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MODBUS TCP PLC (S7-1200) PAC3200 power analyzer - communication error after power off

7/31/2014 12:46 PM	Rate (0)
S.Veselinov Advanced Member Joined: 2/17/2012 Last visit: 3/18/2025 Posts: 21 Rating: (0)	Hello, Very useful information about the MODBUS TCP communication. I have a question though - the communication is running, I get the data I need from a PAC3200 power analyzer but as I unplug the RJ45 plug on the PAC or stop the power of the PLC (S7-1200) sometimes the communication could not be started (the status indicates 7002 or 80C8 or 8200). I tried with the disconnect input bit with no success. We need a stable communication because the place that the system will be implemented is very remote. Is there something I can do to stabilize the communication? I'm using TIA PORTAL V13 UPDATE 3. Thanks. Best Regards
	Last edited by: CS Moderator at: 7/31/2014 1:38 PM new subject after splitting from /tf/WW/en/Posts/61795#top Last edited by: S.Veselinov at: 7/31/2014 12:47 PM
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7/31/2014 2:29 PM	Rate (2)
jklm Platinum Member Joined: 12/22/2006 Last visit: 1/25/2022 Posts: 1742 Rating: (309)	Hello, The PAC3200 accepts, as far as I know, only one connection at a time. When disconnecting the PLC or unpowering it, itwill take some time before the PAC is aware of the connection disruption. This because the PLC did not a clean disconnection sending aTCP FIN (=final) packet.Consequence, as long the PAC still believes that the connection is up, it wil not accept a new PLC connection. On a TCP connection, keep alive telegrams are sent in absence of data. This will be used by the PAC to detect disruption. Depending on the timeout for sending keep alive packetsand acceptable number of lost keep alive packets,it wil last some time... For a PLC the typical values are 10 seconds and 3 repetitions ==> about 30 seconds in total.I do not kown the values for the PAC. So, after a while (when the PAC has detected that the connection is lost), the connectionshould be accepted again.
	Best regards jklm Suggestion was helpful? Feel free to rate it.
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This contribution was helpful to 1 thankful Users S.Veselinov

7/31/2014 2:40 PM	Rate (0)
S.Veselinov Advanced Member Joined: 2/17/2012 Last visit: 3/18/2025 Posts: 21 Rating: (0)	Thanks a lot, it seems I haven't been patient enough.. Best Regards

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2/6/2015 4:33 PM	Rate (0)
Min_Moderator Platinum Member Joined: 9/3/2014 Last visit: 3/13/2019 Posts: 4766 Rating: (122)	New question published by pavloti is split to a separate thread with the subject problem communicating PAC3200 with SCADA software, over modbus TCP protocol. Best regards Min_Moderator

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