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1 PROGRAM EXECUTION
1.2 Scan Time
1.2 Scan Time
The CPU module repeats the following processing. The scan time is the sum total of each process and execution time.
*1 This process is included in the initial scan time.
Initial scan time
This refers to the initial scan time when the CPU module is in the RUN mode.
How to check the initial scan time
The initial scan time can be checked by the following information:
• Value stored in SD518 (initial scan time (ms)), SD519 (initial scan time (s))
• Program list monitor (GX Works3 Operating Manual)
Monitoring the initial scan time
The initial scan time is monitored by the initial scan time execution monitor time. (5 SCAN MONITORING FUNCTION)
■Initial scan time execution monitor time precautions
• Set an initial execution monitor time longer then the execution time of the initial scan time. An error occurs when the initial
scan time exceeds the set initial execution monitor time.
• The measurement error margin of the initial scan execution monitor time is 10 ms. For example, if the initial execution
monitor time (t) is set to 100 ms, an error occurs in the initial scan time in the range 100 ms < t < 110 ms range.
I/O refresh
Program operations
END processing
RUN time
Scan time
RUN time initialization processing*1