Siemens SM2 monitoring system 用户手册
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U3585-J-Z125-8-76
Accuracy of the SM2 data
Notes on SM2 operation
6.2.3
Measures for reducing the error sources
From the above explanations, the following recommendations can be deduced; they should
be observed if high importance is placed on the accuracy of the data.
be observed if high importance is placed on the accuracy of the data.
1. Minimization of marginal problems
The monitoring cycles should be long but not too long. Short-term peak loads will not
be detected if the monitoring cycles are too long because SM2R1 only supplies the total
activity or the average value for the whole monitoring cycle.
All desired monitoring functions should be activated before (not during) the monitoring
cycle.
Similarly, the desired monitoring functions should be kept active somewhat longer than
the monitoring cycle. For later analysis with SM2R1 the desired monitoring cycle should
be specified as the analysis period.
be detected if the monitoring cycles are too long because SM2R1 only supplies the total
activity or the average value for the whole monitoring cycle.
All desired monitoring functions should be activated before (not during) the monitoring
cycle.
Similarly, the desired monitoring functions should be kept active somewhat longer than
the monitoring cycle. For later analysis with SM2R1 the desired monitoring cycle should
be specified as the analysis period.
2. Reduction of the number of objects to be monitored
This reduces the induced system workload, which results in less falsification of the
monitored system.
monitored system.
3. Sufficiently large number of samples
As a rule, this should be implemented not by increasing the sampling rate but by length-
ening the monitoring cycle. The sampling rate should be increased only if the system
workload permits or if it is not possible to lengthen the monitoring cycle.
ening the monitoring cycle. The sampling rate should be increased only if the system
workload permits or if it is not possible to lengthen the monitoring cycle.