10. Troubleshooting

10.1.5Output check

If the output status monitored on the programming tool is normal but the external output device (load) is not operated normally, check the following points:

 

Is the output status LED

 

changed ON/OFF according

 

No

to the program execution ?

 

 

 

 

Yes

 

 

 

 

 

 

 

 

Check the voltage between

 

 

the output terminal and its

 

common terminal.

 

It should be 0 V when the

 

output is ON, and it should

 

be the circuit voltage when

 

the output is OFF.

 

 

 

 

Normal

 

 

 

 

 

 

 

 

Check the voltage at the load

 

 

 

 

 

 

 

 

 

 

Check whether the I/O allocation table is identical to the actual I/O configuration

Not identical

Execute the automatic I/O

allocation, and check whether the I/O allocation table is now identical to the actual I/O configuration

Still not identical

Is the allocation mismatch for

a specific option card, I/O module, or expansion unit ?

No

Is the allocation mismatch for all I/O modules mounted on the expansion rack ?

If it is the circuit voltage at the output is ON, or if it is 0 V at the output is OFF with the load ON, the T1/T1S’s output circuit may be faulty.

If it is 0 V and the load is also OFF, check the output power and the output cable connections.

If it is not normal, check the output cable connections.

If it is normal, check the specification of the load, also check environmental factors.

If identical, the T1/T1S’s internal circuit or the output circuit may be faulty.

If it becomes identical, execute the EEPROM write operation.

If so, the card, module or expansion unit may be faulty. For expansion unit, check the expansion cable also.

If so, check the connection between the T1/T1S basic unit and the expansion rack. If not, the T1/T1S basic unit may be faulty.

298 T1/T1S User’s Manual

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Toshiba PROSEC T1 T1S, 6F3B0250 user manual Output check