Flow Status

The Status Chart

The Status Chart provides detailed information about individual data transfers.

• Green transfer points represent individual transfers that were executed successfully. The transferred values are stored in the status database. The retention period for the stored values is defined in the settings.
  If you click on a transfer point for which the retention period has expired, the message “Transfer values cannot be displayed because the retention period for the values has expired” appears.
  Red transfer points indicate faulty transfers and are retained longer in the Long Storage database.
• Purple transfer points indicate transfers that are processed via Store and Forward. A purple dot appears as soon as the transfer is complete and the data is cached—regardless of whether it has already been forwarded at that point. Whether the cached data has already been forwarded or is still pending is indicated by its own root node Store and Forward in the status tree—note that “Store and Forward” is a separate node.
• Yellow transfer points indicate transfers that were classified as warnings—for example, in the case of query transfer objects, when the transfer was aborted due to an empty query result. You can specify whether such a case is treated as a warning (yellow) or an error (red) in the query section of the respective transfer object (for example, DB Select – Query).
• When you click on a transfer point, it is highlighted in light blue and the transferred data is displayed in the flow.
• If you hover your mouse over a transfer point, the execution time will be displayed.
• If you hover over the Gantt chart below the status chart, you can see the current flow status. The current escalation level is also displayed here.
• Above the status chart, you’ll find the “Previous transfer” and “Next transfer” buttons, which let you view the transfer next to the currently selected one.
  Use the “Switch to Live View” button to monitor the progress of individual transfers.
• You can adjust the zoom level using the mouse wheel.
• If strings or arrays are too long, the transferred value will be truncated in the display—but it will, of course, be transferred in full. The display length can be adjusted in the Status Options under “Diagnostic Data Logging.” The default value is 1,000 characters.

• Errors are indicated by a red marker in the status chart. If you hover your mouse over the flow’s transfer object with the error, detailed information about the error will be displayed:

• The status Gantt chart changes color if an error occurs in the plug-in, a warning appears, or the flow is aborted.
  The status Gantt chart is displayed in orange (Checking the flow) when the flow is being checked, and in red when the flow is in the Error state (error in the plug-in). If the flow is operating correctly, the status Gantt chart appears in green (Ready).

The two levels are independent of each other: If the remote station fails, the individual transfers fail and the status chart turns red for the duration of the disruption—the Status Gantt below it remains green as long as the flow itself is ready.

When the OPC Router is shut down, all flows are assigned the “Shutdown” status. In the history, this status appears in red—whereas in the status tree, it appears in gray. For information on which color in the tree corresponds to which status, see Colors in the Status Tree.

In the status tree, you can manually start a flow’s transfer by right-clicking. A trigger does not need to be present in the flow for this. Manually started transfers are displayed in blue on the chart. Additionally, the system records who started the transfer.

If you click the “eye” icon next to a transfer, the complete array or stream is displayed.

Live Execution Status

In addition to the readiness state (e.g., “Ready”) and the result of the last transfer, the status tree also shows live whether a flow is currently running—without having to wait for the result:

• In Progress – the flow is currently executing a transfer. The flow node displays an animated icon.
• In Queue – a trigger for the flow has been activated, but the transfer is still waiting for a free execution thread. The flow node is marked with a queue icon.

The display updates almost in real time (every second). Very short transfers are identified by a running execution counter, ensuring that even rapidly successive executions remain visible. The live status is not recorded in the status history—the result (success/error) appears there as usual.

Multiple Triggers (AND Link)

If a flow has multiple triggers linked with AND, the flow does not run until all triggers have been triggered. In the flow diagram of the status view, you can see for each trigger whether it has already been triggered and is waiting for the remaining triggers (“Trigger triggered – waiting for linked triggers”). This lets you see at a glance which triggers in an AND combination are still pending. With an OR combination, the first trigger to fire starts the flow immediately; there is no waiting.

An existing trigger error (flow cannot be started) is displayed unchanged on the trigger and takes precedence over the activity display.

Escalation Levels for Status Logging

If status logging has been disabled, a warning appears in the status display. If logging has been completely disabled at escalation level 4, the affected time period is shaded gray.

For a more detailed explanation of the escalation levels, please visit the Escalation Levels page.