Description

Real-time loops allow you to influence the number of loop passes in the NC program during machining.

A real-time signal can be used to determine whether to remain in a loop or to exit it at the end of a loop pass.

If the real-time variable is not set, the loop is skipped.

It is also possible to program several real-time loops in succession.

Definition and behaviour of real-time loops

When programming a real-time loop in the NC program, make absolutely sure that the position in the plane when entering the loop is identical to the position at the end of the loop.

The start point and end point of the contour within a real-time loop must be identical. In case of deviations, error ID 50991 is output.

Within the loop you can use the "Backward motion on the path" or "Delete distance to go” functions.

Real-time loops are not permitted with tool radius compensation is active. Error ID 22158 is output.

Behaviours with backward motion on the path

With motion backward on the path combined with real-time loops, it is possible to move backward immediately after entering the loop.

It is also possible to enter a loop backwards in an NC program and to complete the loop in the backward direction. The loop can also be exited backwards by setting the real-time variable.

Behaviour for deleting distance to go

The “Delete distance to go” control unit can delete the distance to go for a single block in the real-time loop-.

The function can also be used in the backward direction. The restrictions regarding backward motion in combination with delete distance to go apply.
[FCT-C28// Combination with backward motion]