Run, Stop, Pause Operation Processing - Mitsubishi Electric MELSEC-Q Series User Manual

4 SEQUENCE PROGRAM CONFIGURATION & EXECUTION
CONDITIONS

4.4 RUN, STOP, PAUSE Operation Processing

Operation
processing
RUN/STOP
state
RUN to STOP
STOP to RUN
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The Basic model QCPU has three types of operation states; RUN, STOP and PAUSE
states.
The Basic model QCPU operation processing is explained below:
(1) RUN Status Operation Processing
(a) RUN status is when the sequence program operation is performed from
step 0 to END (FEND) instruction to step 0 repeatedly.
(b) When entering the RUN state, the output state saved at STOP by the
parameter output-mode setting during STOP to RUN.
(c) The processing time of switching from STOP to RUN until the beginning of
sequence program operation changes with system configurations, but
usually is 1 to 3 seconds.
However, this time may be longer depending on the conditions.
(2) STOP Status Operation Processing
(a) STOP status is when the sequence program operations are stopped with
the RUN/STOP/RESET switch or remote STOP is performed. (Refer to
Section 7.6.1 for details regarding of remote STOP function.)
The STOP status is also caused by a stopping error.
(b) When entering the STOP state, save the output state and turn off all output.
The device memory of other than the output (Y) is retained.
(3) PAUSE Status Operation Processing
(a) The PAUSE state is when the sequence program operations are paused by
remote PAUSE function while maintaining the output and device memory
status. (Refer to Section 7.6.2 for details regarding of remote PAUSE
function.)
(4) Basic model QCPU Operation Processing with RUN/STOP state
Sequence program
operation processing
Executes up to the
END instruction and
stops.
Starts at step 0.
POINT
The Basic model QCPU performs the following in any of RUN, STOP, and Pause
state:
• I/O module refresh processing
• Data communication with the GX Developer and serial communication module
• Refresh process of MELSECNET/H and CC-Link
For this reason, I/O monitor and test operation using GX Developer, reading/writing
from the serial communication, communication with another station using
MELSECNET/H, and communication with a remote station over the CC-Link can
be made even in the STOP or PAUSE status.
External output
OS saves the output state
and all output are off.
Determined by the output
mode of the PLC parameter
at STOP to RUN.
MELSEC-Q
Device memory
(Y, M, L, S, T, C, D)
Maintains the status immediately
before the STOP state.
Starts executing the operation
from the status immediately
before the STOP state. When a
device initial value is designated,
however, the value is set. Local
devices are cleared.
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