Siemens SIMATIC S5 Manual page 112

Application Examples
The velocity on this section is to be 100 mm (3.9 in.)/s which correponds to the
following stepping rate f
A
The base value is set at 20 Hz from which the following velocity factor V is
calculated:
The direction of travel "Forwards" is entered in the positioning job as the
operating mode. The positioning message for this job is represented in Table 6-5.
Table 6-5. Positioning Job for the Path A to B
Byte Address
0 QB 88
Reference point approach
1 QB 89
Operating mode OM 0
2 QB 90
3 QB 91
6-36
:
100 mm/s
f =
A
0.020 mm/pulse
5 kHz = BV V
*
5 kHz = 20 V
*
V = 250 = FA
General meaning
Multiplier for the
velocity (V),
V can assume values
from 1 to 255
Reduction factor R = 1
(RPA)
OM 1
,
Path P16 to P19
Path
P8 to P15
Path
P0 to P7
= 5 kHz
R
*
1
*
H
Positioning data for path
A to B
V = 250
QB 88 = 1111 1010
QB 88 = FA
H
R = 0, RF= 0
OM 1=0, OM 0=1
QB 89 = 0001 0000
QB 89 = 10
H
QB 90 = 0010 0111
QB 90 = 27
H
QB 91 = 0001 0000
QB 91 = 10
H
EWA 4NEB 812 6061-02a
IP 267