Mitsubishi Electric MELSEC-A Series User Manual page 50

4.A2CCPU
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(1) Operation processing in RUN state
(a) The RUN state indicates the state in which the PC CPU operates a
sequence program repeatedly from step 0 to the END (FEND)
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instruction.
(b) The output status of the outputs (V) at the entry to the RUN state
varies according to the 'STOP .... RUN output" mode set with a
parameter.
1) Output of operation state before STOP
After the outputs (y) saved before the entry to the STOP state
are output, the PC CPU executes the sequence program.
2) Output after operation
Outputs
(Y)
are output after one scan of the sequence program.
The time required before starting sequence program operation
after the changing the switch from STOP to RUN varies according
t
to the system configuration; it is usually between 1 and 3
seconds.
(c) In the RUN state, the processing illustrated in Fig. 4.8 is repeated
until the operation state is changed from RUN to STOP or PAUSE.
RUN
)
Is the output
NO (After 1 scan)
mode at STOP-to-RUN
switch before
operation'?
YES (Before operation)
The status of the outputs
M
which have been saved
before entering the STOP
state is set to the device area.
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I/O modules are refreshed
Sequence program operation
processing
Step 0
to
END (FEND) instruction
END processing
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Operation state check
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•
Fig. 4.8 RUN Operation Processing
IREMARKSI
For details on individual processing in Fig. 4.8, refer to Section 4.1.1 to Section 4.1.3.
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