The CNC
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Operating Manual XCx 300 / 500 / 540 Version 09/08
The right variables will be inserted in Global_Variables section
CNC_Common. The variables are marked as OPC.
10.2
Important Notes on the Multi-Tasking System and CNC
If the CNC is to operate safely it is important that you
know the task hierarchies and take them into
consideration in the individual user tasks.
For the CNC:
The total runtime of the user tasks with priority 0 to 2 must not
exceed half the runtime of the position controller task (priority 3).
The user task running synchronously with the IPO level (event 6)
must have a priority between 7 (IPO task) and 3 (position
controller task).
The CAN process is called by the system at the same time as the
IPO task if the CAN cycle time is the same as the IPO cycle or
position controller cycle.
The user task associated with event 5 runs after the CAN
process has been executed.
