Siemens SINUMERIK 840Di sl Commissioning Manual page 246

PROFIBUS DP Communication
8.3 Creating a PROFIBUS configuration
Master application cycle T
The "Master application cycle T
application (NC position controller) and the isochronous DP cycle.
Using ratios other then 1:1, the dead times of the position controller can be reduced if NC
hardware of the lower performance range is used.
NOTICE
On a DP slave S120 used with SINUMERIK 840Di sl, the ratio between the master
application cycle TMAC and DP cycle time TDP must be 1:1.
Master application cycle = DP cycle
Dialog: Continuation
Actual value acquisition Ti
The actual-value acquisition Ti parameter defines the time at which the actual value (actual
position value) can be read in from a DP slave S120.
Note
You are strongly recommended to use the same value for the time of actual value acquisition
Ti for all DP slaves S120, in particular if the axes interpolate.
NOTICE
The following condition must be observed for the time of actual value acquisition TI:
DP cycle >= actual value acquisition >= base time
Dialog: Continuation
246
MAPC
Tab: Cycle synchronization
Master application cycle [ms]:
Factor: 1
Tab: Cycle synchronization
Actual value acquisition [ms]:
Factor: Factor
parameter specifies the integer ratio between the master
MAPC
Commissioning Manual, 05/2008, 6FC5397–4CP10–4BA0
Manual