300 T1/T1S User’s Manual
10. Troubl eshooting

10.2 Self-diagnostic items

If an er r or is detected by the self- diagnostic check of the T 1/ T1S CPU, the err or
messages and t he r elat ed informat ion shown on the following pages will be recorded in
the T1/T1S’s event history table. If the error is severe and continuation of operation is not
possible, the T 1/ T1S turns OFF all outputs and stops the oper ation (ERROR mode).
The latest 15 er r or messages are st ored in the event history table. This event history
table can be displayed on the programming t ool. ( Power ON/ O FF is also r egistered)
If t he T1/T1S has ent er ed into ERROR mode, connect the program m ing tool to the
T1/T1S to confirm the err or m essage in the event history table. This inform ation is
important to recover fr om a t r ouble. For the k ey operat ions on t he pr ogramming tool to
display the event history table, refer to t he separ ate manual for the progr amming tool.
(An example of t he event hist or y)
< Event History>
Date Time Event Count Info 1 Info 2 Info 3 Mode
1. 98-02-21 16:48:01 I/O no answer 3 #00-04 RUN Down
2. 98-02-21 15:55:26 System power on 1 INIT.
3. 98-02-21 12:03:34 System power off 1 RUN
4. 98-01-15 09:27:12 System power on 1 INIT.
5. 98-01-14 19:11:43 System power off 1 HALT
6. 98-01-14 10:39:11 No END/IRET error 3 M-001 H0024 HALT Down
In the event histor y table, No. 1 message indicates the latest event recorded.
Each column shows the following inf ormation.
Date: The date when the err or has det ected (T1S only)
Time: The time when the err or has detected (T1S only)
Event: Error message
Count: Number of times t he er ror has detected by retr y action
Inf o n: Related inf or m ation to the error detected
Mode: T1/ T1S’s operation mode in which the err or has detected (INI T. means the
power-up initialization)
Down: Shows the T1/T1S has entered into ERRO R m ode by the er r or detected
If t he T1/T1S is in t he ERROR mode, operat ions t o cor rect the program are not
accepted.
In this case, execute t he Er ror reset operation by the program m ing tool to ret ur n the
HALT mode before starting the corr ection operation.
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