Exception when connecting to RSLinx server: class not registered

[sanzor]

Hello, I am trying to connect to an RSLinx server with Titanium and i get the following exception:

**An unhandled exception of type 'System.Runtime.InteropServices.ExternalException' occurred in TitaniumAS.Opc.Client.dll

Additional information: CoCreateInstanceEx: Class not registered**

Is RSLinx not supported?

[iceoneye]

the same as you

[alexey-kachalov]

Hi! Have you already tried the same program on Matrikon?

[sanzor]

I do not posess Matrikon.

[alexey-kachalov]

@sanzor , I meant that you can try you program with MatrikonOPC Explorer/MatrikonOPC Simulation Server (https://www.matrikonopc.com/products/opc-drivers/opc-simulation-server.aspx) first. The TitaniumAS.Opc.Client library should work with it.

[sanzor]

Well i am using Allen Bradley hardware with RSLinx server that is why i was interested if it is supported.I am sorry i shouldn't have placed this question at "Issues" ,more like at questions.

[alexey-kachalov]

@sanzor, it is ok. :) The TitaniumAS.Opc.Client intends to work with all OPC DA servers with versions 1.0, 2.05A, 3.0. But sometimes it cannot work with particular OPC DA servers, because of the implementation specifics of the OPC DA server. To make it clear, that your problem connected with the RSLinx, TitaniumAS.Opc.Client or your client program, try the program with MatrikonOPC Explorer/MatrikonOPC Simulation Server. If it works, the problem with the communication between the TitaniumAS.Opc.Client and RSLinx.

[iceoneye]

I've tried before. Other opc clients,such as Matrikon-OPCClient,Kepware-OPCClient, etc. can read RSLinx OPC server.

[sanzor]

I am currently using OPC .Net Foundation version for OPC.DA with RSLinx and it is working.Unfortunately the classic OPC DA does not provide PLC tag mapping.I need at runtime to get all the datastructures declared inside the PLC program (not the values ,the tag-schema).I don't know how to do that and Titanium's autobrowse function looked perfect for what i needed.

[imphat]

I have the same problem. On my local machine (windows 7) I am running a Matrikon emulator and it works just fine, but when I deploy to an RSLinx Windows 2012 machine, I get the same error.

[alexey-kachalov]

It seems we should look into RSLinx interaction.

[sfaulkner]

I might know why this happens, the RSLinx OPC Server has spaces in the name where the Matrikon and Citect ones do not, that is the only thing I can find different about why the RSLinx one fails. When I use the overload to pass GUID and hostname (after finding the RSLinx OPC Server GUID in the Registry) it does connect. Unfortunately you can't change the name of the RSLinx OPC Server from what I've found.

[ThePhilomathsApprentice]

@sfaulkner can you please elaborate on how to find the GUID of RSLinx. I am facing the same issue.

[sfaulkner]

@ThePhilomathsApprentice I don't have the code to verify this anymore but I believe the key is located at Computer\HKEY_CLASSES_ROOT\RSLinx OPC Server\CLSID. Hope that helps.

[ThePhilomathsApprentice]

Resolved it using Matrikon Explorer GUI: -Connect to the server using Matrikon explorer. -Right click on the server Name. -Click Properties. -GUID is written there: {}

[xjbob]

I do not posess Matrikon.

it support “Matrikon” and “Kepware.KEPServerEX.V6”，i use 。but “RSLinx OPC Server” and “National Instruments.NIOPCServers.V5” same problem as you。

[xjbob]

I might know why this happens, the RSLinx OPC Server has spaces in the name where the Matrikon and Citect ones do not, that is the only thing I can find different about why the RSLinx one fails. When I use the overload to pass GUID and hostname (after finding the RSLinx OPC Server GUID in the Registry) it does connect. Unfortunately you can't change the name of the RSLinx OPC Server from what I've found.

how to "overload to pass GUID and hostname " i wirte code as" OpcDaServer server = new OpcDaServer(UrlBuilder.Build("RSLinx OPC Server")); or OpcDaServer server = new OpcDaServer(UrlBuilder.Build("{A05BB6D5-2F8A-11D1-9BB0-080009D01446}")); " not work

but code as " OpcDaServer server = new OpcDaServer(UrlBuilder.Build("A05BB6D5-2F8A-11D1-9BB0-080009D01446")); “ it work

problem is progid "RSLinx OPC Server" has space character？