Retrace Support (Te7); Signals To Channel; Signals From Channel - Siemens SINUMERIK 840D sl Function Manual

Z3: NC/PLC interface signals

21.11 Retrace Support (TE7)

21.11 Retrace Support (TE7)
21.11.1

Signals to channel

DB21, ...
DBX0.1 Reverse/Forward
Edge evaluation: Yes
Signal state 1 or edge Activate reverse travel.
change 0 → 1
The RESU main program CC_RESU.MPF is generated from the traversing blocks recorded in the
RESU-internal block buffer in order to initiate travel back along the contour on the next NC START.
Edge change 1 → 0 Activate forward travel.
The RESU main program CC_RESU.MPF is generated from the traversing blocks recorded in the
RESU-internal block buffer in order to initiate travel forwards along the contour on the next NC
START.
Signal state 0 Not relevant.
Signal irrelevant for ... RESU technological function not loaded or not activated.
DB21, ...
DBX0.2 Start retrace support
Edge evaluation: No
Signal state 1 Start retrace support:
The original machining program is reselected and a block search is carried out to locate the
program continuation point.
Signal state 0 Not relevant.
Signal irrelevant for ... The NC is not in Retrace mode or RESU is not active.
21.11.2

Signals from channel

DB21, ...
DBX32.1 Retrace mode active
Edge evaluation: No
Signal state 1 The "Retrace mode active" signal is active as long as the control is in Retrace mode. This is the
case from initial activation of the "reverse/forward" signal until activation of the "start retrace
support" signal.
Signal state 0 The machining program is executed.
Signal irrelevant for ... RESU technological function not active.
750
Signal(s) updated:
Signal(s) updated:
Signal(s) updated:
Function Manual, 09/2011, 6FC5397-2BP40-2BA0
Special Functions