modbus tcp

[sales support]

Hi,

The question: Is the communication between a OCS(PLC) and Labview over ethernet, protocol: modbus tcp, possible.
So yes, are their exciting "modbus tcp.VI" and have anybody already test the communication. Because the standard Vi,s of LV only support the lowest level of the communication.

Thx


Thx

[Mads]

I've developed a modbus tcp/ip slave library using those lower level functions of LV (also supports RTU and ASCII modes) so yes, it's quite possible. (I'm thinking of releasing it as shareware but for now we just use it in our own software projects.)

Datasocket is able to use modbus so that's one available solution.

There's some free modbus master libraries lying around too and there are commercial solutions available, including from NI.

Check out these links:

http://digital.ni.com/public.nsf/3efedde4322fef19862567740067f3cc/2cd034f223c650e9862569570041995c?OpenDocument

http://zone.ni.com/devzone/conceptd.nsf/webmain/DF8C0A4BA2E2B22A86256A3700592BEA?opendocument

http://digital.ni.com/alliance.nsf/0/86B40F30917CED74862563B1006E8CDC?opendocument&vid=
niwc&node=123215_US

http://www.ewebsite.nl/eng/html/modbus.html

[Olivier-JOURDAN]

Hi,
ModBus TCP driver for LabVIEW are existing at this URL
http://www.saphir.fr/SAPHIRnet/Admin/home.htm

Try the demo version with PLC