Siemens sinumerik 840D sl Function Manual page 187

Detailed description
2.3 SINUMERIK 840Di with PROFIBUS DP
2.3.1 Description of a DP cycle
Actual values
At time T
the next DP cycle, the actual values are transferred to the DP master in the time T
Position controller
In time T
actual position values to calculate the new speed setpoints.
Setpoints
At the start of the next DP cycle, the speed setpoints are transferred from the DP master to
the DP slaves (drives) in the time T
At time T
Figure 2-2
10
, the actual position values are read from all the equidistant drives (DP slaves). In
I
where T > T the NC position controller is started and will use the transferred
M, M DX,
, the speed setpoints are taken as new specified values for all drive controllers.
O
Optimized DP cycle with 3 DP slave with a SIMODRIVE 611 universal
.
DX
Function Manual, 11/2006, 6FC5397-2BP10-2BA0
.
DX
Special functions: Cycle Times (G3)