140 D50 PLC User's Manual
Digital Outputs
Symptom Expected Cause Troubleshooting
No external input power Supply power.
Low external input voltage
Make sure full voltage is being
supplied.
Terminal screw is loose/
Defective contact
Tighten screw/
Reconnect module
I/O contact connection Replace the module.
No outputs on the module will
turn On.
Defective output circuit Reconnect the module.
One or more outputs on an I/O
module will not change to On
or Off state.
Output circuit error Replace the module.
Output time too short Correct the program.Output on an I/O module will
not turn Off (LED is not
illuminated).
Defective output circuit Replace the module.
Incorrect output load Replace the output load.
Loose output wiring Reconnect the output wiring.
Terminal screw is loose/
Defective contact
Tighten screw/
Reconnect module
Output contact error Replace the module of the relay.
Output on an I/O module will
not turn Off (LED is
illuminated).
Defective output circuit Replace the module.
Output contact error Replace the module of the relay.
Output on an I/O module will
not turn On (LED is
illuminated).
Leakage current to low-current load Apply leakage current protection
Output on an I/O module will
not turn On (LED is not
illuminated).
Defective output circuit Replace the module.
Low external input voltage Make sure full supply voltage is being
input.
Noise error Troubleshoot for noise.
Output changes On/Off state
erratically.
Terminal screw loose/
Defective contact
Tighten screw/
Reconnect module
Common terminal screw loose Tighten the screw.
Defective contact/
Terminal connector
Reconnect the module.
All outputs on a module with
the same common operate
incorrectly or identically.
CPU module error Replace the CPU module.
Output display LED is not on
(output is On to field device).
LED error Replace the module.
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