Toshiba 6F3B0253 user manual CPU check, Program check

6F3B0253

10.Troubleshooting

10.1.2CPU check

If the PWR (power) LED is lit but the RUN LED is not lit, check the following points.

Check the position of the mode control switch

Check the FLT (fault) LED

programming

Is the RUN LED blinking ?

whether the not used.

Connect the programming tool, and check the T1-16S’s status

If it is not in R (RUN) position, turn the switch to R (RUN) position.

If the FLT LED is lit or blinking, the T1-16S is in the ERROR mode. Confirm the error

message by connecting the tool. Refer to section 10.2.

If it is blinking, the T1-16S is in the HOLD mode. Check your program

HOLD device (S401) is

If the T1-16S stays in HALT mode even when the mode control switch is changed, the switch may be faulty.

If the communication between the T1-16S and the programming tool is not possible, the T1-16S may be faulty.

10.1.3Program 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 T1-16S’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.

284 T1-16S User’s Manual