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Technical support is provided through Support Forums below. Anybody can view them; you need to Register/Login to our site (see links in upper right corner) in order to Post questions. You do not have to be a licensed user of our product.

Please read Rules for forum posts before reporting your issue or asking a question. OPC Labs team is actively monitoring the forums, and replies as soon as possible. Various technical information can also be found in our Knowledge Base. For your convenience, we have also assembled a Frequently Asked Questions page.

Do not use the Contact page for technical issues.

Subject Replies / Views Last Post
Read Multiple Data
Category: Reading, Writing, Subscriptions, Property Access
Topic started 15 Jun 2016 04:48, by support
Last Post 15 Jun 2016 04:54
by support
Replies:1
Views:4268
Last Post by support
15 Jun 2016 04:54
Limit on number of records that can be written
Category: Reading, Writing, Subscriptions, Property Access
Topic started 22 Apr 2016 13:16, by bojan
Last Post 11 May 2016 13:50
by support
Replies:8
Views:5533
Last Post by support
11 May 2016 13:50
Initial Subscription invokes TagValueChangedCallback trigger
Category: Reading, Writing, Subscriptions, Property Access
Topic started 14 Apr 2016 10:23, by Damian999
Last Post 14 Apr 2016 14:09
by support
Replies:1
Views:3984
Last Post by support
14 Apr 2016 14:09
Bad CommFailure LimitOk (24)
Category: Reading, Writing, Subscriptions, Property Access
Topic started 11 Apr 2016 10:11, by Damian999
Last Post 11 Apr 2016 18:12
by support
Replies:1
Views:5011
Last Post by support
11 Apr 2016 18:12
Writing an item value (byte) takes different Long times???
Category: Reading, Writing, Subscriptions, Property Access
Topic started 29 Feb 2016 12:50, by tmouslih
Last Post 01 Mar 2016 10:11
by support
Replies:1
Views:4180
Last Post by support
01 Mar 2016 10:11
Failure to receive an update while subscribed
Category: Reading, Writing, Subscriptions, Property Access
Topic started 02 Oct 2014 13:30, by Shea
Last Post 22 Feb 2016 07:11
by support
Replies:5
Views:6142
Last Post by support
22 Feb 2016 07:11
Newbie question: Best method for item identification from callback
Category: Reading, Writing, Subscriptions, Property Access
Topic started 15 Jan 2016 13:47, by Hanssing
Last Post 12 Feb 2016 16:29
by stathej
Replies:16
Views:10.2k
Last Post by stathej
12 Feb 2016 16:29
writing to a kepware item in simulation mode does not seem to work.
Category: Reading, Writing, Subscriptions, Property Access
Topic started 12 Feb 2016 15:15, by giles
Last Post 12 Feb 2016 15:35
by support
Replies:2
Views:4079
Last Post by support
12 Feb 2016 15:35
Newbie Question #2: Concsistent data-transfer
Category: Reading, Writing, Subscriptions, Property Access
Topic started 18 Jan 2016 14:35, by Hanssing
Last Post 18 Jan 2016 16:13
by support
Replies:3
Views:4298
Last Post by support
18 Jan 2016 16:13
MVC Application
Category: Reading, Writing, Subscriptions, Property Access
Topic started 18 Dec 2015 07:54, by support
Last Post 18 Dec 2015 08:00
by support
Replies:1
Views:4191
Last Post by support
18 Dec 2015 08:00
Updates using SubscribeMultipleItems
Category: Reading, Writing, Subscriptions, Property Access
Topic started 03 Dec 2015 11:42, by guidodb
Last Post 03 Dec 2015 16:49
by support
Replies:1
Views:3964
Last Post by support
03 Dec 2015 16:49
subscription onwrites
Category: Reading, Writing, Subscriptions, Property Access
Topic started 03 Dec 2015 11:24, by guidodb
Last Post 03 Dec 2015 16:46
by support
Replies:1
Views:3923
Last Post by support
03 Dec 2015 16:46
Delay in subscription callback acknowledgement
Category: Reading, Writing, Subscriptions, Property Access
Topic started 20 Jul 2015 18:50, by Shea
Last Post 26 Nov 2015 14:31
by Shea
Replies:9
Views:6425
Last Post by Shea
26 Nov 2015 14:31
Error Code -1073419774 (0xC004EA02)
Category: Reading, Writing, Subscriptions, Property Access
Topic started 23 Nov 2015 11:57, by ADaugaard
Last Post 25 Nov 2015 15:56
by support
Replies:3
Views:4438
Last Post by support
25 Nov 2015 15:56
Random disconnect and deadlock when reading items in a loop.
Category: Reading, Writing, Subscriptions, Property Access
Topic started 29 Apr 2013 13:14, by Jarimatti
Last Post 08 Oct 2015 10:33
by support
Replies:9
Views:7501
Last Post by support
08 Oct 2015 10:33
occasional errors in the OPC tag subscription from the remote OPC server
Category: Reading, Writing, Subscriptions, Property Access
Topic started 07 Oct 2015 12:38, by saravana48
Last Post 08 Oct 2015 10:29
by support
Replies:1
Views:5339
Last Post by support
08 Oct 2015 10:29
Exception for No Quality Data in Server Response
Category: Reading, Writing, Subscriptions, Property Access
Topic started 24 Sep 2015 08:21, by fabio.bellani
Last Post 29 Sep 2015 14:11
by fabio.bellani
Replies:5
Views:5108
Last Post by fabio.bellani
29 Sep 2015 14:11
Cannot connect Data Access client (timeout) while writing values to tag/item
Category: Reading, Writing, Subscriptions, Property Access
Topic started 03 Sep 2015 13:30, by saravana48
Last Post 08 Sep 2015 13:48
by support
Replies:12
Views:9823
Last Post by support
08 Sep 2015 13:48
Reading multiple variable values, timing and synchronization in respect of OPC Server
Category: Reading, Writing, Subscriptions, Property Access
Topic started 15 Aug 2015 20:54, by Alexander
Last Post 01 Sep 2015 16:02
by support
Replies:3
Views:5458
Last Post by support
01 Sep 2015 16:02
Very slow periodic WriteItemValue() calls
Category: Reading, Writing, Subscriptions, Property Access
Topic started 08 Sep 2014 13:20, by athyssen
Last Post 10 Aug 2015 19:34
by support
Replies:15
Views:11.1k
Last Post by support
10 Aug 2015 19:34
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