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MELSEC-Q
4 SEQUENCE PROGRAM CONFIGURATION AND EXECUTION
CONDITIONS
4.4 RUN, STOP, PAUSE Operation Processing
The High Performance model QCPU has three types of operation status; RUN, STOP
and PAUSE status.
The High Performance model QCPU operation processing is explained below:
(1) RUN Status Operation Processing
(a) RUN status indicate that the sequence program operation is performed from
step 0 to END (FEND) instruction to step 0 repeatedly.
(b) When entering the RUN status, the output status saved at STOP status is
output by setting "Previous status" as "Output mode at STOP to RUN" at
the "PLC system" tab screen in the “(PLC) Parameter" dialog box.
(c) It usually takes 1 to 3 seconds to prepare for staring the sequence program
operation since STOP status is switched to RUN status, though it might be
longer depending on the system.
(2) STOP Status Operation Processing
(a) STOP status indicates that the sequence programs are stopped by
RUN/STOP switch or remote STOP function. (See 7.6.1 for details on
remote STOP function.)
High Performance model QCPU might enter STOP status when a stopping
error occurs.
(b) When entering the STOP status, save the output status and turn off all
output.
The device memory of other than the output (Y) is retained.
(3) PAUSE Status Operation Processing
(a) The PAUSE status indicates that the sequence program operations are
paused by remote PAUSE function while maintaining the output and device
memory status. (See Section 7.6.2 for details on remote PAUSE function.)
(4) High Performance model QCPU Operation Processing with
RUN/STOP Status
Operation
processing
RUN/STOP
status
Sequence program
operation processing
External output
Device memory
(Y, M, L, S, T, C, D)
RUN to STOP
Executes up to the END
instruction and stops.
OS saves the output status
and all output are off.
Maintains the status immediately
before the STOP status.
STOP to RUN
Starts at step 0.
Determined by the output
mode of the PLC parameter
at STOP to RUN.
Starts executing the operation
from the status immediately before
the STOP status. When a device
initial value is designated,
however, the value is set. Local
devices are cleared.
POINT
The High Performance model QCPU performs the following in any of RUN, STOP,
and PAUSE status:
• I/O module refresh processing
• Data communication with 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.
Содержание QCPU (Q Mode)
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