OPC Foundation Message Board

Failure to handle currency and array types

asthomas — Wed, 10 Mar 2010 14:38:27 GMT

Using the Generic Client, I can successfully observe scalar data types with the exception of the VT_CY (currency) type. In the Generic Client's server view it lists a currency type value as "System.TimeSpan".

I am unable to get any array type to work. For example, if the OPC DA server contains a value of type VT_R8 | VT_ARRAY, the generic client is able to subscribe to the item, but it displays the item as "0" instead of an array. I can see that the values are arriving, as the "Updates Recvd" column is rising. Is this a display issue, or is the Xi release candidate unable to handle array types?

Andrew

Visual Studio 2010 uses .Net Framework 4.0

asthomas — Wed, 10 Mar 2010 13:38:09 GMT

Just FYI if anybody is building OPC Xi with VS2010, you need to change all of the project target frameworks to .NET Framework 4. If you do not, then you will not be able to use the DLL produced by the Xi OPC COM Impl project with your C# projects.

VS2010 does not allow you to select the target .NET framework for a C++ application, for reasons that are not clear to me. If anybody discovers otherwise, please let me know.

Andrew

Exception when PNRP not available

asthomas — Wed, 10 Mar 2010 13:12:00 GMT

Environment: Visual Studio 2010
Project: Xi Common Support VS2008
Executing Xi ServiceHost DiscoveryServer ConsoleApp VS2008

PNRPHelper.cs:70
In the function RegisterService, line:
PeerName pName = new PeerName(meshName, PeerNameType.Unsecured);

If PNRP is not available, this line throws the error:
"P2P is not available"

It looks like this code has to be moved inside the try {} block.

RE: Create Instance failed: 0x80080005 with Windows 7

VMugnier — Wed, 10 Mar 2010 09:43:37 GMT

Thanks for your answer.

We use our own OPC server developped with the Wintech OPC source code kit.
It is not running as a service.
The application server is already running when I try to connect to it.

I've just done a new test with the following parameters :
- Windows defender disabled.
- UAC turned to "never notify"
I still have the 0x80080005 error and the message "The user must have DCOM server launch rights."

Here is the whole diagnostic of the OPC Security Analyzer :

Code:

Diagnose access to OPC server 'OPC Kronos' on machine 'TEST-WINDOW7'. Running on machine 'PC-VINCENT' as user ''PC-VINCENT\Vincent Mugnier''.
The interactive user is PC-VINCENT\Vincent Mugnier
DCOM is activated on machine 'PC-VINCENT'.
The Registry could be read on machine 'TEST-WINDOW7' using the 'Remote Registry' server.
DCOM is activated on machine 'TEST-WINDOW7'.
No shared drive available or accessible
This is not necessarily an error. Maybe the remote machine has no shared drives
or the user 'PC-VINCENT\Vincent Mugnier' doesn't have access rights. You may need to run this application
on the target machine to test the file access locally
Analyzer could connect to Registry on machine 'TEST-WINDOW7'.
The server description is 'OPC Kronos'.
The server CLSID is '{2d1b6b4a-a637-470c-8150-c63f9f8f6263}'.
The server EXE is 'C:\Program Files\Rotronics\Kronos 4.0\Kronos.exe'.
The server AppID is '{2d1b6b4a-a637-470c-8150-c63f9f8f6263}'.
No AppID registry entry found for 'Kronos.exe'.
This server has no security definitions configured. It could be that the short filename is registerd.
The server EXE directory '\\TEST-WINDOW7\C\Program Files\Rotronics\Kronos 4.0' is not shared or not readable from user PC-VINCENT\Vincent Mugnier
This is not necessarily an error. Maybe the directory is not shared
or the user 'PC-VINCENT\Vincent Mugnier' doesn't have access rights.
You may need to run this application on the target machine to test the file access locally.
The EXE file must be accessible from the local user 'PC-VINCENT\Vincent Mugnier'.
The user 'PC-VINCENT\Vincent Mugnier' must have DCOM server launch rights.

I can remotly connect to a different server - Matrikon OPC Server - and I've also the following message :

Code:

No shared drive available or accessible
[...]
The server EXE directory '\\TEST-WINDOW7\C\PROGRA~1\Matrikon\OPC\SIMULA~1' is not shared or not readable from user PC-VINCENT\Vincent Mugnier

Is the indication "No AppID registry entry found for 'Kronos.exe'." suspect ? Even if I've the same with Windows XP but it never was a probleme...

