SMC Networks EX600-SEC Series Operation Manual page 40

No. Problem
Abnormal analogue input
device operation
16
Abnormal analogue
output device operation
Presumed cause
Power supply for control
and input is abnormal.
Analogue input signal
range setting failure.
Analogue data format
does not match.
Wiring or connection is
defective.
Analogue input unit has
failed.
Analogue input device
failure.
Power supply for output is
abnormal.
Analogue output signal
range setting failure.
Analogue data format
does not match.
Wiring or connection is
defective.
Analogue output unit has
failed.
Analogue output device
failure.
Program etc. is defective.
-39-
Troubleshooting
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.
Check the analogue input device specification, and set
the input signal range which satisfies the specification.
Check whether the data format of the Analogue input
unit is properly set.
Connect the wiring correctly between the analogue input
device and the Analogue input unit.
Replace the Analogue input unit with a normal one, and
check the operation.
Replace the analogue input device with a normal one,
and check the operation. Or refer to the troubleshooting
of the analogue input device used.
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.
Check the analogue output device specification, and set
the output signal range which satisfies the specification.
Check whether the data format of the Analogue output
unit is properly set.
Connect the wiring correctly between the analogue
output device and the Analogue output unit.
Replace the Analogue output unit with a normal one,
and check the operation.
Replace the analogue output device with a normal one,
and check the operation. Or refer to the troubleshooting
of the analogue output device used.
Check if the ladder program of master, etc. is correct.
No.EX##-OMO0027