February 2012 28 – 485
28.6 Digital I/O modules
28.6.1 Designations and positions of connectors
PLD-H 16-08-00
Positions of the
connectors
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.
PLD-H 08-16-00
Positions of the
connectors
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.
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