NC NC
M2191 EMERGENCY STOP displayed NC NC