Mitsubishi A1SJH - Flowchart Used When a Program Cannot be Written to the PLC CPU

11. TROUBLESHOOTING
11 - 9
MELSEC-
A
11.2.8 Flowchart used when a program cannot be written to the PLC CPU
The following shows the corrective measures when a program cannot be written to
the PLC CPU.
Program cannot be
written to the PLC CPU
Is the
RUN/STOP
keyswitch set
to STOP?
Is the memory protect
switch OFF?
Is a ROM
memory cassette
used?
Counstult your nearest Mit-
subishi representative.
End
Can the program be
written?
Can the program be
written?
Can the program be
written?
Can the program be
written?
Replace the E
2
PROM
memory cassette or use a
built-in RAM
Switch OFF the memory
protect.(M.PRO OFF)
Set the RUN/STOP
keyswitch to STOP
Replace the PLC CPU.
RUN
STOP
YES
NO
NO
YES
NO
OFF
NO YES
YES
NO YES
NO