RE: accessLevels of node.

Randy — Wed, 10 Mar 2010 07:17:55 GMT

Code:

#define OpcUa_InitializeArray(xArray, xLength, xType) { int ii; for (ii = 0; ii < xLength; ii++) { xType##_Initialize(&((xArray)[ii])); } }

#define OpcUa_ClearArray(xArray, xLength, xType) { int ii; for (ii = 0; ii < xLength; ii++) {    xType##_Clear(&((xArray)[ii])); } }

void ClientSession::BeginReadValue(OpcUa_NodeId nodeId, PfnClientSession_OnReadValue* pCallback, OpcUa_Void* pCallbackData)
{
OpcUa_RequestHeader tRequestHeader;
OpcUa_ReadValueId tNodesToRead[2];
OpcUa_ResponseHeader tResponseHeader;
OpcUa_Int32 nNoOfResults = 0;
OpcUa_DataValue* pResults = NULL;
OpcUa_Int32 nNoOfDiagnosticInfos = 0;
OpcUa_DiagnosticInfo* pDiagnosticInfos = NULL;

OpcUa_InitializeStatus(OpcUa_Module_Client, "ClientSession::ReadValue");

OpcUa_RequestHeader_Initialize(&tRequestHeader);
OpcUa_ResponseHeader_Initialize(&tResponseHeader);

for (int ii = 0; ii < 2; ii++)
{
   OpcUa_ReadValueId_Initialize(&tNodesToRead[ii]);
}

// select attribute.
tNodesToRead[0].NodeId = nodeId;
tNodesToRead[0].AttributeId = OpcUa_Attributes_AccessLevel;

tNodesToRead[1].NodeId = nodeId;
tNodesToRead[1].AttributeId = OpcUa_Attributes_UserAccessLevel;

// fill in request header.
tRequestHeader.TimeoutHint = UTILS_DEFAULT_TIMEOUT;
tRequestHeader.Timestamp = OpcUa_DateTime_UtcNow();
tRequestHeader.AuthenticationToken = Utils::Copy(&m_tAuthenticationToken);

ReadAsyncCallbackData* pData = new ReadAsyncCallbackData();

pData->pClientSession = this;
pData->pCallback = pCallback;
pData->pCallbackData = pCallbackData;

// create the ClientSession.
uStatus = OpcUa_ClientApi_Read(
   m_channel.GetHandle(),
   &tRequestHeader,
   0,
   OpcUa_TimestampsToReturn_Both,
   2,
   tNodesToRead,
   &tResponseHeader,
   &nNoOfResults,
   &pResults,
   &nNoOfDiagnosticInfos,
   &pDiagnosticInfos);

if (OpcUa_IsBad(uStatus))
{
OpcUa_GotoError;
}

if (OpcUa_IsBad(tResponseHeader.ServiceResult))
{
uStatus = tResponseHeader.ServiceResult;
OpcUa_GotoError;
}

if (nNoOfResults != 2)
{
uStatus = OpcUa_BadUnknownResponse;
OpcUa_GotoError;
}

// clean up.
OpcUa_RequestHeader_Clear(&tRequestHeader);
OpcUa_ResponseHeader_Clear(&tResponseHeader);
OpcUa_ClearArray(tNodesToRead, 2, OpcUa_ReadValueId);
OpcUa_ClearArray(pResults, nNoOfResults, OpcUa_DataValue);
OpcUa_Free(pResults);
OpcUa_ClearArray(pDiagnosticInfos, nNoOfDiagnosticInfos, OpcUa_DiagnosticInfo);
OpcUa_Free(pDiagnosticInfos);

return;

OpcUa_BeginErrorHandling;

// clean up.
OpcUa_RequestHeader_Clear(&tRequestHeader);
OpcUa_ResponseHeader_Clear(&tResponseHeader);
OpcUa_ClearArray(tNodesToRead, 2, OpcUa_ReadValueId);

if (pResults != NULL)
{
   OpcUa_ClearArray(pResults, nNoOfResults, OpcUa_DataValue);
   OpcUa_Free(pResults);
}

if (pDiagnosticInfos != NULL)
{
   OpcUa_ClearArray(pDiagnosticInfos, nNoOfDiagnosticInfos, OpcUa_DiagnosticInfo);
   OpcUa_Free(pDiagnosticInfos);
}

throw StatusCodeException(uStatus, "Could read value from server.");
}

RE: accessLevels of node.

