MODBUS

[O. Zimmermann]

Bonjour,

I am looking forward to command a MODBUS device (Eurotherm 2208e
Temperature Controller) with LabVIEW. What is it possible to do with
such a device ? Do you have infos, advices, ressources about this, or
MODBUS handling in general ?

oz

[A.S.]

Hello,
It is possible to command a Modbus device with LabVIEW. You will need some sort of OPC server that speaks Modbus. Once you have that, you can use the Datasocket VIs in LabVIEW to communicate with your Modbus device (via the OPC server). If you do not have an OPC server, National Instruments does sell an OPC server that supports Modbus. This OPC server is called the Industrial Automation OPC Server (http://sine.ni.com/apps/we/nioc.vp?lang=US&pc=mn&cid=4584).
So as you can see, the process is not too difficult. Once you have installed the OPC server and configured it to talk to your Modbus device, the Datasocket API in LabVIEW will be able to connect to the Modbus device via the OPC server.

Hope this answers your question. Please let us know if you have
any additional questions on this.

Have a nice day!

A. Saha
Applications Engineering
National Instruments

[Henrik_Volkers]

if you are communication via RS232(485):
there has been a vi for euro. controllers since LV 3.1
that does the the job (or is a good starting point) in the info-labview vi collection.


another is the modbus.llb
here is some info about it:
VI let you communicatie via a serial inerface with Modbus instruments.

PS. No error checking is done in this version; Error clusters only implemented for future use - Users might implement this for their own needs...

This VI is referenced to the Modicon Modbus Protocol as described in the Modicon Modbus Protocol Reference Guide PI-MBUS-300 rev. D

This VI is only tested with a Eurotherm T103 unit controller but should alse work with any other Modbus Instrument.

Maarten van Bree
AIR technical automation,
the Netherlands

[<< email adresses deleted just to prevent the author of the vi from spam>>]
http://www.air.nl

[Olivier-JOURDAN]

To command a ModBus device, you can see this url :
http://www.saphir.fr/FR/produits/pilotes/modbus/index.htm
For the moment is only in french... but you can have more info at this e-mail : support-ModBusVIEW@saphir.fr