HEIDENHAIN TNC 306 Technical Manual - Manual (Page 171)

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TNC 406/TNC 306 5 EMERGENCY STOP routine 4-71
5 EMERGENCY STOP routine
A PLC-input (LE360 X22/4, LE406 X42/4) and a PLC-output (LE306 X21/34, LE406 X41/34 and in the
PL410 X8/16) with the designation "control operational" are available in the control for the
EMERGENCY STOP routine.
If a malfunction is recognized in the control, the TNC switches the "control operational" output off, a
flashing error message appears on the VDU-screen and the PLC-program is stopped. This error
message cannot be canceled. After removing the fault the switch-on routine must be gone through
again.
If the input "control operational" is switched off by an event outside the control, the error message
"External EMERGENCY STOP" is displayed and the NC sets the marker M2190 and M2191. This
error message can only be canceled after the control voltage is switched on again.
The external EMERGENCY STOP is evaluated by the control as an external stop. If the external
EMERGENCY STOP is triggered during an axis movement, the moving axis is stopped in a
controlled manner. If the drive amplifiers are blocked by the external EMERGENCY STOP, the set
value output may exceed the position-monitoring fixed by the machine parameter. In this case, the
error message "Positioning error" or "Gross positioning error" will be displayed.
Set Reset
M2190 Cancelable error message is displayed NC NC
M2191 Error message "EXTERNAL EMERGENCY
STOP" is displayed NC NC