OPC Diagnostics facilitate troubleshooting OPC client issues

Find out what your OPC client actually requested and what TOP Server actually replied

The OPC Diagnostics Window provides a real-time and historical view of OPC events that occur between any OPC client and the TOP Server. An OPC event is a method call that a client makes to the TOP Server, or a callback the TOP Server makes to a client.

The OPC Diagnostics Window is separate from the main TOP Server configuration window, which allows you to hide the window even while diagnostics are being captured. In the event that there is an issue between a client and the TOP Server, the Diagnostics Window can be opened to display the events that have occurred. The operation of the OPC Diagnostics Window can be controlled through its’ menu, toolbar or by right-clicking in the Event Window.

Diagnose issues with OPC client connections over time with file persistence

The TOP Server also allows OPC Diagnostics to be persisted to file. Capturing diagnostics must be enabled for each specific OPC interface in the TOP Server Project Properties.

The persistence settings for TOP Server OPC Diagnostics are configurable and located under the TOP Server Administration settings, under the Event Log tab, as shown to the left.

• Persistence Mode:
  • Memory (no persistence) - The default option follows the legacy behavior of OPC Diagnostics and diagnostics are not persisted to file in this mode.
  • Single File - All diagnostics records will be persisted to one file only.
  • Extended Data Store - Enables spanning of diagnostics records across multiple files based on the other settings.
• Max Records - Maximum number of records that the log can contain before the oldest records start being overwritten (Only available for Memory or Single File modes).
• Log File Path - File system directory where log files will be stored.
• Max single file size (KB) - Maximum size in KB that any one log file can contain. (Only available for Extended Data Store Mode).
• Min days to preserve - Once log files are older than this number, they will be deleted. (Only available for Extended Data Store Mode).