Siemens S7-400PLC can set a fixed scan time - Database & Sql Blog Articles

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1, you can set, find the CPU properties you use, you can see 'Scancycletime'. You can see the current scan cycle.
2. How to check the scan time:
a. You can monitor the scan cycle online: connect PC and 400 and open 'hardware' and go online. Double-click the CPU to open the 'ModuleInformation' dialog box and select 'Scancycletime' to see the current scan cycle.
b. By programming, there are three variables related to the scan cycle in the temporary variable in OB1, 'OB1_PREV_CYCLE', the time of the previous scan cycle, 'OB1_MIN_CYCLE' and 'OB1_MAX_CYCLE' are the minimum and maximum scan cycles during the operation, respectively. It can be observed by programming MOVE to M or DB storage area.