12.
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OVERVIEW OF PROCESSING PERFORMED BY THE QnACPU
12.2 Operation Processing of RUN, STOP, PAUSE, and STEP-RUN
The QnACPU has four kinds of operation statuses: RUN, STOP, PAUSE, and step
operation (STEP-RUN) statuses.
Operation processing of PLC CPU in each operation status is explained here.
(1) RUN status operation processing
(a) The RUN status represents a status in which sequence program operation is
repeated in the order from step 0 END (FEND) instruction step 0.
(b) When entering the RUN status, the CPU outputs the output status data saved in
STOP status according to the output mode setting parameter for STOP RUN.
(c) Processing time from switching STOP RUN to the start of the sequence
program operation is usually one to three seconds, although it may vary
depending on the system configuration.
Note that it may be longer than this depending on the conditions.
(2) STOP status operation processing
(a) The STOP status is a status in which sequence program operation is stopped by
the RUN/STOP key switch or due to remote STOP (see Section 10.6.1).
(b) When entering the STOP status, the CPU saves the output status data and turns
all output points to OFF. Data memories except for output (Y) are retained.
(3) PAUSE status operation processing
(a) The PAUSE status represents a status in which operation of sequence program
is suspended with the output and data memory statuses retained. (Refer to
Section 10.6.3)
(4) Step operation (STEP-RUN) operation processing
(a) STEP operation is an operation mode in which operation processing of a
sequence program can be paused/continued by each instruction using GPP
function. (Refer to Section 8.7)
(b) Since an operation processing is paused while retaining the output and data
memories, the execution condition can be confirmed.
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