Naresh — Wed, 10 Mar 2010 06:20:13 GMT

Hi Randy,

I used this function but not able to find, how to retrieve access level of a node.

uStatus = OpcUa_ClientApi_Read(
m_channel.GetHandle(), &tRequestHeader, 0, OpcUa_TimestampsToReturn_Both, 1, &tNodesToRead, &tResponseHeader, &nNoOfResults, &pResults, &nNoOfDiagnosticInfos, &pDiagnosticInfos);

Out of all the out parameters, i am not getting the access level of the node in any one. My requirement is to before read/write, i need to find that given node can be read/write.

In case of .net. It can be done by using the following code.

INode node = this.session.ReadNode(nodeId);
VariableNode varNode = node as VariableNode;
if (varNode != null)
{
varNode.AccessLevel;
}

Is above thing is not possible in C++? until now i didn't find any api in opcua_clientapi.h file to do it.

Please help me in this regard.

Thanks,
Naresh

RE: Historical Data Access using OPC UA specification

Randy — Tue, 09 Mar 2010 21:53:46 GMT

Historial Events is a new feature in UA.

If you want to develop a UA HA client application then the HDA wrapper is all you need. An UA HA client cannot tell if UA server is wrapping a COM server or if it is a native implementation.

You can add the HDA wrapper component to the UA Sample Server by adding the appropriate entries into the config file and creating the NodeManagers by overriding the CreateMasterNodeManager() method.

Example code is in Source\ComInterop\Common\Client\ComWrapperServer.cs

RE: OPC for Sepam / Modbus TCP

DanMuller — Tue, 09 Mar 2010 20:52:59 GMT

You might want to take a look at Cyberlogic's MBX OPC Server. While we perform synchronous communication, we also open multiple sockets to allow simultaneous communication. This may get you what you need even though it's not precisely what you're asking for.

We'd be happy to discuss your needs. Please contact us at techsupport@cyberlogic.com.

Dan Muller
Cyberlogic

RE: Historical Data Access using OPC UA specification

rajeev.kansal@sap.com — Tue, 09 Mar 2010 18:21:19 GMT

Hi Randy,
In OPC UA historical access, I read about reading historical Events also which I didn't find in OPC HDA specification. is this something newly added in OPC UA Historical access? Please let me know.

Regarding HDA Server, we don't intend to create a HDA server implemtation.
We have a current implementation to read current values for varaiable against OPC UA sample server using OPC UA data access specification. We want to extend this implementation to read the history values also. When would be the OPC UA HA server implementation be finished?
Best Regards,
Rajeev

RE: Create Instance failed: 0x80080005 with Windows 7

Randy — Tue, 09 Mar 2010 16:23:51 GMT

Windows 7 always has User Access Control enabled (UAC).
This will create problems for applications that try to update the registry on start.

RE: accessLevels of node.

Randy — Tue, 09 Mar 2010 16:22:47 GMT

The Server Object exposes the SecondsTillShutdown and ShutdownReason properties. Clients use these to check if the server is shutting down. Clients can subscribe for changes to receive notifications when a Server shutdown starts.

You need to use the OpcUa_ClientApi_Read method to fetch the AccessLevel and UserAccessLevel attributes for a Node.

RE: How does a client find nodes with wildcards?

Randy — Tue, 09 Mar 2010 16:14:23 GMT

UA does not support wildcards during browse.
If you wish to search based on a path (with no wildcards) you use the TranslateBrowsePathsToNodeIds service.
The Browse service allows you to walk through the address space by following one reference at a time.

To implement your examples:

1) a/b/c/*

Call TranslateBrowsePathsToNodeIds (pass a/b/c)
Call Browse with the results returned from TranslateBrowsePathsToNodeIds

2) a/*/b/d

Call TranslateBrowsePathsToNodeIds (pass a/)
Call Browse with the results returned from TranslateBrowsePathsToNodeIds
Call TranslateBrowsePathsToNodeIds (pass b/d and each NodeIds returned in Browse)

Code examples are in the Quickstarts.
The InformationModel (Bolier) Client
BoilerCB_SelectedIndexChanged

RE: Create Instance failed: 0x80080005 with Windows 7

Fred_Loveless — Tue, 09 Mar 2010 15:13:10 GMT

What OPC Server are you using?
Are you runing as a service or on the desktop?
What are your UAC and Windows Defender settings?

