User manual

84
Output module
Symptom Possible cause Action
No outputs on an output module
will turn On.
No external input power Supply power
Low external input voltage Supply rated load power
Loose terminal screw or defective
contact
Tighten the screw and reconnect
the module
Defective I/O connector contacts Replace the output module
Defective output circuit Reconnect the output module
No outputs on an output module
will turn Off.
Defective output circuit Replace the output module
One or more inputs on an I/O
module will not change to On state
(LED is illuminated).
Output time too short Correct the program
Defective output circuit Replace the output module
One or more inputs on an I/O
module will not change to On state
(LED is not illuminated).
Incorrect output load Replace the output load
Short output wiring Reconnect the output wiring
Loose terminal screw or defective
contact
Tighten screw and reconnect the
module
Defective output contact Replace the output module or relay
Defective output circuit Replace the output module
One or more outputs on an I/O
module will not change to On state
(LED is illuminated).
Defective output circuit Replace the output module or relay
Error caused by leak or residual
current
Replace the external load
One or more outputs on an I/O
module will not turn Off (LED is not
illuminated).
Defective output circuit Replace the output module
Output changes On/Off state
erratically.
Low external input voltage Supply rated load power
Noise error Countermeasure against noise
Loose terminal screw or defective
contact
Tighten the screw and reconnect
the module
A set of 8 points on an I/O module
operate incorrectly or identically.
Loose common terminal screw
Tighten the screw and reconnect
the module
Defective terminal connector
Tighten the screw and reconnect
the module
CPU module error Replace the CPU module
Output display LED is not
illuminated.
LED error Replace the output module