If A Trouble Is Suspected - Toshiba nv Series Instruction Manual

Chapter 7 Troubleshooting
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:
 If the controller does not operate normally, take action according to Section 7.2, "Trouble
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6F8C1220
On power module, is POWER LED on?
YES
On controller module, is RUN LED on?
YES
On controller module, is ERR LED on?
NO
Input signal cannot be read normally
NO
Does output equipment operate
abnormally?
NO
Is symptom transient and
synchronous with operation of the
system or a function?
NO
Contact the Toshiba's service representatives.
Figure 7-1 Procedure of checks in occurrence of failure
Before removing or installing the module, terminal
block, or cable, be sure to keep power off.
CAUTION
Failure to observe it may cause a malfunction and trouble.
Note
Details Checks".
NO
Go to "■Power system check".
NO
Go to "■Controller module check".
YES
Sequence operation may be faulty.
Go to "■Control program check".
YES
Input module may be faulty.
Go to "■Input signal check".
YES
Output module may be faulty.
Go to "■Output signal check".
YES
May be affected by the external environment.
Go to "External cause check".
Mandatory