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String for Reading PV from Eurotherm 2404

iTools is free to download and use here, but some restrictions apply to unregistered installations. Notably, the opc server will stop serving after 30 mins, and you'll have to restart the client, so you'll have to contact Eurotherm about a license. Communicating between iTools and Labview is easily done using datasocket VIs


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- Cheers, Ed
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Message 11 of 49
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Hi ed,
yes, I found the free download of iTools and I had install. I run the OPC Server and I found my Eurotherm 3508. Now, I will searching the good datasocket VI. Perhaps, you could indicate me which datasocket in the Vi example ? Thanks a lot (I'm not a specialist of communication....sorry...)

Cath
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Message 12 of 49
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I have taken a guess at the address of the Process variable, as I do not have a Eurotherm 3508.

opc:/Eurotherm.ModbusServer.1/ID001-3508.Main.PV

opc:/Eurotherm.ModbusServer - leave as is
1 - the modbus number is hidden away in a settings page somewhere. I can't for the life of me remember where though
ID001-3508 - This ID number and device name is used extensively around iTools when the device is connected.
The rest of the address is the process variable you are interested in. Just browse through the tree structure to find it.




Message Edited by yenknip on 06-23-2008 11:50 AM
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- Cheers, Ed
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Message 13 of 49
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It is also possible to communicate directly with the Eurotherms over Ethernet. Using the NI Modbus Vis. You can download them here:
http://zone.ni.com/devzone/cda/epd/p/id/4756
You have to open a TCP-connection using port 502 and then use the Modbus VIs to read and write registers. The adress of the register can easily be found in iTools. The values in the registers are usually the real value multiplied by 10 but there seem to be exceptions. MBAP Header is usually 0 255.

Best regards,

Thorsten Rissom
Message 14 of 49
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Hello Thorsten,
Thanks you for your answer. I had download
NI Modbus Vis. But I have some question :
1) You said :
"use the Modbus VIs to read and write registers". Is the "MB Registers Manager.vi" or is an other?
2) You said :
"The adress of the register can be easily found in iTools". I'm sorry, but I have some difficult to find theses adresses ....what part of iTools can I use ? : OPC Scope; iTools OPC Server, iTools ? where is the information ?
3) When I create a
TCP-connection like you mentionned, the error next is mentionned...

So, you see, I have some difficult to understand how I'II communicate with my Eurotherm 3508, If you have time to help me, thanks you very much.

Cath


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Message 15 of 49
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Hi Ed,
I tried to make like you explain. When I run my vi, the next error is mentionned :
Do you have an idea where is the problem ?

Thanks you very much
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Message 16 of 49
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