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3/31/2009 7:05 AM | |
Joined: 9/27/2006 Last visit: 8/21/2024 Posts: 12279 Rating:
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Hello Tom; I am uneasy about the Step 7 hardware configuration you have shown. You are using the panel as a Profibus-DP slave.to the CPU's master interface. This is a configuration you would use if the case of a non-Siemens CPU where a Master/slave relationship would be the only one available. But in standard Profibus configuration, at least in Siemens' world, the panels are considered masters like the CPUs, Masters Class 2 to be more precise. they are allowed to capture the token and collect the data from all Masters Class 1 (CPU's standard DP master) present on the bus. They hold no specific DP configuration and do not interrogate slaves cyclically as Masters Class 1 do. Look at the Technology tab of profibus.com to have more information on different classes of master in Profibnus-DP communications. Basically, when you need to configure a panel with a S7 CPU, you have a choice of integrating ProTool/WinCCFlexible to Step 7. If you do, you can add an OP station in the program, and use Netpro to connect it to a bus. Then the rest of the configuration is done in the panel's software. This is the easier way to interconnect OPs and CPUs. The following FAQ will discuss this issue for ProTool, but the information should be helfpul to youin any case: http://support.automation.siemens.com/WW/view/en/213446 So I would recommend that you remove the panel that you have configured as a slave at this point, and check the WinCC Flexible configuration. Hope this helps, Daniel Chartier |
Last edited by: dchartier at: 3/31/2009 7:07 AM |
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