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01.93
9 Axis/PLC Interface (DB 32)
9.3 Signals to axis
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*DECELERATION REFERENCE POINT APPROACH
DW K+1, bit 12
REFERENCE POINT APPROACH mode only
1/0 transition:
Effects deceleration of the selected axis to the reference point cutoff speed
(NC MD 284*).
0/1 transition:
Effects traverse to the zero mark of the measuring (2000 units
travel ± reference point offset).
a) Reference point approach without automatic direction recognition
Signal chart
6
3
R
Z
1
2
4
5
7
1:
Reference point approach speed
2:
Cutoff speed
3:
Starting point for reference point approach
4:
Measuring system zero mark signal
5:
*DECELERATION REFERENCE POINT APPROACH signal
6:
Actuating cam
7:
Limit switch
Sequence:
The Z axis must be located at the starting point, e.g. in the negative direction from the referen-
ce point. The operator presses the Z + key and the axis approaches the reference point. As
soon as the actuating cam passes the limit switch, the *DECELERATION REFERENCE POINT
APPROACH signal changes from 1 to 0; the axis decelerates to the cutoff speed. When the
actuating cam has cleared the limit switch, the *DECELERATION REFERENCE POINT
APPROACH signal changes from 0 to 1 and initiates the approach to the next zero mark of the
measuring system. As soon as the zero mark signal is given, the axis homes in to the
reference point.
Peripheral condition:
The limit switch that issues the *DECELERATION REFERENCE POINT APPROACH signal
should be a normally closed switch. If the connection to the limit switch is interrupted, this can
be recognized and actuation of the axis movement prevented.
_______
*
Signal is 0 actve
©
Siemens AG 1991 All Rights Reserved 6ZB5 410-0HE02
9
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SINUMERIK 880 (PJ)