Omron Sysmac CJ Series, Operation Manual

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Troubleshooting Section 5-2
Special I/O Unit Restart Bits
Note When an error cannot be cleared by turning ON the PLC or toggling the Unit’s
Special I/O Unit Restart Bit, refer to
5-1 Error and Alarm Processing for details
on correcting the cause of the error.
5-2 Troubleshooting
If some problem develops with the Temperature Control Unit, use the following
procedure to isolate and correct the problem.
Bit Function Remarks
A50200 Unit 0 Restart Bit The corresponding Special I/O Unit will
restart when its Restart Bit is turned ON and
OFF.
A50201 Unit 1 Restart Bit
:
: :
:
A50215 Unit 15 Restart Bit
A50300 Unit 16 Restart Bit
:
: :
:
A50714 Unit 94 Restart Bit
Check LED Indicators.
Check switch settings
and wiring.
Check the Temperature Controller Unit’s operating status with the
LED Indicators.
Follow the procedures described in
5-1 Error and Alarm Processing
to isolate and correct any problems indicated by the LED Indicators.
Check the switch settings and wiring.
•
Power Supply
1. Is the power supply ON?
2. Is the voltage at the terminals within the allowed range?
•
Switches
Are the switch settings correct for the system you are using?
•
Wiring
1. Is the terminal block wiring correct?
2. Is the polarity correct (not reversed)?
3. Are any power lines disconnected?
4. Are any of the systems wires and cables broken or shorted?
If the system checks did not reveal the source of the problem, try to
isolate the problem from the symptoms using the tables on the
following pages. Troubleshoot from
symptoms.