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TIA V17 PLC Application Topology View

Created by: sanjay_das157 at: 5/1/2023 12:17 PM (4 Replies)

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5/1/2023 12:17 PM	Rate (0)
sanjay_das157 Posts: 7 Rating: (0)	I am new to whole world of PLC programming and Industrial application. Recently I have using a TIA V17 PLC application for testing a vendors Profinet firmware. I noticed 2 behaviour . Scenario : A batch of 32 drives are connected in Daisy Chain network with I/O cycle set as 1 ms using 1500 PLC. When all drives came online – we disconnected any drive say 7^thin sequence and observed that drives 1-6 at random showed flickering “Fieldbus Warning” warnings / connect – PLC connect / disconnect messages. Note that we have set Watchdog timer 3ms for all drives. We observed that when we remove the cables connection as in [New Topology Changes View.png] wrt old Topology [Old Topology View] in Topology view of PLC program having 1ms I/O connection and 3ms Watch Dog timer – the issue in concern does not occur. Why do we see such a difference in between two different topologies - do we need to correct some config in [Old Topology View]? Is it a PLC Application issue or issue with the Firmware? Attachment Files.zip (581 Downloads)
sanjay_das157 Posts: 7 Rating: (0)	Last edited by: Jen_Moderator at: 05/02/2023 05:43:19 Added file from closed topic.
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5/2/2023 5:53 AM	Rate (0)
Stefan Arcularius Platinum Expert Joined: 1/21/2013 Last visit: 9/27/2025 Posts: 4132 Rating: (636)	Hi sanjay_das157, I'm not sure I can follow your description. In principle, you do not need to use the topology for most PROFINET applications. However, if you do use it, your real structure must match the configured one. If I remember correctly, this is only reported to the controller and possibly to the direct neighbor. On the application that will require the topology is the use of PROFINET IRT as it is mostly used for drives. I have never tested a scenario similar to the one you describe because in my applications all connected drives were needed and therefore I did not unplug any of them. However, especially when using fast forwarding, I would expect an error on the remaining devices. It would help us volunteers to provide more information if you could describe your configuration, especially in the context of PROFINET IRT and performance upgrade. Kind regards Stefan

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5/2/2023 10:33 AM	Rate (0)
sanjay_das157 Posts: 7 Rating: (0)	We are using Profinet RT. Will the topology [Old Topology View] will workout if we use Profinet RT? We are following the same physical device configuration as in described in Old Topology View picture however we are not sure of the various Topology configuration. When I observed the difference in observation with respect to Old Topology view to New Topology view I assumed some Topology configuration issue only by the logic that when we have no Topology view the scenario works fine. Can you please confirm if we are missing some configuration parameters in Topology view for Old Topology view?
sanjay_das157 Posts: 7 Rating: (0)
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5/2/2023 11:49 AM	Rate (0)
Stefan Arcularius Platinum Expert Joined: 1/21/2013 Last visit: 9/27/2025 Posts: 4132 Rating: (636)	Hi sanjay_das157, I am sorry, but it seems to me that there are some misunderstandings. The Topology View is a graphical editor for the PROFINET topology. It provides an easy way to define the port connections. Using the topology for PROFINET will bring some advantages regarding configuration and diagnostics, and in some cases it will be mandatory to use it, but in most cases you can work without specifying a topology, which allows you to connect the devices in any order. So in your case, since you have specified a topology in your "Old View", you must connect the devices using exactly the topology you configured, otherwise you will get some topology errors. Since there is no topology configured in your "New View", you can connect the devices in any order and no topology error will be reported due to the missing topology. Kind regards Stefan

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5/2/2023 12:53 PM	Rate (0)
sanjay_das157 Posts: 7 Rating: (0)	"must connect the devices using exactly the topology you configured, otherwise you will get some topology errors" Thanks for your reply - can you please explain a little more detail related to "topology errors" - they I assume is probably not the issue as described in my initial post - where we see PLC connect / disconnect issue. Please confirm - if yes then please let me know which configuration parameters to look into if we have a simple daisy chain of drives connected?
sanjay_das157 Posts: 7 Rating: (0)
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