Toshiba PROSEC T1 User Manual page 298

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
Check the FLT (fault) LED
Is the RUN LED blinking ?
Connect the programming
tool, and check the T1/T1S's
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
296
T1/T1S User's Manual
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mode control switch
status
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.
If it is not in R (RUN) position, turn the
switch to R (RUN) position.
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.
If it is blinking, the T1/T1S is in the HOLD
mode. Check your program whether the
HOLD device (S401) is not used.
If the T1/T1S stays in HALT mode even
when the mode control switch is changed,
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.