Chapter 7 Troubleshooting
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7.1 If a Trouble is Suspected
When a trouble occurs in the system, first grasp the error details thoroughly. It is
important that you should then identify whether its cause is located in the controlled
object or the controller.
One cause of a failure may have developed a secondary failure. Thus, to track down the
cause of a failure, you have to make comprehensive decision regarding the system.
If an I/O failure may have occurred on the controller unit or TC-net I/O unit, first check
the following:
Figure 7-1 Procedure of checks in occurrence of failure
CAUTION
Before removing or installing the module, terminal block, or
cable, be sure to keep power off.
Failure to observe it may cause a malfunction and trouble.
Note
・
If the controller does not operate normally, take action according to "Trouble
Details Checks".
On power module, is POWER LED
on?
On controller module, is RUN LED
on?
On controller module, is ERR LED
on?
Input signal cannot be read
normally
Does output equipment operate
abnormally?
synchronous with operation of the
Contact the Toshiba's service representatives.
YES
YES
NO
NO
Go to "
●
Power system check".
Go to "
●
Controller module check".
Sequence operation may be faulty.
Go to "
●
Control program check".
Sequence operation may be faulty.
Go to "
●
Control program check".
Output module may be faulty.
Go to "
●
Output signal check".
Output module may be faulty.
Go to "
●
Output signal check".
Mandatory
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