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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.
STOP/PAUSE status
STOP/PAUSE
processing
*1: End of a program indicates the timing when the END, GOEND, FEND, or STOP instruction is executed.
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
NO
*1
End the program?
YES
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
Operating status check
RUN status
Figure 10.1 Scan time structure
CHAPTER10 CPU MODULE PROCESSING TIME
I/O refresh time
Section 10.1.2(1)
(
)
Instruction execution time in END processing
Section 10.1.2(2)
(
)
Instruction execution time
Section 10.1.2(3)
(
)
Module refresh time
Section 10.1.2(4)
(
)
Scan time
Function execution time
in END processing
Section 10.1.2(5)
(
)
Service processing time
Section 10.1.2(6)
(
)
Common processing time
Section 10.1.2(7)
(
)
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