Mitsubishi MELSEC-A A2USHCPU-S1 - Flow for Actions When the Program Cannot be Written

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11. TROUBLESHOOTING
11.2.8 Flow for actions when the program cannot be written
The flow when the program and other data cannot be written to the CPU is described.
RUN
STOP
YES
NO YES
YES
NO
YES
ON
OFF
NO YES
Program cannot be written
to the programmable
controller CPU
Is the RUN/STOP
keyswitch set
to STOP?
Is the memory protect
switch OFF?
Is a ROM
memory cassette
used?
Counstult your nearest
Mitsubishi representative.
Set the RUN/STOP
keyswitch to STOP
Can the program
be written?
Replace the programmable
controller CPU.
Switch OFF the memory
protect.(M.PRO OFF)
Complete
NO
Can the program
be written?
Can the
program be
written?
*
Replace the E PROM
memory cassette or use a
built-in RAM
2
Can the
program be
written?
NO