cannot get opc da value

[william]

I am trying to read opc da data using scada v6. I can connect to the OPC DA server and add data nodes, but reading the node value failed and the log indicates that access is denied. I used Wireshark to capture traffic and found that there was no username passed in the authentication information. As shown in the following figure.

On the same computer, I can read OPC DA data normally using the “OPC client” software. The authentication information of this software includes the username. As shown in the following figure.

I don’t know why, please help me. thanks.

[Mikhail]

Possible reason is that Communicator works as a service while another app is a desktop application.
You can try setting username, password and domain in the connection parameters of the OPC device.
What is OPC DA specification version?
What is the OPC server you try to connect?

• This reply was modified 1 year ago by Mikhail.

[william]

Thanks for your reply.
The OPC DA specification version is 2.0
The OPC server is a DCS device.
I will go to the factory and give it a try. I will report the results after trying.

[william]

Setting username, password and domain does not work.
The Communicator still cannot read value. The error in the log is E_NETWORK_ERROR.
But connecting in the device properties page can be successful. Perhaps the device properties page like a desktop application and the Communicator is a service.
Are there any other configurations that I can try?

[Mikhail]

Could you copy communication line log here?

[william]

line000.log ：
——————————————————————————–
——————————————————————————–
2023-09-27 12:29:18 Start communication line [0] int0

2023-09-27 12:29:18 Connect to OPCServer.WinCC/{75d00bbb-dda5-11d1-b944-9e614d000000}
2023-09-27 12:29:19 Error connecting OPC server:
E_NETWORK_ERROR
Could not connect to server.

2023-09-27 12:29:19 Delay before connecting 4.4 sec
2023-09-27 12:29:23 Connect to OPCServer.WinCC/{75d00bbb-dda5-11d1-b944-9e614d000000}
2023-09-27 12:29:23 Error connecting OPC server:
E_NETWORK_ERROR
Could not connect to server.

*********************************************
device000.txt ：
[0] dcsda1
———-
Driver : DrvOpcClassic 6.0.0.0
Status : Error
Session time : Undefined
Command time : Undefined

Sessions (total / errors) : 0 / 0
Commands (total / errors) : 0 / 0
Requests (total / errors) : 0 / 0

Current Data
+—+——+——+——-+———+
| # | Code | Name | Value | Channel |
+—+——+——+——-+———+
| ************* opcda ************* |
+—+——+——+——-+———+
| 1 | a1 | a1 | — | |
+—+——+——+——-+———+

***********************************************
ScadaComm.log
——————————————————————————–
2023-09-27 12:29:15 [DESKTOP-KJ7BBFJ][DESKTOP-KJ7BBFJ$][ACT] Communicator 6.1.1.1 started
2023-09-27 12:29:15 [DESKTOP-KJ7BBFJ][DESKTOP-KJ7BBFJ$][ACT] Storage FileStorage 6.1.0.0 loaded from file C:\Program Files\SCADA\ScadaComm\FileStorage.dll
2023-09-27 12:29:15 [DESKTOP-KJ7BBFJ][DESKTOP-KJ7BBFJ$][ACT] Start logic processing
2023-09-27 12:29:15 [DESKTOP-KJ7BBFJ][DESKTOP-KJ7BBFJ$][ACT] Driver DrvDsScadaServer 6.0.1.1 loaded from file C:\Program Files\SCADA\ScadaComm\Drv\DrvDsScadaServer.Logic.dll
2023-09-27 12:29:15 [DESKTOP-KJ7BBFJ][DESKTOP-KJ7BBFJ$][ACT] Driver DrvOpcClassic 6.0.0.0 loaded from file C:\Program Files\SCADA\ScadaComm\Drv\DrvOpcClassic.Logic.dll
2023-09-27 12:29:15 [DESKTOP-KJ7BBFJ][DESKTOP-KJ7BBFJ$][ACT] Data source ScadaServer initialized successfully
2023-09-27 12:29:15 [DESKTOP-KJ7BBFJ][DESKTOP-KJ7BBFJ$][ACT] Data source ScadaServer: Receive the configuration database
2023-09-27 12:29:18 [DESKTOP-KJ7BBFJ][DESKTOP-KJ7BBFJ$][ACT] Data source ScadaServer: The configuration database has been received successfully
2023-09-27 12:29:18 [DESKTOP-KJ7BBFJ][DESKTOP-KJ7BBFJ$][ACT] Start communication lines
2023-09-27 12:29:18 [DESKTOP-KJ7BBFJ][DESKTOP-KJ7BBFJ$][ACT] Start reading commands from files
2023-09-27 12:29:20 [DESKTOP-KJ7BBFJ][DESKTOP-KJ7BBFJ$][ACT] Data source ScadaServer: Connection state is Logged In
2023-09-27 12:35:09 [DESKTOP-KJ7BBFJ][DESKTOP-KJ7BBFJ$][ACT] Stop communication lines
2023-09-27 12:35:14 [DESKTOP-KJ7BBFJ][DESKTOP-KJ7BBFJ$][ACT] All communication lines are stopped
2023-09-27 12:35:14 [DESKTOP-KJ7BBFJ][DESKTOP-KJ7BBFJ$][ACT] Logic processing is stopped
2023-09-27 12:35:14 [DESKTOP-KJ7BBFJ][DESKTOP-KJ7BBFJ$][ACT] Communicator is stopped
——————————————————————————–

[Mikhail]

Try Solution 1 and Solution 2 described at the bottom of this article.

[Mikhail]

This page also may help.

[william]

It’s working! Thank you very much!

[Mikhail]

How did you solve this issue?

[william]

Follow the solution 1 and 2 described in the article you provided.

[Author]

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