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(4) Waiting time from when END processing is executed until next scan starts
Sequence program processing is stopped during the waiting time from when END processing of a
sequence program is executed until next scan starts.
(a) When an interrupt factor occurs during waiting time
Either of the following programs is executed
• Interrupt program
• Fixed scan execution type program
(b) When a service processing parameter is set
The communication service processing with peripherals (such as GX Developer) and intelligent function
modules is enabled during the waiting time by setting a service processing parameter. (
(5) Constant scan accuracy
The constant scan accuracy is 0.01ms.
However, when any program indicated below is being executed, the constant scan time may increase.
(a) Interrupt program or fixed scan execution type program
Interrupts are disabled while an interrupt program or fixed scan execution type program is executed.
Even if the constant scan time runs out during execution of an interrupt program or fixed scan
execution type program, the constant scan cannot be finished.
In this case, the constant scan time may increase by the execution time of the program executed.
6 - 6
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Section 6.24.1)
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