Mitsubishi Electric MELSEC iQ-F FX5 User Manual page 26

■Operation in the fixed scan execution mode
This section describes the operation which can be performed in the fixed scan execution mode.
• Execution Count Takes Priority
The program is executed for all the pending number of executions so that it can be executed the same number of times as
execution condition was satisfied.
Cycle interval of TEISYU
"TEISYU"
(Fixed scan execution type program)
• Precede Fixed Scan
When the waiting for execution , one execution is made when interrupt becomes allowed. Even if execution condition was
satisfied twice or more, only one execution is performed.
Cycle interval of TEISYU
"TEISYU"
(Fixed scan execution type program)
■Fixed scan execution mode setting
Use the fixed scan execution mode setting.
Navigation window  [Parameter]  [FX5UCPU]  [CPU Parameter]  "Interrupt Settings"  "Fixed Scan Execution
Mode Setting"
Window
Displayed items
Item
Fixed Scan Execution
Mode
1 PROGRAM EXECUTION
24
1.4 Execution Type of Program
Section where interruptions
Section where interruptions
Description
For Precede Fixed Scan, the periodicity of the program is maintained. For
Execution Count Takes Priority, the program is executed for all pending number
of executions.
[1]
are disabled
Delay behind the cycle
are disabled
Execution condition satisfied:
6 times
Number of executions:
6 times
All pending executions are executed and the
number of executions of the fixed scan is
guaranteed. (In the chart, three executions are
made immediately after interruption becomes
allowed [1]).
Execution condition satisfied:
6 times
Number of executions:
4 times
The program is executed once, and the fixed period
execution of the program is maintained. (Even if
execution condition was satisfied twice or more, only
one execution is made.)
Setting range
• Precede Fixed Scan
• Execution Count
Takes Priority
Default
Precede Fixed Scan