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T1/T1S User’s Manual
10. Troubleshooting
10.1.2 CPU check
If the PWR (power) LED is lit but the RUN LED is not lit, check the following points.
Check the position of the If it is not in R (RUN) position, turn the
mode control switch switch to R (RUN) position.
Check the FLT (fault) LED If the FLT LED is lit or blinking, the T1/T1S
is in the ERROR mode. Confirm the error
message by connecting the programming
tool. Refer to section 10.2.
Is the RUN LED blinking ? If it is blinking, the T1/T1S is in the HOLD
mode. Check your program whether the
HOLD device (S401) is not used.
Connect the programming If the T1/T1S stays in HALT mode even
tool, and check the T1/T1S’s when the mode control switch is changed,
status the switch may be faulty.
If the communication between the T1/T1S
and the programming tool is not possible,
the T1/T1S may be faulty.
10.1.3 Program check
Check the user program based on the following points if it is running but the operation
does not work as intended.
1. Whether duplicated coils are not programmed.
2. Whether a coil device and a destination of a function instruction are not overlapping.
3. Whether the ON/OFF duration of an external input signal is not shorter than the
T1/T1S’s scan time.
4. Whether a register/device which is used in the main program is not operated
erroneously in the interrupt program.
NOTE
When you write/modify the program, it is necessary to execute the EEPROM
write operation before turning off power to the T1. Otherwise the old program
stored in the built-in EEPROM will be over-written, and your program
modification will disappear.
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