HEIDENHAIN MANUALplus 620 Technical Manual page 178

3.5.8 PLD-H and PLA-H I/O modules
PLD-H 16-08-00
Pin layout
PLD-H 08-16-00
Pin layout
178
Connector Function
X11 PLC inputs, channel A
X12 PLC inputs, channel A
X21 PLC outputs, channel A
Diagnosis (meanings of the LEDs):
Red (X11/pin 1) status LED
• Flashes: status of I/O module OK
• Continuously on or off: error on I/O module
Yellow (per output): Status of the output
Error recognition:
Short circuit: A short circuit is reported when a current >= 20 A flows
for approximately 3 ms. Both the output-specific message and the group
message are modal.
After the short circuit has been removed, the PLC must reset the output
before it can be activated again.
Open circuit operation (line break): With load currents <= 300 mA, the
PLD 16-8 reports a line breakage.
Connector Function
X11 PLC inputs, channel A
X21 PLC outputs, channel A
X22 PLC outputs, channel A
Diagnosis (meanings of the LEDs):
Red (X11/pin 1) status LED
• Flashes: status of I/O module OK
• Continuously on or off: error on I/O module
Yellow (per output): Status of the output
Error recognition:
Short circuit: A short circuit is reported when a current >= 20 A flows
for approximately 3 ms. Both the output-specific message and the group
message are modal.
After the short circuit has been removed, the PLC must reset the output
before it can be activated again.
Open circuit operation (line break): With load currents <= 300 mA, the
PLD 08-16 reports a line breakage.
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