Siemens SIMATIC S5 Manual page 164

Ref. point coordinate
SW limit switch start (XA):
This value specifies the coordinate of the software start limit switch.
The value of the software start limit switch must be less than the value of the ref-
erence point coordinate and less than the value of the software end limit switch.
All these coordinates must be within the hardware limit switches.
Traversing range start (X4:
(For a rotary axis), This value indicates the start of the traversing range.
SW limit switch end (XE):
This value indicates the coordinate of the software end limit switch. It must be greater than
the software start limit switch, and greater than the reference point coordinate and must
be within the hardware limit switches.
Traversing range end (XE):
(For rotary axis), This value indicates the end of the traversing range of the rotary axis.
This is physically the same point as the start point. The actual position display jumps auto-
matically from the end value to the start value.
Polarity of limit switch:
Here, you can decide whether the hardware limit switches are detected as having been ac-
tivated on a positive or negative edge.
Digital
To the
power input IP247
circuitry
\
\
Machine
start
Fig. 5/1 O Position of limit switches
PC BCD-coded:
If vou enter "ves" in this field (HELP key <F7>), all coordinates (targets, travel incre-
by the IP247 in BCD format. The range of values in BCD format is limited to +/- 9999999
Hardware
limit switch
start
s Traversing range
s
x
s
braking distance
brake
Digital in-
put IP247
Hardware
limit switch
end
!
x
E
Input
To power
x
Machine
end
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