Mitsubishi MELSEC QS Series, Руководство пользователя

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