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11.1 Scan Time
11.1.1 Scan time structure
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CPU MODULE PROCESSING TIME
(5) Scan time structure of Universal model QCPU
* 1 : Program end indicates the timing when the END, GOEND, FEND or STOP instruction is executed.
* 2 : Indicates a calendar update, program memory check processing or error clear.
Figure 11.5 Scan time structure of Universal model QCPU
Processing in RUN status
Program check
I/O refresh
Program execution
NO
YES
MELSECNET/H refresh
CC-Link IE controller network refresh
CC-Link refresh
Constant wait processing
(No processing performed when not set)
WDT reset
scan time calculation
STOP/PAUSE processing
RUN status
STOP/PAUSE status
Refresh by intelligent function module
parameter set on GX Configurator
Various function compatibility processing 2
Common processing time
Module refresh time
Common
END
processing
time
Execution time of various
functions processed at END
Instruction execution time
I/O refresh time
END processing time and
the relevant instruction
END processing of DUTY instruction
(No processing performed
when DUTY instruction is not executed)
Service processing
Service processing time
Is program terminated?" 1
Latch processing of device
Scan time
Operation status identification
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