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7-4SectionTroubleshooting Flowcharts
120
Fatal Error Check
Identify the error, eliminate
its cause, and clear the
error.
Follow the Memory Error
Check flowchart if a
memory error has occurred.
Is the ERR indi-
cator lit?
Determine the cause
of the error with a
Programming Device.
End
RUN indicator not lit.
Replace the CPU
Board.
Is PC mode displayed
on Programming
Device?
Turn the power
supply OFF, and
then ON again.
Switch to RUN or
MONITOR mode.
No
Yes
Is a fatal error
displayed?
Is PC mode displayed on
Programming Device?
No
Yes
Yes
No
Is the RUN
indicator lit?
No
Yes
Yes
No