27 – 472 HEIDENHAIN Service Manual iTNC 530
X44:
PLC supply voltage
Terminal, 4-pin
Pin layout on the MC 42x (B/C):
Connectiont
erminal
Pin layout PLC outputs
1 +24 V cannot be switched off via
EMERGENCY STOP
O24 to O30
2 +24 V can be switched off via
EMERGENCY STOP
O16 to O23
3O0 to O15
40 V
If the +24-V power supply (which cannot be shut off via emergency stop) is missing at X44,
the error message Supply voltage missing at X44 appears.
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