MITSUBISHI ELECTRIC 700 Series - Manual (Page 69)

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RUN and STOP Operation Processings
3.2 RUN and STOP Operation Processings
The built-in PLC function has two different operation statuses: RUN status and STOP
status.
This section explains the operation processings of the built-in PLC function in each
operating status.
(1) Operation processing in RUN status
A RUN status indicates that a sequence program repeats its operation in order of
step 0 to END (FEND) instruction to step 0 when SQ-SD are shorted. (P.RUN is on)
When entering the RUN status, the function outputs the output status saved at STOP
according to the "STOP to (RUN-time output mode setting" (refer to page 96).
(2) Operation processing in STOP status
A STOP status indicates that a sequence program stops its operation when SQ-
SD are opened or remote STOP is commanded. (P.RUN is off)
When entering the STOP status, the function saves the output status and turns off
all outputs. The contents of the data memories other than the outputs (Y) are
maintained.
3.3 Program Makeup
(1) Program classification
The program that can be used by the built-in PLC function is a main sequence
program only. Microcomputer, interrupt and SFC programs cannot be used.
(2) Program capacity
A program capacity indicates the capacity of the program storage memory, and it
is 1k steps. Set the program capacity in the built-in PLC function parameter.
POINT
In either the RUN or STOP status, the built-in PLC function is performing I/O refresh
processings. In the STOP status, therefore, I/O monitoring and test operation can be
performed from the peripheral device.