Opc diagnostic events – IDEC WindSRV User Manual
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Since diagnostic information affects memory/file storage, users can decide the maximum number of OPC diagnostic
events that should be captured at any specific time by modifying the Maximum number of diagnostics to capture.
This value only pertains to the number of events and does not include the number of details, as the detail count for a
particular event could be potentially very high. The range for this setting is 1000 to 30000. The default value is 5000.
OPC Diagnostic Events
Click on a link below to jump to any of the following OPC Diagnostic Events.
IConnectionPointContainer(Server)
IConnectionPointContainer (Group)
IClassFactory
The IClassFactory interface contains several methods intended to deal with an entire class of objects. It is implemented
on the class object for a specific class of objects and is identified by a CLSID.
QueryInterface - The client can ask the object whether it supports any outgoing interfaces by calling
QueryInterface for IConnectionPointContainer. If the object answers "yes" by handing back a valid pointer, the
client knows it can attempt to establish a connection.
AddRef - Increments the reference count for an interface on an object. It should be called for every new copy of
a pointer to an interface on a given object.
Release - Decreases the reference count of the interface by 1.
CreateInstance - Creates an uninitialized object.
LockServer - Allows instances to be created quickly when called by the client of a class object to keep a server
open in memory.
Server
The client calls CoCreateInstance to create the Server object and the initial interface.
QueryInterface - The client can ask the object whether it supports any outgoing interfaces by calling
QueryInterface for IConnectionPointContainer. If the object answers "yes" by handing back a valid pointer, the
client knows it can attempt to establish a connection.
AddRef - Increments the reference count for an interface on an object. It should be called for every new copy of
a pointer to an interface on a given object.
Release - Decreases the reference count of the interface by 1.
IOPCCommon
This interface is used by all OPC Server types (DataAccess, Alarm&Event, Historical Data and etc.). It provides the