Siemens U3585-J-Z125-8-76 1 Outputting and saving monitored data, Uninterruptible clock resetting

SM2 monitoring program Outputting and saving monitored data

Methods used for compressed output of monitored data

1. Mean values

SM2 adds up the sampled values at the end of each sampling cycle and computes a mean value for each monitoring cycle (e.g. the number of tasks) as follows:

Sum of sampled values

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Number of samples

2. Percentage frequency

At the end of each sampling cycle, SM2 records the occurrence of specific events or conditions and computes the percentage frequency of events (conditions) in relation to the total number of samples (e.g. channel utilization) as follows:

Sum of occurrences

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Number of samples

3.Ascending system counters and SM2 counters

The activity during the monitoring cycle can be determined by calculating the differences between values gathered at the beginning and the end of the monitoring cycle (e.g. idle time).

4.Computation

SM2 computes some data from monitored data, e.g. the summation values for all categories.

Uninterruptible clock resetting

SM2 works internally with UTC time. During the switch from daylight saving time to winter time and vice versa, SM2 can continue to work without interruption.

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