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Empty OPC items tree when browsing the Merz OPC SAIA server
05 Dec 2022 14:17 #11294
by micham
Replied by micham on topic Empty OPC items tree when browsing the Merz OPC SAIA server
Hi,
Thank you for your answer.
I tried the EasyOpcClient on the customer's computer and I was able to browse for OPC items. After a while I got the error below but then I closed the client and open it again and I could browse OPC items again.
In our product the implementation is as you can see below. Please let me know if you see anything in the code or implementation that is incorrect.
Thank you.
Michael
Our code:
DaItemDialog1.ServerDescriptor.MachineName = server_properties.server_comp_name
DaItemDialog1.ServerDescriptor.ServerClass = server_properties.RealServerName
DaItemDialog1.MultiSelect = True
If DaItemDialog1.ShowDialog() = DialogResult.OK Then
SetChangeFlagToTrue(True) ' Jul-21-2021 V1.081
values = DaItemDialog1.NodeDescriptors
Cursor.Current = Cursors.WaitCursor
For i = 0 To (values.Count - 1)
Dim varType As VarType
szArrayLen = ""
szType = ""
ItemRemoved = False ' Aug-18-2021
Try
varType = easyDAClient.GetDataTypePropertyValue(server_properties.server_comp_name, server_properties.RealServerName, values(i).ItemId)
Catch opcException As OpcException
MsgBox("Error getting OPC-DA Item Data-Type(" + values(i).ItemId + ")!" + vbCrLf +
"MachineName=" + server_properties.server_comp_name + vbCrLf +
"ServerClass=" + server_properties.RealServerName + vbCrLf +
"CLSID=" + server_properties.server_CLSID + vbCrLf +
"OPC Server exception: " + vbCrLf + opcException.Message + vbCrLf + opcException.InnerException.Message, vbOKOnly + vbExclamation, "Error")
Exit For
End Try
Error message:
Type: OpcLabs.BaseLib.Browsing.BrowseException
Data:
HelpLink:
HResult: -2146233088 (0x80131500)
InnerException:
OpcLabs.BaseLib.Runtime.InteropServices.ExtendedCOMException (0x800706BA): The RPC server is unavailable.
+ This error can mean that specified machine name of the OPC server is incorrect, the machine is not reachable, or does not have DCOM not enabled.
+ The host name used is empty.
+ The machine name was ''.
+ The client method called (or event/callback invoked) was 'BrowseNodes'.
Data:
OpcLabs.EasyOpc.Implementation.ErrorEnhancement.Processed: True
OpcLabs.EasyOpc.Implementation.DAErrorEnhancement.Processed: True
ErrorCode: -2147023174
HelpLink:
HResult: -2147023174 (0x800706ba)
InnerException:
Message:
The RPC server is unavailable.
+ This error can mean that specified machine name of the OPC server is incorrect, the machine is not reachable, or does not have DCOM not enabled.
+ The host name used is empty.
+ The machine name was ''.
+ The client method called (or event/callback invoked) was 'BrowseNodes'.
Source:
StackTrace:
TargetSite:
XML Qualified Name 2: opcfoundation.org/DataAccess/:E_FAIL.0x800706BA
IsEmpty: False
Name: E_FAIL.0x800706BA
Namespace: opcfoundation.org/DataAccess/
Message: Problem browsing OPC Data Access (OPC-DA) leaves.
Source:
StackTrace:
TargetSite:
Thank you for your answer.
I tried the EasyOpcClient on the customer's computer and I was able to browse for OPC items. After a while I got the error below but then I closed the client and open it again and I could browse OPC items again.
In our product the implementation is as you can see below. Please let me know if you see anything in the code or implementation that is incorrect.
Thank you.
Michael
Our code:
DaItemDialog1.ServerDescriptor.MachineName = server_properties.server_comp_name
DaItemDialog1.ServerDescriptor.ServerClass = server_properties.RealServerName
DaItemDialog1.MultiSelect = True
If DaItemDialog1.ShowDialog() = DialogResult.OK Then
SetChangeFlagToTrue(True) ' Jul-21-2021 V1.081
values = DaItemDialog1.NodeDescriptors
Cursor.Current = Cursors.WaitCursor
For i = 0 To (values.Count - 1)
Dim varType As VarType
szArrayLen = ""
szType = ""
ItemRemoved = False ' Aug-18-2021
Try
varType = easyDAClient.GetDataTypePropertyValue(server_properties.server_comp_name, server_properties.RealServerName, values(i).ItemId)
Catch opcException As OpcException
MsgBox("Error getting OPC-DA Item Data-Type(" + values(i).ItemId + ")!" + vbCrLf +
"MachineName=" + server_properties.server_comp_name + vbCrLf +
"ServerClass=" + server_properties.RealServerName + vbCrLf +
"CLSID=" + server_properties.server_CLSID + vbCrLf +
"OPC Server exception: " + vbCrLf + opcException.Message + vbCrLf + opcException.InnerException.Message, vbOKOnly + vbExclamation, "Error")
Exit For
End Try
Error message:
Type: OpcLabs.BaseLib.Browsing.BrowseException
Data:
HelpLink:
HResult: -2146233088 (0x80131500)
InnerException:
OpcLabs.BaseLib.Runtime.InteropServices.ExtendedCOMException (0x800706BA): The RPC server is unavailable.
