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Profibus node connection status via PLC logic

Created by: kcanoglu at: 1/11/2022 7:30 PM (1 Replies)

1/11/2022 7:30 PM	Rate (0)
kcanoglu Advanced Member Joined: 6/18/2018 Last visit: 5/30/2024 Posts: 30 Rating: (4)	I was able to do this in Simatic manager but never done it with TIA portal yet. Is there a way to detect a node is not connected/ not communicating within the configured Profibus network? It needs to be a PLC logic so I can raise an alarm. I am aware there is diagnostic view from the HMI which we could easily see but it requires local interface. I would like to be able to also notify any remote connection to the PLC there is a problem hence the requirement for PLC logic. I am using TIA portal v16. CPU is 1515-2 Profibus card is CP 1542-5.

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1/11/2022 9:08 PM	Rate (0)
dchartier Grandmaster-Expert Joined: 9/27/2006 Last visit: 11/18/2024 Posts: 12296 Rating: (2691)	Hello Kcanoglu; The CP 1542-5 manual suggests the use of function DPNRM_DG, which is the equivalent of SFC 13 in the Simatic Manager. Here is the link o the equipment manual (see section 5.2): https://support.industry.siemens.com/cs/ww/en/view/76894900 Here is a description of DNRM_DG from the Step 7 and WinCC v16 system manual: https://support.industry.siemens.com/cs/ww/en/view/109773506/87497403659 The following link contains a sample program of DPNRM_DG for a S7-1200 Profibus master (CM 1252-5), which you can adapt to your CP 1542-5. - "With the S7-1200, how do you read out the diagnostics data of a PROFIBUS DP slave with the "DPNRM_DG" instruction and how do you evaluate the data in the user program?" https://support.industry.siemens.com/cs/ww/en/view/66439168 Hope this helps, Daniel Chartier Attachment CP 1542-5 Profibus diagnostics.jpg (553 Downloads)

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