Eurotherm EPower controller: query problem

Hello

I have a problem with communicating with a controller Eurotherm EPower (with 4 units) by OPC server.

I use:

-LV 8.5.1

-iTools OPC Server 7.50 with a number of product formed the social reason (active license)

-EPower Firmware v3.01

Communication between LV and OPC server is made by "DataSocket write" and "Read DataSocket".

I can write => values without problem I only write Main.SP on the evolution of events user and everything's fine.

But on reading, I would like to read Meas.I Meas.P, Meas.V, continuous for each unit (up to 12 url request)

The first reading is ok, so I have values, the url are ok. But after that, it is impossible to put in a loop-online no error, (status = 0 on LV and OPC Server) but the values are not updated with the following query.

I tried to play with the option "wait for updated value", but without success.

The only way I've found is to open the interface for server, the device, right click and select "Synchronize Active device". But this option is only a shot and very long because, I guess, he gets everything in the device...

Another point: it works perfectly with the Engineering Studio, commonly called iTools-iTools. It is a client of the OPC server on my application.

Another point on the other: when I run my application is the ID_EPower.exe in the list of Windows processes and consume resources (0 or 1%) so he lives.

Complete, with one hour, I thank them but not way with Eurotherm hotline.

My question is: Y at - it a particular way to obtain ongoing measures such as sending a query each time or a general property to get updated data?

I used to cruise control disc from the same manufacturer with no problem and no need to send a request to get the values, but here it is perhaps a different case.

List of requested URL:

OPC:/Eurotherm.ModbusServer.1/CLA_Gradateurs.192-168-1-222-502-ID001-ePower.network.1.MEAs.V

OPC:/Eurotherm.ModbusServer.1/CLA_Gradateurs.192-168-1-222-502-ID001-ePower.network.1.MEAs.I

OPC:/Eurotherm.ModbusServer.1/CLA_Gradateurs.192-168-1-222-502-ID001-ePower.network.1.MEAs.P

OPC:/Eurotherm.ModbusServer.1/CLA_Gradateurs.192-168-1-222-502-ID001-ePower.network.2.MEAs.V

OPC:/Eurotherm.ModbusServer.1/CLA_Gradateurs.192-168-1-222-502-ID001-ePower.network.2.MEAs.I

OPC:/Eurotherm.ModbusServer.1/CLA_Gradateurs.192-168-1-222-502-ID001-ePower.network.2.MEAs.P

... Ditto for network 3 and 4

I joined the part of the code that is dedicated for the reading of values, but it is not really helpful because I think that my method of reading is correct (data arrive but are never updated) is a 'lack' of command to request that the server acquires new data or a bug with the LV-iTools OPC server interface...

For LabViewers advanced, I know that my attached code is not optimized and not the smartest, but keep cool, I do not need crazy performance

Any suggestion?

So, I was not on the spot for the tests, but now it's ok.

Several series shares have been made to the walkthrough to the problem, but it's hard to know if all were beneficial:

-An update of software Eurotherm: 7.50 to 7.68

-An update of the firmware EPower: 3.01 to 3.03

- and probably the main cause of the problem: change the cable through a cross-wired (we thought it was, but not in reality...). But even if it is the main cause: how it was possible to receive data by forcing the update in the OPC server... strange.

Thanks for your help.

Tags: NI Software

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