NT Resources and the Realtime-Settings

One of the NT Task Manager's functions is to provide the user with a list of the running processes and of the amount of CPU time that they are using. A different interpretation must be given to the display when TwinCAT is running:

The TwinCAT real-time extension makes computing time available to the NT operating system. The NT operating system evaluates this portion as 100% CPU time. The display of the CPU time associated with processes in the NT task manager is thus not related to the CPU time itself, but to the remaining time still available to NT.

Example:

If TwinCAT requires a constant 35% of the CPU's capacity (see the "Realtime Settings"),

and an additional process is displayed in the NT Task Manager with 97% "CPU time",

it means that this process is using 63,05% of the real CPU time.