OPC Items with null reference

I have Kepware opc server connected to ABB 800xa v5.1. My communication is working fine but there is an issue coming Kepware event log (snapshot attached). The error I am receiving in kepware is "Attempt to add item'' failed." which means that the client i.e., ABB OPC client is trying to add items with null item id? But I am unable to find these at the moment. But even if I find them how can I delete them. Since I am unable to delete any tags in control connection?

Screenshot -134-.png

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Waqas_Khan Rank: 130

Asked 4 years ago

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Have you performed upload, or did you create the objects/item IDs manually?

I have not (yet) seen the uploader creating a null item from a non-null item ID returned during upload.

The item ID should be visible in the OPCAdapter Basic log of the AdvDsOPCConnector component in afwapplogviewer.exe tool. Sorry, no manual for this tool - I teach some of the techniques in the E143 Troubleshooting System 800xA expert workshop.

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by Waqas_Khan Rank: 130 on 2/8/2017 10:58:25 AM | Like (0) | Report

Yes it was done by uploader. I will try it myself but Can you please provide some snapshot or pdf of the tool?

by Stefan Stromqvist AKS expert

Rank: 1 on 2/8/2017 11:20:14 AM | Like (0) | Report

Start tool (as admin on any node) using defaults
Select node where connector run
Select AdvDsOPCConnector process
Select Logs
Find OPCAdapter log
Set loglevel to 3
Press Get Messages
Provoke problem
Reset loglevel to 0
Save log messages to file
Open file with eg notepad++
Search/filter
Repeat

by Waqas_Khan Rank: 130 on 2/8/2017 11:46:19 AM | Like (0) | Report

Stefan by provoke problem you mean to simulate the issue or is it some operation function in the log viewer?

by Waqas_Khan Rank: 130 on 2/8/2017 1:05:29 PM | Like (0) | Report

Stefan I got below from log:
"2016-01-09 01:43:31:559#1422, AS-CS-DCS-ESD-1, AdvDsOPCConnector, PID: 3548, Thread: 3324
AdvDsOPCAdapter, Basic, level = 1, Tag =
CItemRecovery::RecoverItems - retrying to add items, count = 7

2016-01-09 01:43:31:560#1423, AS-CS-DCS-ESD-1, AdvDsOPCConnector, PID: 3548, Thread: 3324
AdvDsOPCAdapter, Basic, level = 1, Tag =
CAdvDsOPCServerAdapter::AddItems

2016-01-09 01:43:31:560#1424, AS-CS-DCS-ESD-1, AdvDsOPCConnector, PID: 3548, Thread: 3324
AdvDsOPCAdapter, Basic, level = 2, Tag =
AddItems: 7 items, group (1,41670288)

2016-01-09 01:43:31:560#1425, AS-CS-DCS-ESD-1, AdvDsOPCConnector, PID: 3548, Thread: 3324
AdvDsOPCAdapter, Basic, level = 3, Tag =
(VT_EMPTY): active(1), item(38,0), blob(0/0)

2016-01-09 01:43:31:560#1426, AS-CS-DCS-ESD-1, AdvDsOPCConnector, PID: 3548, Thread: 3324
AdvDsOPCAdapter, Basic, level = 3, Tag =
(VT_EMPTY): active(1), item(39,0), blob(0/0)

2016-01-09 01:43:31:560#1427, AS-CS-DCS-ESD-1, AdvDsOPCConnector, PID: 3548, Thread: 3324
AdvDsOPCAdapter, Basic, level = 3, Tag =
(VT_EMPTY): active(1), item(40,0), blob(0/0)

2016-01-09 01:43:31:560#1428, AS-CS-DCS-ESD-1, AdvDsOPCConnector, PID: 3548, Thread: 3324
AdvDsOPCAdapter, Basic, level = 3, Tag =
(VT_EMPTY): active(1), item(50,0), blob(0/0)

2016-01-09 01:43:31:560#1429, AS-CS-DCS-ESD-1, AdvDsOPCConnector, PID: 3548, Thread: 3324
AdvDsOPCAdapter, Basic, level = 3, Tag =
(VT_EMPTY): active(1), item(51,0), blob(0/0)

2016-01-09 01:43:31:560#1430, AS-CS-DCS-ESD-1, AdvDsOPCConnector, PID: 3548, Thread: 3324
AdvDsOPCAdapter, Basic, level = 3, Tag =
(VT_EMPTY): active(1), item(52,0), blob(0/0)

2016-01-09 01:43:31:560#1431, AS-CS-DCS-ESD-1, AdvDsOPCConnector, PID: 3548, Thread: 3324
AdvDsOPCAdapter, Basic, level = 3, Tag =
(VT_EMPTY): active(1), item(53,0), blob(0/0)"

But the tagname's still empty. What is (item(38,0)? can it help find out?

by Stefan Stromqvist AKS expert

Rank: 1 on 2/8/2017 2:40:08 PM | Like (0) | Report

In the Control Connection Aspect (CCA), OPC tab - what is listed as ID?

Please insert an image or text.

Be sure to begin with no active subscription. Log says retrying which mean item was added before.

If the CCA has no item ID, something must have gone wrong during upload, or null ID was sent by KepWare?

by Stefan Stromqvist AKS expert

Rank: 1 on 2/8/2017 9:39:28 PM | Like (0) | Report

To list currently subscribed properties:
- Select subscribing node & client process in applog
- Select Operations
- Select OPC Communicator Statistics operation
- Enter argument D
- Click Invoke

by Stefan Stromqvist AKS expert

Rank: 1 on 2/8/2017 9:43:12 PM | Like (0) | Report

With client process I mean afwworkplaceapplication, etc - the place the item is requested. Can be a historian, etc as well.

The Connector (on OPC Server node) will report all connected subscribers if you execute the AdvDsOPCConnector Statistics operation.

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Stefan Stromqvist AKS expert

Rank: 1

Answered 4 years ago

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OPC Items with null reference

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