Read "Position And Track Data - Siemens S7-300 Operating Instructions Manual

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10.12 Read "position and track data"

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
38.4
128.0
132.0
136.0
130
Name Type
ACTPOS_EN BOOL
ACTPOS DINT
ACTSPD DINT
TRACK_ID DWORD
Start value
FALSE 1 = read position and track data
L#0 Current position
L#0 Current velocity
DW#16#0 Track identifier bits of tracks 0 to 31
Operating Instructions, 05/2011, A5E01071724-03
Comment
FM 352 electronic cam controller