178 HEIDENHAIN Technical Manual MANUALplus 620
3.5.8 PLD-H and PLA-H I/O modules
PLD-H 16-08-00
Pin layout Connector Function Page
X11 PLC inputs, channel A 226
X12 PLC inputs, channel A 226
X21 PLC outputs, channel A 227
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.
PLD-H 08-16-00
Pin layout Connector Function Page
X11 PLC inputs, channel A 226
X21 PLC outputs, channel A 227
X22 PLC outputs, channel A 227
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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