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We appreciate your patience as we improve our online experience.
06-20-2018 03:57 AM
Hello,
Is it possible to implement the Modbus Over UDP protocol in LabVIEW using Data logging and Supervisory Control (DSC) toolkit?
Regards,
S Nagaraju
06-20-2018 04:53 AM
Hello Nagaraju,
Data logging and Supervisory Control (DSC) toolkit proivides only modbus over serial and tcp.
You have to develop your own low level vi's to implement modbus over udp.
You can get more information about modbus over udp from the link below
http://jamod.sourceforge.net/development/udp_master_howto.html
http://jamod.sourceforge.net/development/udp_slave_howto.html
06-20-2018 05:29 AM
Hello Tapan_Mojidra,
Thank you very much for response.
Do you have any example VIs for Modbus Over UDP?
Regards,
S Nagaraju.
06-20-2018 08:01 AM
Hello Nagaraju,
Unlike Modbus/TCP, Modbus/UDP is not covered by a standard. That means there is no standards document which covers how it works and you will need to verify the vendor's implementation. However, here is something which explains it:
http://jamod.sourceforge.net/kbase/modbus_udp.html
I can't of course guaranty that this is how your I/O works.
06-20-2018 08:14 AM
In my understanding, UDP Modbus is almost the same as TCP Modbus, so I would download the old free NI Modbus library at
ftp.ni.com/pub/devzone/epd/nimodbus121.zip
It has been superseded by another library, but in fact it worked well in my applications; furthermore, you are able to manipulate the code.
It's "enough" to replace the TCP part of the code with the corresponding UDP functions.
It should not be an impossible task.
05-28-2019 04:42 AM
@pincpanter ha scritto:
....
It should not be an impossible task.
Hi, I'm sorry, but it did not work for me.
Did anyone actually develope a modbus over udp driver?
Thanks,
Andrea