Flowchart Used When A Program Cannot Be Written To The Plc Cpu - Mitsubishi A1SJH User Manual

11. TROUBLESHOOTING
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?
STOP
Is the memory protect
switch OFF?
OFF
YES
Is a ROM
memory cassette
used?
NO
Counstult your nearest Mit-
subishi representative.
RUN
Set the RUN/STOP
keyswitch to STOP
Can the program be
written?
Replace the PLC CPU.
NO
Can the program be
written?
NO
Switch OFF the memory
protect.(M.PRO OFF)
NO
Can the program be
written?
Replace the E
memory cassette or use a
built-in RAM
NO
Can the program be
written?
11 - 9
MELSEC-A
YES
NO
YES
YES
2 PROM
YES
End