HEIDENHAIN TNC 407 (243 020) Technical Manual - Manual (Page 245)

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TNC 407/TNC 415/TNC 425 5 EMERGENCY STOP-routine 01.98
5 EMERGENCY STOP-routine
A PLC-input (X42/4) and a PLC-output (X41/34 and in the PL410 B: X8/16) with the designation
"control is ready" are available in the control for the EMERGENCY STOP-routine.
If a malfunction is recognized in the control, the TNC switches the control-is-ready output signal off,
a flashing error message appears on the VDU-screen and the PLC-program is stopped. This error
message can not be cancelled. After removing the fault the switch-on routine must be gone through
again.
If the control-is-ready signal 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 cancelled 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 nominal-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.
EMERGENCY STOP can be suppressed with Marker M2827. If Marker M2827 is set, an external
EMERGENCY STOP is not reported to the NC and, instead, all control loops are opened and the NC
stops.
Marker Function Set Reset
M2190 Cancellable error message is displayed NC NC
M2191 Error message "External EMERGENCY STOP" is displayed NC NC
M2827 Suppress EMERGENCY STOP, open the control loop, stop NC PLC PLC