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CHAPTER10 CPU MODULE PROCESSING TIME
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CHAPTER10 CPU MODULE PROCESSING TIME
This chapter describes the CPU module processing time.
10.1
Scan Time
This section describes the scan time structures and CPU module processing time.
10.1.1
Scan time structure
A CPU module sequentially performs the following processing in the RUN status.
Scan time is the time required for all processing and executions to be performed.
*1: End of a program indicates the timing when the END, GOEND, FEND, or STOP instruction is executed.
Figure 10.1 Scan time structure
STOP/PAUSE status
STOP/PAUSE
processing
NO
YES
Operating status check
RUN status
Common processing time
Instruction execution time
Processing
in the RUN status
Program check
I/O refresh
Execution of the DUTY instruction in END processing
(no execution when the DUTY instruction is not used)
Program execution
End the program?
*1
Refresh via MELSECNET/H
Refresh via CC-Link IE controller network
Refresh via CC-Link
Refresh by the intelligent function module
parameters set in GX Configurator
Calendar update, error clear
Device data latch processing
Service processing
Processing during the constant scan waiting time
(no processing when the constant scan time is not set)
WDT reset, scan time calculation
Scan time
Common END processing time
I/O refresh time
Instruction execution time in END processing
Module refresh time
Function execution time
in END processing
in END processing
Service processing time