Mitsubishi MELSEC-A Series Operating Manual page 160

6. HOW TO USE EACH FUNCTION
MElS€iC-A
.
,
IMPORTANT
I
Writing to the EEPROM when the CPU is in the RUN state is
disabled.
As for writing when the CPU is in the RUN state, only writing that
can be corrected by one instruction can be executed. Be especially
careful when the ladder configuration is being changed by writing
when the CPU is in the RUN state.
Example)
When a ladder is added by writing when the CPU is in the RUN
state
Y r
When the ladder has been added, the configuration of a ladder
has now been changed as shown below.
Rio
When writing when the CPU is in the RUN state is executed, the
switching instruction [CHG] for sub-programs and main programs
is automatically prohibited. However, an when A3ACPU is used, it
is executed.
When writing when the CPU is in the RUN state has been com-
pleted, the prohibition of the [CHG] instruction is automatically
canceled.
When changing a program by using this function, do not operate
the RUN-STOP-PAUSE-STEP RUN switch.
Doing so can destroy the program.
(5) Writing when the CPU is in the RUN state cannot be executed to
the PC CPU of another station by setting the PC number on data
link system.
(6)
If
there is a pulse instruction (PLS,[:]P) in the program when writing
is executed while the CPU is in the RUN state, the CPU executes
or does not execute the pulse instruction unconditionally after
completing writing when the CPU is in the RUN state. When it is not
necessary to execute a pulse instruction, do not change any ladders
while the CPU is in the RUN state.
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