SMC Networks EX600-ED Series, Operation Manual

Page: 42 / 82

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No.EX##-OMN0030-A
No. Problem Presumed cause Troubleshooting
Polarity of input does not
match.
If the polarity (PNP, NPN) of the input unit and the input
device are different, replace one of them to make the
combination match.
Power supply for control
and input is abnormal.
Check if the green PWR LED of the SI unit is ON. If the
LED is OFF, or the red LED is ON, supply 24 VDC ±10%
to the power supply for control and input.
Wiring or connection is
defective. Connect the wiring correctly between the digital input
device and the digital input unit.
Input unit has failed.
Replace the input unit with a normal one, and check the
operation.
Abnormal digital input
device operation
Input device failure.
Replace the input device with a normal one, and check
the operation. Or refer to the troubleshooting of the input
device used.
Polarity of output does not
match.
If the polarity (PNP, NPN) of the output unit and the
output device are different, replace one of them to make
the combination match.
Power supply for output is
abnormal.
Check if the green PWR(V) LED of the SI unit is ON. If
the LED is OFF, or the red LED is ON, supply 24 VDC
+10/-5% to the power supply for output.
Wiring or connection is
defective. Connect the wiring correctly between the digital output
device and the digital output unit.
Output unit has failed.
Replace the Output unit with a normal one, and check
the operation.
Output device failure.
Replace the output device with a normal one, and check
the operation. Or refer to the troubleshooting of the
output device used.
13
Abnormal digital output
device operation
Program etc. is defective.
Check whether the ladder program etc. of PLC are
correct.