Professional OPC
Development Tools

logos

Can't read or write with TOP Server

More
29 Aug 2017 17:30 #5462 by support
Below is the original post:

I've inherited tests from someone who is no longer with my company. We're using v 5.35.442.1 to connect to a variety of PLCs.

Everything works fine except for a Siemens S7-200. We're using TOP Server v 5.20.396.0.

When the code tries to write, an exception is thrown:
Caught Exception=OpcLabs.EasyOpc.OperationModel.OpcException: An OPC operation failure with error code -2147467259 (0x80004005) occurred, originating from 'OpcLabs.EasyOpcRaw.DataAccess.RawEasyDAClient'.
The inner exception contains details about the problem.
---> System.Runtime.InteropServices.COMException: Unspecified error
--- End of inner exception stack trace --- at OpcLabs.EasyOpc.DataAccess.IEasyDAClientExtension.WriteItemValue(IEasyDAClient easyDAClient, ServerDescriptor serverDescriptor, DAItemDescriptor itemDescriptor, Object value) at TopSrvrTest.Program.SendReset(String opcServer, String resetAddress) in C:\Users\dlaw\Documents\Visual Studio 2015 \Projects\TopSrvrTest\Program.cs:line 20

When attempting to read, no exception is thrown, but the DAVtq variable's HasValue property is always null.

I have a small program that reproduces the issue (and also shows successful reads and writes for a MicroLogix 1400B), but if I attach it, I can't post to the forum.

The code is very simple, however. For writes:
EasyDAClient dac = new EasyDAClient();
dac.WriteItemValue("SWToolbox.TOPServer.V5", ISOTCP.S7_200_58.RESET", true);

For reads:
dac.ReadItem("SWToolbox.TOPServer.V5", "ISOTCP.S7_200_58.VW1920, DAReadParameter.DeviceSource);

Please Log in or Create an account to join the conversation.

More
29 Aug 2017 17:28 #5461 by ifdefelseif
Absolutely! The problem was that the IP address had changed after a power failure and I had to update the network interface for the TOP Server

Please Log in or Create an account to join the conversation.

More
29 Aug 2017 17:23 #5460 by support
Ok Thanks - I was just about to reply.

Next time, can you please keep the original post intact, as that is the purpose of these forums - to facilitate lookup of similar issues and help other users.

Would it be OK if I re-post it here, just for record?

Regards

Please Log in or Create an account to join the conversation.

More
29 Aug 2017 15:11 - 29 Aug 2017 16:54 #5458 by ifdefelseif
Issue resolved. The problem was with the network adapter.
Last edit: 29 Aug 2017 16:54 by ifdefelseif. Reason: Resolved

Please Log in or Create an account to join the conversation.

Moderators: support
Time to create page: 0.176 seconds

      

 Recommend this on Google