Siemens SINUMERIK 880 SW 6 Planning Manual page 253

05.91
SAC ON/OFF
0/1 transition: The "semi-automatic centering" (SAC) function is switched over, i.e. switched
on or off, each time the signal changes from 0 to 1. The current switching
status is indicated by the SAC ACTIVE signal.
1/0 transition: The PLC user program must reset the SAC ON/OFF signal if the status of
SAC ACTIVE has changed.
Preconditions:
• The SAC function requires a free NC channel. This channel is automatically determined by
the NC.
• The setpoint overlay for the following axis must be switched on
(FA OVERLAY ACTIVE =1).
• The gearbox link must be switched on (LINK ACTIVE =1).
Notes:
• The velocity of the axis movement can be influenced by means of the feedrate override.
• After switching on the SAC function the axis must be traversed by at least one path
increment before 1ST FLANK APPROACHED is set.
FA 1: m=0
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Siemens AG 1991 All Rights Reserved
SINUMERIK 880 (PJ)
FA 2: m=4
6ZB5 410-0HE02
7 ELG-Specific Signals (DB 29)
7.3 Signals to ELG (DB 29)
DW m + 3, bit 8
FA 3: m=8
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