Siemens SIMATIC FM 452, Manual

Page: 18 / 210

Basics of Cam Control
2-4
FM 452 Electronic Cam Controller
C79000-G7076-C452-04
2.2 Tracks
2.2.1 Tracks and Track Result
Tracks
With the 32 tracks, you can control a maximum of 32 different switching actions.
You can evaluate the tracks with the return signals.
Each of the first 16 tracks (track 0 to 15) has a digital output (Q0 to Q15) of the
FM 452 assigned to it that can, for example, control a connected contactor directly.
Track Result
You have a maximum of 128 cams available that can be assigned to any track.
Several cams can be assigned to each track. The track result is obtained by the
logical ORing of all cam values of this track (see Figure 2-4, page 2-11).
Example of a Track Result
During parameter assignment, you specify the following cams for track 3:
Cam Cam start Cam end
1 101 m 106 m
2 100 m 104 m
This results in the following track result:
Cam 1
Cam 2
Track 3
105 m 100 m 110 m
s
Track result
Figure 2-1 Calculating the Track Result
Track Enable
To allow the track results of tracks 0 to 15 to be applied as track signals to the
digital outputs Q0 to Q15 of the FM 452, the cam tracks you are using must be
enabled.