Description

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

Overview
Overview

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.

%RtLoop

N010 X0 Y0 Z0

;-loop : as long as

; V.RTG.LOOP.ENABLED = TRUE

N020 #RT WHILE

N040 X100

N050 Y100

N060 X0

N070 Y0

N090 #RT ENDWHILE

;------------

N100 X-20 Y-20 Z30

N110 M30

Notice

notice

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

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

Succession of real-time loops
Succession of real-time loops

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.

Notice

notice

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.

Notice

notice

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.

Direct backward motion immediately after loop entry
Direct backward motion immediately after loop entry

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.

Existing the loop backwards
Existing the loop backwards

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-.

Delete distance to go for a single block
Delete distance to go for a single block

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]