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MODBUS using UDP

7/27/2012 8:37 AM	Rate (0)
s_vb Bronze Member Joined: 10/24/2011 Last visit: 3/9/2023 Posts: 257 Rating: (1)	Dear Sir, I am doing modbus communication using UDP connection. I have question that do I need to configure CP (343) card in hardware for Inserting New Connection in Netpro connfiguration? I tried do it without inserting CP in hardware configuration but I am getting error. I have attached error image. I am using CPU 315-2 PN/DP as I am having PN port already in CPU why do I need to configure extra CP for PN port? Please give some guidance on this. Shailesh V. Bangale Attachment error.JPG (104 Downloads)

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7/27/2012 11:35 AM	Rate (0)
fritz Diamond Expert Joined: 10/7/2005 Last visit: 3/17/2025 Posts: 3042 Rating: (1061)	Hello s_vb you can use the PN port of the CPU for UDP (or TCP andISO on TCP) but it will NOT be configured in NetPro. Instead you use so called "Open Communication" which means the connection is configured, established and used via your user program and below are a few links with more on this: How do you program the communication blocks FB67 "TUSEND", FB68 "TURCV", FB65 "TCON" and FB66 "TDISCON" in order to use the UDP protocol for data exchange by means of the integrated PROFINET interface of a CPU? Wizard for creating connection data for open TCP, ISO on TCP or UDPcommunication (Open Communication Wizard). I hope this helps and good luck with your "Modbus on UDP" implementation.
	Cheers fritz The advice and opinion given in this thread is that of the author and does not necessarily reflect the views of I S Systems Pty Limited. To find out how I S Systems can help you with your automation needs please visit www.issystems.com.au.
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This contribution was helpful to 1 thankful Users s_vb

8/4/2012 8:28 AM	Rate (0)
s_vb Bronze Member Joined: 10/24/2011 Last visit: 3/9/2023 Posts: 257 Rating: (1)	Hello Fritz Thanks for information.. I have one question.. Why do we use CP card? What is importance of CP card.. Can you just explain it? Thanks.. Shailesh V. Bangale

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8/6/2012 10:44 AM	Rate (0)
Kaulquappe Posts: 3093 Rating: (324)	s_vb Hello Fritz Thanks for information.. I have one question.. Why do we use CP card? What is importance of CP card.. Can you just explain it? Thanks.. Shailesh V. Bangale Hello Shailesh, you don't need a CP card. Fritz just mentioned that the connection for PN CPUs are not setup in NetPro. Regards, Kaulquappe
Kaulquappe Posts: 3093 Rating: (324)
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