Chapter 12 Troubleshooting MASTER-K
12-1
12 Troubleshooting
This chapter explains the types of conditions that might cause an error to be reported and gives
suggestions on how to resolve the problem.
12.1 Basic procedure for troubleshooting
The reliability of PLC system not only depends on reliable equipment but also on fast and
suitable corrective actions when an error occurs.
To resolve a problem of PLC system quickly, it is most important to find the cause of the
problem. The followings describe how to find the cause of problem.
1) Visual checks
① Operation status of system ( stop or running )
② Power supplying status ( on or off )
③ The status of I/O module
④ The external wiring ( I/O, expansion and communication cables )
⑤ The contents of error flags ( check by connecting handy loader or KGL-WIN after
above items are completed )
2) Cycling the power of PLC
See what happens on the PLC system when the key switch is moved to the STOP mode
and cycle the power of CPU module.
3) Narrow down the cause of problem.
From the result of above procedures, deduce where the cause of problem lies on, i.e;
① Inside of PLC or outside
② I/O module or other module
③ Sequence program
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