Web Server - Siemens SIMATIC S7-1500 Function Manual

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3.2 Diagnostics
Program-/Communication load
With the "Value refresh" function, you update the data displayed in the bar charts:
● At intervals of 1 second
● Automatic (as configured in STEP 7)
With the "Measurement" function, you can decide which measurement the bar charts
display. You can choose between:
● The current measurement
● The measurement of the longest cycle time
Figure 3-11
The legend of the program-/communication load shows information on the following values,
highlighted in color:
● "Program load cyclic program OBs"
required computing time in percent within a cycle for cyclic program OBs
● "Program load high-priority OBs"
Required calculation time in percent within a cycle for higher-priority OBs
● "Current communications load"
Required calculation time in percent for current communications tasks within a cycle
● "Maximum permissible communication load"
The configured maximum communication load as a percentage
● "No-load operation"
There is no program-/communication load
Note
When you have configured a minimum cycle time, it can happen that no-load operation
displays a high percentage value, although the value of the cycle time is also high.
The reason for this is that the loads are recorded as mathematical average of the last
second, but the cycle time relates to the last cycle.
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Program-/Communication load
Function Manual, 11/2019, A5E03484625-AG

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