+ This error can mean that specified machine name of the OPC server is incorrect, the machine is not reachable, or does not have DCOM not enabled.
+ The host name used is empty.
+ The machine name was ''.
+ The client method called (or event/callback invoked) was 'BrowseNodes'.
Data:
OpcLabs.EasyOpc.Implementation.ErrorEnhancement.Processed: True
OpcLabs.EasyOpc.Implementation.DAErrorEnhancement.Processed: True
ErrorCode: -2147023174
HelpLink:
HResult: -2147023174 (0x800706ba)
InnerException:
Message:
The RPC server is unavailable.
+ This error can mean that specified machine name of the OPC server is incorrect, the machine is not reachable, or does not have DCOM not enabled.
+ The host name used is empty.
+ The machine name was ''.
+ The client method called (or event/callback invoked) was 'BrowseNodes'.
Source:
StackTrace:
TargetSite:
XML Qualified Name 2: opcfoundation.org/DataAccess/:E_FAIL.0x800706BA
IsEmpty: False
Name: E_FAIL.0x800706BA
Namespace: opcfoundation.org/DataAccess/
Message: Problem browsing OPC Data Access (OPC-DA) leaves.
Source:
StackTrace:
TargetSite:
Attachments:
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05 Dec 2022 12:04 #11292
by support
Replied by support on topic Empty OPC items tree when browsing the Merz OPC SAIA server
Hello.
I get "Loading of configuration failed" when I try to open the file (SAIA_MERZ_OPCServerConffile\OPC_config.sbcfg) you attacched in the zip.
I tried my own new configuration instead (added one station to the blank config). With that:
- Browsing with Native client appeared to work fine (that is, I could see the node at the root for my station, and some sub-nodes underneath - I supposed that's how it should look like).
- Browsing with NetApi client did not work, and gave an error "OPC server has returned status: 'Test'. Problem details (status info): -
+ The client method called (or event/callback invoked) was 'BrowseNodes'.".
I suppose that the error given by NetApi client has to do with the fact that I am not using any real hardware. There is an IOPCServer::GetStatus which the NetApi client checks for, and when the returns this particular status, it reports it as an error. I admit this check should be more relaxed, the OPC_STATUS_TEST is not really a falire status.
So this is something that could be changed. However, it appears that your observations are not the same as mine, at least partially, so we need to align that first.
Questions:
1. You wrote that "we get an empty tree". Did you get any error indication, with the Native or NetApi client, too?
2. It seems weird to me that many times I instruct you to reconfigure the EnableNativeClient/EnableNetApiClient, you report that is had no effect. Can you elaborate on how precisely are you setting it? Are you doing it only inside your own application? If so, can you test the same from our tools such as OpcCmd, or Connectivity Explorer? (I can give instructions for that).
Thank you
I get "Loading of configuration failed" when I try to open the file (SAIA_MERZ_OPCServerConffile\OPC_config.sbcfg) you attacched in the zip.
I tried my own new configuration instead (added one station to the blank config). With that:
- Browsing with Native client appeared to work fine (that is, I could see the node at the root for my station, and some sub-nodes underneath - I supposed that's how it should look like).
- Browsing with NetApi client did not work, and gave an error "OPC server has returned status: 'Test'. Problem details (status info): -
+ The client method called (or event/callback invoked) was 'BrowseNodes'.".
I suppose that the error given by NetApi client has to do with the fact that I am not using any real hardware. There is an IOPCServer::GetStatus which the NetApi client checks for, and when the returns this particular status, it reports it as an error. I admit this check should be more relaxed, the OPC_STATUS_TEST is not really a falire status.
So this is something that could be changed. However, it appears that your observations are not the same as mine, at least partially, so we need to align that first.
Questions:
1. You wrote that "we get an empty tree". Did you get any error indication, with the Native or NetApi client, too?
2. It seems weird to me that many times I instruct you to reconfigure the EnableNativeClient/EnableNetApiClient, you report that is had no effect. Can you elaborate on how precisely are you setting it? Are you doing it only inside your own application? If so, can you test the same from our tools such as OpcCmd, or Connectivity Explorer? (I can give instructions for that).
Thank you
Attachments:
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