These are good questiosn to start with, we may have more once we get answers to these.

Fred Loveless
Kepware Technologies

RE: accessLevels of node.

Naresh — Tue, 09 Mar 2010 14:54:10 GMT

Hi all,

I need urgent help in this regard. I am still not able to find any way to retrieve accesslevel of any given node.

Thanks,
Naresh.

How does a client find nodes with wildcards?

j.vanderven@magion.nl — Tue, 09 Mar 2010 14:52:34 GMT

Dear list,

I know this sounds like a simple question, but I have been struggling with it for quite some time now.

How do you code the client to look for nodes using wild cards?

I would like to be able to do this:
1) a/b/c/*
2) a/*/b/d

I think I should do #1 with Channel.Browse(NodeId(a/b/c), but I have no clue on how to handle the second case.

Are there any samples covering this? If so, where are they?

I am writing a java client, but any examples in C# are just as appreciated. Thanks in advance.

Kind regards,

Jan

Create Instance failed: 0x80080005 with Windows 7

VMugnier — Tue, 09 Mar 2010 14:42:49 GMT

Hello,

We have our OPC server and we use it without any problem under Windows XP. But with Windows 7, it is impossible to connect remotly to it, we always have this message (see subject). In local, no problem.

We have the same installation as with Windows XP with the same OPC, DCOMCFNG config, same user...

When we try to connect to our server with Advosol OPC Security Analyzer, it says that "The user must have DCOM server launch rights."

What is different between Windows XP and 7 about that ?

thanks

RE: Historical Data Access using OPC UA specification

Randy — Tue, 09 Mar 2010 02:25:10 GMT

The HDA server is used because it was a working archiver.

I am working on a pure UA HA server quickstart now.

If you want to understand how to write your own HA server you can look in the COM Interop Library. You will find the implementation of the HDA COM wrapper. You would replace that with code that accesses your own database.

Historical Data Access using OPC UA specification

rajeev.kansal@sap.com — Mon, 08 Mar 2010 22:51:45 GMT

Hi,
I was comparing OPC HDA specification and OPC UA Histroy data access specification and felt that OPC UA HDA has functionality to read the history events also whereas in OPC HDA specification it was only for reading history data. Is this a fair statement?

I need to develop a client application reading the OPC UA history values. For development/testing purpose, is it not possible just to work with OPC UA Server? Is it must to install OPC HDA server also?

Best Regards,
Rajeev

accessLevels of node.

Naresh — Mon, 08 Mar 2010 20:45:11 GMT

Hi all,

I have two questions.

1) In .net client, i am able to find the access level of the node before performing any operation on it like read/write.
But in case of the C++ client, i am not able to find the API to achieve the same?

2) How the client will get the Shutdown request from the server when server gets shutdown, not able to find any call back?

Thanks,
Naresh.

RE: Using OPC DA Wrapper 2.02 with C#

Michel — Mon, 08 Mar 2010 15:09:19 GMT

Hello,
With .Net applications OPC .Net API is clearly more efficient.

1- Let's say with the .Net API you'll ahve less software layer to go through.
In OPC .Net app using Auto Wrapper
Your App-->Automation-->..Net-->COM Interop-->OPC COM Server
In OPC .Net app using .Net API
You App-->COM Interop-->OPC COM Sever
2-OPC .Net API allows you to create DA, AE, HDA, DX, XML DA etc. All with security support.
3- OPC .Net API is provide and specify by the OPC Foundation

For my point of view. The OPC .Net API is the best choice for OPC Client dev in .Net world.

Regards,
Michel

RE: Using OPC DA Wrapper 2.02 with C#

ndeckard — Mon, 08 Mar 2010 14:59:27 GMT

Michel,

Thanks for the reply. To answer your question, I am not to familiar with OPC .Net API. I have used the automation wrapper in some vb6 apps and I wanted to do the same using c#. Would using the api be easier and more efficient? I am learning this opc stuff on my own and I am not a OPC memeber. Is there any documentation or examples I can learn from?

Regards,
Neal

RE: OpenSSL dll's for wince(MIPS2).

mayankg — Mon, 08 Mar 2010 09:57:56 GMT

Has someone compiled the OpenSSL for MIPS2? We tried the same but there many structures used not available in MIPS2 SDK.

