Print document

Technical Forum

Communication / Networks

MODBUS using UDP

Thread Starter: s_vb   Started: 7/27/2012 8:37 AM   Replies: 3

« Previous thread Next thread »
Page 1 of 1 (4 items)
  7/27/2012, 8:37 AM
s_vb
Joined 10/24/2011
Last visit: 5/7/2013
Posts: 68
Rating:
Rated: no ratings [0 out of 5 / rated 0 time(s)]. (0) 
Rated: no ratings [0 out of 5 / rated 0 time(s)]. (0) 
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  (5 Downloads)
Top
  7/27/2012, 11:35 AM
fritz
Joined 10/7/2005
Last visit: 5/20/2013
Posts: 2353
Rating:
Rated: Excellent [4.26 out of 5 / rated 612 time(s)]. (612) 
Users with special expertise supervising conferences
Rated: no ratings [0 out of 5 / rated 0 time(s)]. (0) 
Hello s_vb

you can use the PN port of the CPU for UDP (or TCP and ISO 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 UDP communication (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.
Top
Thank you for this post from:
s_vb
  8/4/2012, 8:28 AM
s_vb
Joined 10/24/2011
Last visit: 5/7/2013
Posts: 68
Rating:
Rated: no ratings [0 out of 5 / rated 0 time(s)]. (0) 
Rated: no ratings [0 out of 5 / rated 0 time(s)]. (0) 
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
Top
  8/6/2012, 10:44 AM
Kaulquappe
Joined 11/27/2007
Last visit: 5/17/2013
Posts: 838
Rating:
Rated: Outstanding [3.86 out of 5 / rated 58 time(s)]. (58) 
Users with special expertise supervising conferences
Rated: no ratings [0 out of 5 / rated 0 time(s)]. (0) 
s_vb wrote:
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
Top
Page 1 of 1 (4 items)
Actions
Copy Link
To conference