Siemens SIMATIC FM 351 - Target Approach of Positioning

2
2-6
FM 351 Positioning Function Module
EWA 4NEB 720 6001-02
The figure clearly illustrates the sequence.
Target
–1000 mm 1000 mm
0
Switchover difference, positive
Switch-off difference, positive
1
2 3
4
Target rangeStandstill range
v
stand
v
creep
5
6
t
m
1
2
3 4
Target range with v
stand
reached: POS_RCD is set
Standstill velocity reached
5
6
t
m
= Monitoring period
Figure 2-4 Target Approach of Positioning
Schematic: Target
Approach
Principles of Positioning