RE: ExtensionObject and ANSI-C stack

mayankg — Mon, 08 Mar 2010 09:50:41 GMT

The problem might be, when the memory is allocated for

Code:

Response.Results[0].Value.Value.ExtensionObject->Body.EncodeableObject.Object = OpcUa_Alloc(sizeof(OpcUa_ServerStatusDataType));

It hasnt been intialized. As these structures have many pointers which if not set NULL, they will be accessed by the stack.

RE: DA 2.05a CTT - Contradiction,Bugs and Optional Interfaces

Matthias Isele — Mon, 08 Mar 2010 08:40:08 GMT

Maybe I was not clear on this. I don't refer to the status code (the HRESULT returned for the call) but the ppErrors array (HRESULT for each itemID).
Please check again all entries in the ppError array.

RemoveGroup:
I think the problem is that some group has not been removed correctly. Then the client (CTT) tries to add a group with the name that already exists and you get the error OPC_E_DUPLICATENAME.

Quote:

�After checking for OPC_S_INUSE all references are released and the group will be removed automatically by the server.�:

The server marks the group as "deleted". Any further calls to the group will return E_FAIL. The server releases it's own references to the group i.e. once the client releases it's references the group will automatically be deleted.

RE: Examples of UA in embedded devices?

Michel — Sun, 07 Mar 2010 08:56:11 GMT

Hello,
it seems that beckhoff do the in a PC Based controller. Detail http://beckhoff.com/english.asp?press/pr1608.htm
There are also commercial toolkit for VXWorks and CE that will help in UA implementation in Embedded device.

Regards,
Michel

RE: ExtensionObject and ANSI-C stack

Michel — Sun, 07 Mar 2010 08:52:42 GMT

Hello,
Did you find a solution to your problem ?
Regards,
Michel

RE: Browse servers: Interface not registered

Michel — Sun, 07 Mar 2010 08:49:20 GMT

Hello,
I suggest you check the following :
- Installation of the server
- Installtion of core components
- DCom Setting for remote access

Wish it help,
Michel

RE: Using OPC DA Wrapper 2.02 with C#

Michel — Sun, 07 Mar 2010 08:39:43 GMT

Hello,
just a related question.
Why do you want to use the Automation wrapper instead of the OPC .Net API ?

Regards,
Michel

OPC UA SDK 1.01 COM Interop source code

Michel — Sun, 07 Mar 2010 08:36:17 GMT

Hello,
The OPC Foundation release the OPC UA SDK 1.01 COM Interop Components. It contains easy to use proxy and wrapper to use OPC COM and OPC UA together.
But where is the source code of the Wrapper ?

Regards
Michel

RE: OPC UA Security Specification compliance with TLS

Randy — Sun, 07 Mar 2010 01:08:03 GMT

UA relies on different technology mappings to provide security.

There are currenly two official mappings:
UA Secure Converation with UA TCP and WS-Secure Conversation

There will be a third official mapping that uses TLS 1.2.

TLS did not make the first release because the Windows implementation on XP would have forced UA to adopt obsolete cryptography algorithms and the minimum required technology. There was also a considerable technical risk since UA applications would have to share security configuration with Internet Explorer and that could result in mutually contradictory security requirements.

OPC UA Security Specification compliance with TLS

eoursel — Sat, 06 Mar 2010 19:28:17 GMT

I would like to know how the OPC UA Secure Conversation (as explained in the part 6 of the specification, using UA TCP) is related to TLS. Is it compliant with TLS? Especially with the last version which is TLS 1.2?

Regards,

RE: trouble connecting clients to server

rafaeltn — Fri, 05 Mar 2010 23:29:29 GMT

i haven't installed it yet.... i will search the download link

RE: trouble connecting clients to server

Randy — Fri, 05 Mar 2010 23:20:47 GMT

If you have installed the Test Applications the UA Configuration Tool is accesible from the Programs Menu under the OPC Foundation Folder

RE: trouble connecting clients to server

rafaeltn — Fri, 05 Mar 2010 22:08:40 GMT

thanks randy!!!

im trying to run the UA Configuration Tool, but i can't do it, shows me a error: "the referenced assembly (...\ConfigurationTool\Common\Bin\Debug\Opc.Ua.Configuration.dll) was not found" when I try to build the solution in VS, I guess thats because the other solutions are not builded yet, but i can't build any solution in the folder ...\UA SDK\v1.0\Samples\Source\Utilities

I'm almost sure that if I can do all these thing in the UA Configuration Tool, the clients will work fine....

