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What is OPCENUM Service? |
If you have already configured DCOM, OPCENUM Service (OPC Enumeration Service) enables clients of another node to access OPC Server of executive node in LAN.
OPCENUM Service requires DCOM. Refer to Here about DCOM configuration.
Notice
The following contents is intended for users who integrate with TAKEBISHI OPC Server to use smoothly.
TAKEBISHI doesn't guarantee the operational results about its setting way and each explanation in this site.
We recommend you to verify the function carefully.
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What is OPCENUM.EXE? |
Registry information will be required to access OPC Server on the other node from client machine.
This interface information of COM (property, method) is registered in registry of local disk because OPC Server is COM application.
OPCENUM.EXE is a program that is executed on the node OPC Server is installed in and provides registry information of OPC Server corresponding the request of the other node.
OPCENUM.EXE is developed by OPC Foundation and distributed by OPC Server vender.
Upper drawing shows OPCENUM function.
1.Call OPC BROWS object with the node name from OPC Client (Node B).
2.OPCENUM.EXE gets server list from local registry and passes it to Node B.
3.OPC Client accesses OPC Server object with the server info and node name.
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Run OPCENUM.EXE |
OPCENUM.EXE will be installed in system folder of Windows and registered in registry when OPC Server is installed.
OPCENUM.EXE executes automatically corresponding with the request of Client because it is COM application.
If you want to execute intentionally, execute OPCENUM.EXE directly as upper dialogue box shows.
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Run OPCENUM.EXE as a service program |
If you type "opcenum /service" as upper dialogue box shows, it enables you to use OPC Server as a service program even before logon for access from external in DCOM circumstances.
# Logon with user account that have Administrator authority to register it as a service program. After registration OPCENUM.EXE will be set "manual" so change it into "automatically" depending on your need.
# To cancel the service, type "OPCENUM /unregserver" and to re-register the service, type "OPCENUM /regserver".
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Instance of OPCENUM.EXE |
Running instance of OPCENUM.EXE could be checked in task manager as upper dialogue box shows. When it is used as application as usual, instance exists as long as it is browsed from client. When it is used as service, it always works.
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Access from Client |
Input machine name in "Server Node" and click "Refresh List".
It enables you to get registry information (COM information of OPC Server) from specified node through OPCENUM service.
Connecting OPC Server with DCOM will be available if node name and server name are specified.
# The upper window shows an example of OPC Client attached our OPC Server.
# The way of specifying node from client is different for each application. Refer to the explanation of your product.
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Sample
OPCENUM Service
Manual/Demo
