Toshiba T2N - Manual (Page 94)

6.Troubleshooting
User’s manual 79
When the “POWER” LED of the power supply module is lit, but the “RUN” LED
of the CPU module is out, check the following items.
When it blinks even if power supply
is on, CPU module is defective.
Replace the CPU.
Is the FLT LED blinking? Blinking
Out or lit.
Is the FLT LED lit? An error has occurred.
Check the content of the Event
History. Lit
Out
Is the CPU module
operation mode switch to
RUN?
Shift to RUN.
NO
YES
Is the RUN/Stand-By
switch set to OFF
(RUN)? It starts up in the HALT mode
despite the setting of the operation
mode switch.
Therefore, either
shift the operation
mode switch → HALT → RUN or start
RUN from the programmer.
NO
Is the RUN LED
blinking? Blinking
OFF
(RUN)
It is in the HOLD mode.
Release HOLD using the
programmer.
When the control operation does not operate properly although the program is
executed, check the following items.
(1) Is there an output to the same coil or register at 2 or more places in 1 scan,
or, is there an overlap of the device for coil instruction and function block
instruction?
(2) Is there an attempt to input a signal which changes faster than the scanning
cycle?
(3) Is the same timer register or counter register being used for multiple timer
instructions or counter instructions?
(4) When interrupt is in use, is a device or register operating during the interrupt
program which affects the operation of the main program?
(5) Is any EEPROM error occured?(S0039, S0051 is 1.)
In this case, carry out EEPROM write command by the programmer.
6.4
Program Check
6.3
CPU Check