OPC Alarm and Event Server Technical Notes

  • Redundant environments.
  • DCOM configuration.
  • OPC Alarm & Event server shortcut icon.

Redundant Environments

The OPC Alarm and Event Server should be run on a third computer in a redundant environment. The OPC server will then fail over correctly

Note: If you try to configure an OPC Alarm and Event Server on the primary and secondary computers, you will create a feedback loop that will fail.

DCOM Configuration

When you want the OPC Alarm and Event Clients to communicate with an off-node OPC Alarm and Event Server, configure the same DCOM configuration for the OPC Alarm and Event Server and OPCEnum as you do for the CIMPLICITY OPC Server.

OPC Alarm & Event Server Shortcut Icon

You can place a shortcut ic...to open the OPC Alarm & Event server.

When the OPC Alarm & Event server opens it:

  • Reads project configuration at startup and populates the server configuration database.
  • Sets its status to OPCAE_STATUS_NOCONFIG until all configuration information is processed.
  • Sets the status to OPCAE_STATUS_RUNNING when it is ready.
  • Updates its configuration as projects are added and removed and in addition processes dynamic configuration notifications from the projects to keep its own configuration database up-to-date.
Important: A&E OPC Clients should not use the A&E OPC Server while the status is OPCAE_STATUS_NOCONFIG.

Make sure the server status is OPCAE_STATUS_RUNNING before attempting to set a filter.