Third party OPC communication

I am trying to establish a communication with Yokogawa DCS. Inorder to achieve the same this is the procedure i followed:

> Created generic OPC Server network on control structure.

> Created Service for the same.

> Performed DCOM settings on both machines i.e. connectivity server on 800xA side and server on yokagawa side.

After performing the DCOM settings, i see that i am able to read the data on 'ADVDSOPCCLIENT' and 'Matrikon OPC Explorer' however the service i created on 800xA is not going to service state.

With respect to the opcda service there two types of behaviour i am observing.

> When i run the service on the node on which i made the DCOM settings the service keeps switching between "undefined" state and "initialize" state such that it is in undefined state for 1 minute and initialize state for 2-3 seconds and this keeps repeating. In this state i am neither able to append the data nor am i able to retrieve the data.

> When i run this service on any other node on which i have not done the DCOM settings the service goes to "initialize" state. Here I am not able to retreive the data . The retrieve fails with the following error message "Error:Failed to change browse position!" "Error: Failed to browse the OPC server: The parameter is incorrect.".

However when i try to append the data, the objects are appended successfully. But still there is no change in service state it remains at initialize and when i subscribe live data i get bad communication error.

Some points to note:

I am receiving data from the yokogawa DCS. There is no data being transferred from 800xA to yokogawa DCS.

800xA version:800xA 5.1 FP4 RevD

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Nishanth Mathew Rank: 324

Asked 3 years ago

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The Matrikon and ABB clients mentioned run as desktop (foreground) users while the OPC DA Connector run in the background as a service.

Some servers display a GUI, which will not work for a client running as a background service.

An OPC tunneler might resolve problems with DCOM and firewalls.

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Stefan Stromqvist AKS expert

Rank: 1

Answered 3 years ago

Matrikon's OPC Explorer is worthless as a real troubleshooting tool other than testing very very basic connections.

Download a (free) copy of Advosol's OPC Security Analyzer from http://www.advosol.com

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Rob Lyon Rank: 2

Answered 3 years ago

The DCOM settings on both the machines are attached here.

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Nishanth Mathew Rank: 324

Answered 3 years ago

There are two important things to be checked in the DCOM settings at the third party server. The authentication at the computer level and the identity at the opcenum and the opc server. If the identity has already been given at the OPC server, create a user with the same user name and password on the 800xA client side and it should start communicating. In my case i overlooked the OPC server identity which was the reason the service i had created on the 800xA side did not go to service. Once i created the same user it worked without any problem. In the case of yokogawa servers you might have difficulty in getting the user name and password however there is an installable file in the yokogawa server which automatically creates the requisite user.

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Nishanth Mathew Rank: 324

Answered 3 years ago

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Third party OPC communication

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