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10
CPU MODULE PROCESSING TIME
CHAPTER10 CPU MODULE PROCESSING TIME
This chapter explains the CPU module processing time.
10.1 Scan Time
This section explains the scan time structures and CPU module processing time.
10.1.1 structure and calculation of scan time
(1) Scan time structure
10
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10.1 Scan Time
10.1.1 structure and calculation of scan time
The CPU module scan time consists of the followings processings.
The CPU module performs the following processings cyclically in the RUN status.
(No processing performed when not set)
WDT reset scan time calculation
STOP status
STOP processing
* 1 : Program end indicates the timing when the END, S.QS ABORT instruction is executed.
* 2 : Indicates a calendar update or error clear.
Processing in RUN status
Program check
I/O refresh
Program execution
NO
Is program terminated?
1
YES
Various function compatibility
processing
2
Service processing
CC-Link IE controller network
or MELSECNET/H refresh
CC-Link Safety refresh
Constant wait processing
Operation status identification
RUN status
Hardware and system
information check (update)
Diagram 10.1 Scan time structure Safety CPU
I/O refresh time
(
Section10.1.2 (1))
Instruction execution time
(
Section10.1.2 (2))
Execution time of various
functions processed at END
(
Section10.1.2 (3))
Service processing time
(
Section10.1.2 (4))
Scan time
Module refresh time
(
Section10.1.2 (5))
Common processing time
(
Section10.1.2 (6))
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