Nematron Pointe Controller - Manual (Page 204)

Chapter 7: Monitoring and Debugging Pointe Controller User Guide
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7.2 Checking System Performance
You can check the system performance of an attached Pointe Controller unit by
opening the Performance Metrics window:
From the View menu, choose System Performance. The Performance
Metrics window will appear.
The Performance Metrics window offers three tabs: Scanning, Loading, and
Errors.
7.2.1 Scanning
The Scanning tab shows how much real time (in microseconds) it is taking the
controller to process the Flow Charts and Ladder Diagrams that make up the
currently running project, as well as to scan the I/O modules, operator panel, and
OptiLogic RTUs that are connected to the controller.
For charts/ladders, the scan time is the time elapsed from when the input tags are
read in, through the entire logic solve, to when the output tags are written out.
For modules, panels and RTUs, the scan time is the time elapsed from when the
controller’s processor becomes available to scan the component to when that
component’s scan is complete.
Overruns occur when a component does not complete its current scan before its
next scheduled scan. For example, if a module is configured with a Scan Interval
of 10, then it is scheduled to be scanned at 0, 10, 20, 30, and so on. The scan
starting at 0 must be completed before 10. If it is not, it is registered as an
overrun.
NOTE: All charts and I/O scan concurrently, not sequentially.