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gert · Member 3 Joined: 02 Jan 2015 Posts: 645

Establishing the DP response time, HMI update time and the HMI operating time for typical configurations on the non-synchronized PROFIBUS DP

Many applications require a quick response time via the distributed inputs and outputs. In SIMATIC, mainly PROFIBUS DP is used for quick and efficient data exchange between distributed I/O and S7 stations. Typical DP configurations consist of a DP master and several DP slaves on a DP line. Programming devices or operator panels (load at the subnet) are often operated on the same DP line.
When planning such configurations the following questions arise even in the concept phase:

How long does it take until a distributed output responds to a distributed input?
How long does it take during process alarms until a distributed output responds to a distributed input?
What fluctuations can occur?
What influence does communication via PROFIBUS DP have on the cycle time of the DP master?
What times are to be expected when operating TouchPanels?

With the use of Panel PCs, some further questions arise:

How do the response times behave, if a WinAC RTX as well as a WinCC flexible runtime configuration run on a PanelPC?
What are the effects of a WinCC flexible Runtime configuration of a PanelPC on the times of additional TouchPanels?

The following screen shows the schematic layout of the measurement on a variant:
Performance Data-Establishing the DP response time Performance Data-Establishing the DP response time

Online interface:
Performance Data-Establishing the DP response time Performance Data-Establishing the DP response time

Access to the performance data
Click the respective version to go to the web interface of the performance data.
https://www.automation.siemens.com/perfdata/perfdata.aspx?version=28&lang=en