<2. Basic Design and Function Design>
● Precautions When Using a Long Scan Cycle
• When scan cycle is 4 seconds or longer
Analog/digital output modules are defined with line access loss time of 4
seconds.
If the scan cycle is 4 seconds or longer, the interval between FCN-500 or
FCN-RTU CPU accesses of the output modules will be 4 seconds or longer.
Depending on individual setting, an output module may assume that a CPU
error has occurred and perform output fallback.
SEE ALSO
For details, see Section 8.1.2, "Checking Operation Specification of Analog/Digital Output” of
Chapter 8, “Detailed Description.”
• About windup of NPAS POUs
For NPAS POU, after an FCN-500 or FCN-RTU reboot, windup processing is
executed for 30 scan cycles before control computation begins.
As the windup time is proportional to the scan cycle, lengthening the scan
cycle delays the starting of control computation after an FCN-500 or FCN-RTU
boot.
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