Can you capture a detailed log of OPC client and server communication events, including when connections go up and down?
Capturing OPC Client and Server Communication Traffic Logs
OPC Expert maintains a detailed log of communication events through its Communication Event Window and broader monitoring capabilities. Every connection state change, error condition, and reconnection attempt is recorded with timestamps and diagnostic information. This log is visible in real time within the interface and is retained for review after the fact, giving engineers a clear record of exactly when connections changed state and what caused each transition.
The Communication Event Window
The Communication Event Window is a dedicated pane within OPC Expert that displays a running record of all OPC server connection activity. When a connection is established successfully, when it drops, when a reconnection is attempted, and when it succeeds again, each event is logged with a description and timestamp. The descriptions use the same verbose, plain-language format as OPC Expert’s live diagnostic messages, so entries in the log are immediately interpretable without cross-referencing error code documentation.
Persistent Monitoring Over Time
For intermittent issues that do not reproduce reliably, OPC Expert’s monitoring module can run continuously over hours or days, capturing every connection event during that period. This is particularly valuable when investigating problems that occur overnight, during shift changes, or at specific production cycle points. The persistent log provides the temporal evidence needed to correlate connection drops with external events such as network maintenance, PLC cycles, or environmental conditions.
Using the OPC Snapshot for Documentation
When a connection failure occurs and you need to document the state of the system for support or root cause analysis, the Snapshot feature captures all relevant configuration and OPC settings in a single exportable report. This captures a point-in-time view of the system state alongside the communication log, giving support teams or management a complete picture without requiring manual documentation.
Relevant Tools
OPC Expert (Monitor OPC Data): Provides continuous monitoring with event logging, connection state tracking, and alert capabilities, making it the primary tool for capturing a persistent record of OPC communication activity.
OPC Expert (Troubleshooting OPC and DCOM): Adds diagnostic context to each logged event, identifying fault categories and suggested corrective actions alongside the raw connection history.
A detailed communication log is one of the most practical tools for distinguishing between persistent configuration problems and transient network events, and OPC Expert’s event logging gives engineers the timeline evidence needed to make that determination.