1 PROGRAM EXECUTION
1.4 Execution Type of Program
31
1
Action when the execution condition is satisfied
Performs the following action.
■If the execution condition is satisfied before the interrupt is enabled by the EI instruction
The program enters the waiting status and is executed when the interrupt is enabled. Note that if the execution condition for
this fixed scan execution type program is satisfied more than once during the waiting status, the program is executed only
once when the interrupt is enabled.
■When there are two or more fixed scan execution type programs
When the specified time intervals expire in the same timing, the programs are executed in order according to the priority (I31
> I30 > I29 > I28) of the periodic interrupt pointer.
■If another or the same execution condition is satisfied while the fixed scan execution type
program is being executed
Operates according to the fixed scan execution mode setting.
■If the execution condition is satisfied while the interrupt is disabled by the system
Operates according to the fixed scan execution mode setting.
■If an interrupt factor occurs during link refresh
Suspends link refresh and executes the fixed scan execution type program. Even while station unit block guarantee is
enabled for cyclic data during refresh of such links as CC-Link IE Field Network, if the fixed scan execution type program uses
a device specified as the refresh target, station unit block guarantee for cyclic data is not available.
■When an interrupt is generated during a standby while executing constant scan
Executes the fixed scan execution type program.
*1 If processing does not finish during the waiting time, the scan time is extended.
■If another interrupt occurs while the fixed scan execution type program is being executed
If an interrupt program is triggered while the fixed scan execution type program is being executed, the program operates in
accordance with the interrupt priority.
(1) Suspends link refresh and executes the fixed scan execution type program.
Execution of the fixed scan execution
type program
Execution of link refresh
Interrupt factor
10 ms 10 ms 10 ms
(1)
10 ms
Fixed scan interval
END processing
Scan execution type program
Fixed scan execution type program
Condition
established
Constant scan
*1
Waiting time
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