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Toshiba nv Series
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Chapter 7 Troubleshooting
6F8C1575
68
Controller module check
If the RUN LED of the controller module does not light up although POWER LED of the
power module remains lit up, check the following:
ERRLED
RUN
RUNLED
ON
YES
NO
RUN
ON
OFF
DSW - 1, DSW - 2 ON
/
Figure 7-3 Controller module check procedure
Control program check
If the sequence does not operate as desired although the program is running, check that
the following conditions are satisfied:
The signal is not being output to the same coil or register in two or more locations in
one scan.
Any signal changing at a higher speed than the scan cycle is not attempted to be
input.
The same timer or counter register is not in use for two or more timer or counter
instructions.
If the interrupt function is used, any device or register affecting main program
operation is not being manipulated in the interrupt routine.
No error has occurred during write to Flash ROM.
If a Flash ROM write error has occurred, retry to run the Flash write command again
using the program.
Is ERR LED blinking or on?
NO
YES
YES
Light Off
Is controller module's mode
switch placed in RUN?
Are all dip switches kept ON
when power is turned on?
If the LED is still blinking or remains lit u
p, the
module is faulty. Replace the controller module.
Change the switch to RUN.
By default, all dip switches are OFF. If
DSW
-
7
and -8 are kept on when power is turned on,
memory is cleared. Before clearing memory,
check that the master program
is backed up with
media.

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