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| 3/17/2011 2:56 PM | |
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Posts: 2348 Rating:
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If your byte is written by OS (i.e. it's configured in HWKonfig->CPU->Clock memory) then your resetting would be overwritten by PLC's OS. |
| 3/18/2011 4:44 AM | |
Joined: 10/7/2005 Last visit: 6/9/2023 Posts: 2969 Rating:
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Hello GrahamPSNWater I agree with Aret, note too thoughthat the CPU clock memory bits are updated by the OS asynchronously to the scan (i.e. the update takes place at any timethe program cycle). Note further that the whole Clock Byte is updated a regular intervals (you can think of it ashaving a cyclic interrupt OB writing a value into the Clock byte). Your PLC logic which also wants to set or reset M124.5 will however still be able to change the status of M124.5,only to have its status overwrittenby theOSat regular intervals. I hope this helps |
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