FX1S Series Programmable Controllers Diagnostics 7
7-2

7.1.1 ERROR LED ON (CPU ERROR)

Fault
ERROR
LED ON
Remedy
Reset PLC.
Power
OFF,ON
and trigger
RUN in-
put.
Possibl e
results
LED OFF Has the memory cassette been
installed or removed while the units
has still been powered?
LED is lit
Remedy
Possible
results
LED is lit
Power O FF
Discon-
nect earth/
ground ter-
minal LED is flash-
ing
Check for programming error. Ensure the earth/
ground cable is correctly rewired.
Power O N
Remedy
Possible program/scan time error.
Check D8012 for program scan time,
(units 0.2 msec must be less than 0.2
sec, i.e data value <2000).
Possible results
D8012 > D8000
POWER
RUN
ERROR
A
A
B
PLC M/C PLC M/C PLC M/C
99 8
B