It is accessible via Data Files - S2 – Status (from the Project Properties tree). In the context of PLC5 and Micrologix (using RSLogix 5 and RSLogix 500 respectively), you will be using the status file of “S:1/15”. How To Use It For PLC5 and SLC 500 Processors Change CPU mode using key switch for example key were to be changed from Run to Program and Run mode again (see illistration below).The First Scan Flag will be triggered after the following process upsets. It can also be used when the key switch status changes in the PLC. I have used it in many capacity during the system initialiation or power loss situation. It will be energized on the first normal scan of the routines in the current program. If you have a case where you have to initialise a set of tags, flags or registers on your first run though the routine or rung, then you will have to use the first scan flag or first scan status flag.
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