Settings
10.12 Read "position and track data"
FM 352 electronic cam controller
130 Operating Instructions, 05/2011, A5E01071724-03
10.12 Read "position and track data"
Definition
The "position and track data" function can be used to read the actual position value, the
velocity, and the track identifier bits. The track identifier bits are recorded before being
logically linked to machine and channel data.
The algorithm implemented in the FM 352 calculates velocity changes greater than 1
pulse/4 ms. The indicated velocity includes this inaccuracy, and is thus unsuitable in
particular for closed-loop control. The internal velocity value used for dynamic cam control
offers a higher precision.
Programming steps
1. Set the trigger bit at the channel DB.
2. The data are stored in the channel DB.
Data used in the channel DB
Address Name Type Start value Comment
38.4 ACTPOS_EN BOOL FALSE 1 = read position and track data
128.0 ACTPOS DINT L#0 Current position
132.0 ACTSPD DINT L#0 Current velocity
136.0 TRACK_ID DWORD DW#16#0 Track identifier bits of tracks 0 to 31
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