Omron SYSMAC CX-Programmer 8.1, Operation Manual

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SFC Program Size and Execution Time Appendix C
130
C-2 SFC Program Execution Time
The SFC program execution time varies depending on the following:
- CPU Unit model
- Active/inactive status of the steps
- Combination of AQ types of the actions
- Areas specified in the Function Block/SFC Memory Allocation Dialog Box.
The following table shows the standard execution time of each element:
(Unit: Micro second)
PLC Model Element Element status
CJ2 CJ1-R CJ1H CJ1G CJ1M
Task 0.3 to 10 0.4 to 15 0.4 to 15 0.7 to 15 0.9 to 20
Active 5 to 10 7 to 12 7 to 12 7 to 12 10 to 17 Step
Inactive 0.2 0.3 0.3 0.4 0.5
Executed 0.1 to 9 0.1 to 12 0.1 to 12 0.2 to 13 0.2 to 18 Boolean
Not executed 0.1 to
0.5 0.1 to
0.7 0.1 to
0.7 0.2 to
1.3 0.2 to
1.6
Executed 0.6 to 9 0.7 to 13 0.7 to 13 1.6 to 14 1.7 to 20
Action
Ladder/ST
program
Not executed 0.2 to
0.8 0.2 to
0.8 0.3 to 1 0.5 to 2 0.6 to
2.5
Executed 0.2 0.2 0.3 0.4 0.6 Boolean
Not executed 0.1 0.1 0.2 0.3 0.4
Executed 0.5 0.5 0.6 1.3 1.6
Transition
Ladder/ST
program
Not executed 0.1 0.1 0.2 0.3 0.4
Executed 0.6 0.6 0.7 1.3 1.7 Subchart
Not executed 0.3 0.3 0.3 0.6 0.8
Example of SFC Program Execution Time
When CJ2H-CPU68-EIP is used and Step 1 is active in the SFC program shown below, the execution
time of the SFC program is about 13
µ
seconds, including neither the action program size nor the
transition program size.
Step2 Step3
Step4
Step5 Step6
Step7
Trans1 bFlag1
bFlag3
bFlag2
bFlag4 Trans3
Trans2
Trans4
Transition1
Trans5
bFlag6
Trans7
Step1
P0 Action1
D 1s bAction1
L 1s bAction2
N Action2
S Action3
N
Action4
bFlag5
Trans6
N
Action5
Trans7
R Action3
Step1