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OPC DA browsing error.

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dastan.zhalilov@erg.kz
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11 Oct 2022 08:26 #11146 by dastan.zhalilov@erg.kz

Replied by dastan.zhalilov@erg.kz on topic OPC DA browsing error.

Different clients: Matrikon OPC Explorer, PsOPCClient and Wonderware Gateway.
These are clients reading without any problem.
Simulation Tags I can read, but Tags from real OPC servers cannot. Network access I already have by PORTS (135-139 TCP ports). Telnet is fine from my application start computer to OPC DA servers.
So, is it possible to solve this problem?

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support
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11 Oct 2022 08:18 #11145 by support

Replied by support on topic OPC DA browsing error.

Hello,
which QuickOPC version are you using please?

Best regards

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dastan.zhalilov@erg.kz
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11 Oct 2022 08:01 #11144 by dastan.zhalilov@erg.kz

Replied by dastan.zhalilov@erg.kz on topic OPC DA browsing error.

Hello Author!

I have almost same problem. I have different OPC servers in my network (WinCC OPC server, Intellution iFIX OPC server, OVATION OPC Server and Cimplicity HMI OPC Server).
I can connect only WINCC and Cimplicity HMI OPC server, but I cannot read Item value. Same error is occuring during read Tag.
I don't understand, Other OPC Clients reading Tags value without any problem.
I try run DemoApplicaion, same result, error.

SO, Developers of OPCLabs, Tell us What reason of your SDK? Why does SDK cannot work with some OPS server?

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dastan.zhalilov@erg.kz
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11 Oct 2022 08:00 #11143 by dastan.zhalilov@erg.kz

Replied by dastan.zhalilov@erg.kz on topic OPC DA browsing error.

Hello Author!

I have almost same problem. I have different OPC servers in my network (WinCC OPC server, Intellution iFIX OPC server, OVATION OPC Server and Cimplicity HMI OPC Server).
I can connect only WINCC and Cimplicity HMI OPC server, but I cannot read Item value. Same error is occuring during read Tag.
I don't understand, Other OPC Clients reading Tags value without any problem.
I try run DemoApplicaion, same result, error.

SO, Developers of OPCLabs, Tell us What reason of your SDK? Why does SDK cannot work with some OPS server?

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support
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18 Jan 2022 08:07 #10549 by support

Replied by support on topic OPC DA browsing error.

Thank you.

Yes, DCOM has to be configured on both sides of the communication. The problem is that the right settings differ a lot, depending on various factors such as the version of the system, authentication approach (user group/domain) etc.

The common approach, if secure environment is available for experiment, is to open the security wide, make it work functionally, and then go back and restrict the security to the desired level. The problem is, however, that it seems that sometimes one cannot make it work even with the widest settings imaginable.

www.opclabs.com/resources/technology-opc/opc-videos/opc-dcom

www.softwaretoolbox.com/dcom/html/configuring_dcom.html

Regards

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yong
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17 Jan 2022 09:21 #10546 by yong

Replied by yong on topic OPC DA browsing error.

Hello

1. Do I need to configure dcom for localhost as well?
I wonder what DCOM configuration should be done.
Is there DCOM configuration manual?

2. QuickOPC 2021.3.

Best regards,

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support
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17 Jan 2022 08:36 #10542 by support

Replied by support on topic OPC DA browsing error.

Hello.

This can be due to multiple reasons, most common being DCOM configuration issues.
It is also important to know - which QuickOPC version are you using?

Best regards

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yong
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10 Jan 2022 07:57 #10535 by yong

OPC DA browsing error. was created by yong

Hello

I'd like to have some information about these below.
- AnotherOPC Client program brings opc data.

- However, I can't get the opc data through the opc library.

* Other clients bring data, but I wonder if it is not possible in the opc library. Some clients have data collection, some don't and I wonder why this problem occurs.
opc server: SchneiderElectric.SCADA.OpcDaServer.1
IP: localhost