Definition Of Terms; Functional Sequence (Principle) - Siemens SINUMERIK 840D sl Function Manual

TE7: Continue machining at the contour (retrace support) - 840D sl only
19.2 Function description
19.2.2

Definition of terms

Interruption point
The interruption point is the point of the contour at which the traversing movement comes to
a standstill following an NC stop and reverse travel is activated.
Program continuation point
The program continuation point is the point of the contour at which reverse travel terminates
and program continuation is activated.
Retraceable contour range
Retraceable contour ranges consist of traversing blocks in the configured RESU working plane
(e.g. 1st and 2nd geometry axis of the channel), that are programmed in the part program
between the RESU start command CC_PREPRE(1) and the RESU stop command
CC_PREPRE(0) (see "Figure 19-2 Retraceable contour range (Page 701)").
19.2.3

Functional sequence (principle)

The principle sequence of the RESU function between the interruption point, program
continuation point and continuation of part program processing is described below.
Requirements
A part program with traversing blocks in the configured RESU working plane (e.g. 1st and 2nd
geometry axis of the channel) as well as the part program command for the RESU start has
been started in the 1st channel.
Functional sequence
1. Interrupt part program processing:
The part program processing / traversing movement may be interrupted any number of
traversing blocks after RESU start by NC stop.
2. Select reverse travel:
The selection of the reverse travel is by PLC interface signal:
DB21, ... DBX0.1 = 1 (forward / reverse)
3. Reverse travel:
The contour is traversed in the RESU working plane in the reverse direction with NC start.
Instead of the current machining program, RESU selects the automatically generated
RESU main program.
For more about RESU programs, see Section "RESU-specific part programs (Page 712)".
4. End reverse travel:
Once the required program continuation point on the contour has been reached, reverse
travel is ended using NC stop.
702
Function Manual, 01/2015, 6FC5397-2BP40-5BA2
Special functions