How To Fix COOPC505 - OPC Alarms/Events subscription &1 already activated on the server

SAP Error Message - Details

• Message type: E = Error

• Message class: COOPC - Messages for SAP-OPC Integration

• Message number: 505

• Message text: OPC Alarms/Events subscription &1 already activated on the server

What causes this issue?

Each application can activate an
<DS:GLOS.73510C7AAAD9D511B1250008C784EFB1>OPC Alarms/Events
subscription</> only once on an
<DS:GLOS.81831343B0CAD411B11B0008C784EFB1>OPC server</>. However, this
application tried to activate the OPC Alarms/Events subscription &V1&
(in plant &V2&) a second time. This is not possible.

System Response

This message serves as a warning only. No inconsistency occurred. The
existing subscription that was activated on the OPC server remains
unchanged. The application can receive events.

How to fix this error?

If the message is displayed after you switched off the system
unexpectedly and started it again, there is a temporary inconsistency
that is fixed automatically. In this case, you can ignore the message.
If this message appears more often during normal processing, there may
be a program error. Contact your system administrator.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message COOPC505 - OPC Alarms/Events subscription &1 already activated on the server ?

  The SAP error message COOPC505 indicates that there is an attempt to activate an OPC (OLE for Process Control) Alarms/Events subscription that is already active on the server. This typically occurs in scenarios where multiple attempts are made to subscribe to the same OPC alarms/events without properly deactivating the previous subscription.
  Cause:
  
  Duplicate Subscription: The most common cause is that the same subscription is being activated multiple times without deactivating the previous instance.
  Session Management: If the application or user session is not properly managing subscriptions, it may lead to attempts to activate the same subscription again.
  Configuration Issues: There may be issues in the configuration of the OPC server or the SAP system that lead to improper handling of subscriptions.
  
  Solution:
  
  Deactivate Existing Subscription: Before activating a new subscription, ensure that any existing subscription is properly deactivated. This can usually be done through the OPC client interface or the relevant SAP transaction.
  Check Subscription Management Logic: Review the logic in your application or script that manages OPC subscriptions to ensure it checks for existing subscriptions before attempting to activate a new one.
  Restart the OPC Server: In some cases, restarting the OPC server may help clear any stale subscriptions that are causing conflicts.
  Review Logs: Check the logs for any additional error messages or warnings that may provide more context on why the subscription is being activated multiple times.
  Consult Documentation: Refer to the SAP documentation or the OPC server documentation for specific instructions on managing subscriptions.
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide patches or updates.
  OPC Specifications: Familiarize yourself with the OPC specifications and how subscriptions are managed within the context of your specific OPC server.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they have found.
  
  By following these steps, you should be able to resolve the COOPC505 error and manage your OPC subscriptions effectively.