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10
CPU MODULE PROCESSING TIME
10.1.2 Time required for each processing included in scan time
This section explains how to calculate the processing and execution times shown in
Section 10.1.1.
(1) I/O refresh time
(2) Instruction execution time
(3) Execution time of various functions processed at END
QS001CPU
10
- 3
10.1 Scan Time
10.1.2 Time required for each processing included in scan time
I/O refresh time is the refresh time for I/O data between the CC-Link Safety master
module, CC-Link IE controller network module or MELSECNET/H module and the
CPU module.
The I/O refresh time (Tio) will be calculated with the following formula:
Tio = (number I/O points)
Instruction execution time is the total processing time of instructions used in the
program to be executed in the CPU module.
For the processing time of each instruction, refer to the following manual.
QSCPU Programming Manual (Common Instructions)
The execution time of various functions processed at END is the sum of times
required for calendar update, and error clear.
(a) Calendar update processing time
This indicates the time taken to change/read the clock data at END processing
when the clock data set request (SM210 changes from OFF to ON) or the clock
data read request (SM213 turns ON) is issued.
Table10.1 Calendar update processing time
CPU module
(b) Error clear processing
This indicates the time taken to clear the continuation error stored in SD50 when
SM50 (error clear) rises (changes from OFF to ON).
CPU module
QS001CPU
0.224 + 310 (
s)
END processing time
When clock data set request
is issued
0.10ms
Table10.2 Error clear processing time
Error clear processing time
When clock data read request
is issued
0.02ms
0.13ms
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