RE: monitored item quality when a server is not available anymor

Randy — Fri, 05 Mar 2010 17:20:56 GMT

Please add a Mantis issue.

RE: Difference between OPC and OPCUA functionalities.

Randy — Fri, 05 Mar 2010 17:18:38 GMT

Part 9 has an Appendix that describes the COM AE mapping.

The mapping for DA is straight forward:

Browse -> Browse
Item -> Variable
Property -> Property/Attribute
Branch -> Folder
Read -> Read
Write -> Write
Group -> Subscription
Group Item -> MonitoredItem

There are no AsyncIO calls in UA.
The client APIs allow for non-blocking calls.

This needs to be written up as an appendix for Part 8

RE: trouble connecting clients to server

Randy — Fri, 05 Mar 2010 17:13:06 GMT

The network stack should not break connections to the current machine if the cable is unplugged. I have not seen that behavoir in my testing.

The sample server can be started from the service control panel app.

You need to add the client certificate to the server trust list.
You can do this with the UA Configuration Tool.

After you connect with the client once with security it will be rejected.
If start the UA Configuration Tool
Select the "Certificate Stores" tab
Select the "Favorites" folder
Select "%CommonApplicationData%\OPC Foundation\RejectedCertificates"
Find the client certificate.
Select it, right click copy.
Select LocalMachine\UA Applications
Right click Paste
The Server should not trust the client.

RE: Maximun Items per subscription

Randy — Fri, 05 Mar 2010 17:06:40 GMT

There is no limit to the number of items or the number of notifications in the specification. There are practical limits depending on the implementation of the client or server.

There are two versions of the UA SDK

Released v1.0 Build 250
Beta v1.1 Build 310

Both are fairly stable.

Build 250 is released so patches are only applied when absolutely necessary and never change the public interfaces.
Build 310 is beta so updates may change public interfaces.

If you have issues with memory leaks please report the details.

RE: DA 2.05a CTT - Contradiction,Bugs and Optional Interfaces

jal — Fri, 05 Mar 2010 15:35:16 GMT

No I was not returning any kind of error code and even during debugging I could able to see only S_OK returned. I am sure that this error code was coming from CTT.
I spot the problem and found that CTT could not able to resolve the string of new Item ID, afterwards while processing array of new Item ids, it sends some error code which is not known to the server.
Before I was using same string processing function as used in other functions (eg. In GetItemID), but after implementing new logic this problem solved, though I don�t know what was the error before.

Remove Group:
I forgot to mention in my First post, Problem with Remove Group
In OPCServerObject->IOPCServer->RemoveGroup

Use Case1: When running all tests together
For test case 1 to 8 (All test cases) getting error � Duplicate Group Name Not Allowed
And with No Group Added Test Case fails
Use Case2: When running only Remove Group Test Cases
All test cases except 2, 6 and 8 passed. Test cases 2, 6 and 8 is expecting hr = OPC_S_INUSE which I am returning
Use Case3: Running tests 2, 6 and 8 individually
I can clearly see in the Debugger that OPC_S_INUSE returned but why OPC CTT Failed with Error stating �Expecting to Return OPC_S_INUSE�?
As in above Use Case 1 and Use Case 2 I am thinking that problem is somewhere there is still Reference to Group but What about Use Case 3 when only particular test ran?

What is the meaning of following Statement in OPCServerObject->IOPCServer->RemoveGroup->Case2 from Sever side?
�After checking for OPC_S_INUSE all references are released and the group will be removed automatically by the server.�

Does it mean
A. For bForce= FALSE -> Return OPC_S_INUSE and also Remove the Group (i.e. Automatically Group removed by the Server?)
B. For bForce=FALSE -> Only Return OPC_S_INUSE but don�t remove the Group
(Use Case 2 is only possible if I keep meaning of A above)

Thank you.

Maximun Items per subscription

Hareesh — Fri, 05 Mar 2010 12:08:59 GMT

Hi,
What is the maximum number of data items which can be added to a single subscription.

What is the maximum number of data changes conveyed per subscriptiion notification.

Is there any limits specified in the UA Specifications?

If there is such limits, please tell where?

Which is the most stable and version of opc.ua.core, server and client dlls?

What are the features missing in it?

Currently, we can see a number of versions marked as obsolate/testing/Beta etc. Also seeing some memory leaks, when number of subscription items are large(In version 1.1.307.0).

Regards,
hareesh