Omron CV500 Installation Manual page 107

Error Processing and Correction
Output Units
Symptom
Not all outputs turn ON
Not all outputs turn OFF
Output of a specific bit num-
ber does not turn ON or indi- b d ON i di
cator is not lit
Output of a specific bit num-
b ber does not turn ON (indi- d ON (i di
cator lit). cator lit)
Output of a specific bit num-
b ber does not turn OFF (indi- d OFF (i di
cator unlit).
Output of a specific bit num-
ber does not turn OFF (indi- (
cator lit). t lit)
Output irregularly turns ON/ g y
OFF OFF.
Error occurs in units of 8
points. i
Output indicator is not lit (op-
eration is normal).
94
Cause
(1) Load is not supplied with power.
(2) Load voltage is low.
(3) Terminal block screws are loose.
(4) Faulty terminal block connector con-
tact.
(5) Blown fuse
(6) Faulty I/O bus connector contact.
(7) Output circuit is faulty.
Output circuit is faulty.
(1) Output ON time too short.
(2) Bit status controlled by multiple instruc-
tions.
(3) Faulty output circuit.
(1) Faulty output device.
(2) Break in output wiring.
(3) Loose terminal block screws.
(4) Faulty terminal block connector faulty.
(5) Faulty output bit.
(6) Faulty output circuit.
(1) Faulty output bit.
(2) Bit does not turn OFF due to leakage
current or residual voltage.
(1) Bit status controlled by multiple instruc-
tions.
(2) Faulty output circuit.
(1) Low load voltage.
(2) Bit status controlled by multiple instruc-
tions.
(3) Malfunction due to noise.
(4) Terminal block screws are loose.
(5) Faulty terminal block connector con-
tact.
(1) Loose common terminal screw.
(2) Faulty terminal block connector con-
tact.
(3) Blown fuse.
(4) Faulty data bus.
(5) Faulty CPU.
Faulty indicator.
Remedy
Supply power
Adjust voltage to within rated range.
Tighten screws
Replace terminal block connector.
Replace fuse.
Replace Unit.
Replace Unit.
Replace Unit.
Correct program.
Correct program.
Replace Unit.
Replace output device.
Check output wiring.
Tighten screws.
Replace terminal block connector.
Replace relay.
Replace Unit.
Replace relay.
Replace external load or add dummy resis-
tor.
Correct program.
Replace Unit.
Adjust load voltage to within rated range
Correct program
Protective measures against noise:
(1) Install surge suppressor.
(2) Install insulation transformer.
(3) Use shielded cable.
Tighten screws.
Replace terminal block connector.
Tighten screws.
Replace terminal block connector.
Replace fuse.
Replace Unit.
Replace CPU.
Replace Unit.
Section 5-3