Siemens Simatic ET 200S Operating Instructions Manual page 135

2. DP master system settings:
Figure 7-2
ET 200S
Operating Instructions, 12/2005, A5E00515771-03
DP master "Object properties" > "General" tab > "Properties" button > "Parameter" tab >
"Properties" button > "Network settings" tab > "Options" button
– Activate constant bus cycle time on the DP master system
– Set the length of the constant bus DP cycle (max. 32 ms)
– Set "Times Ti and To for all DP slaves equal" (causes a synchronization of the I/O
data of the various DP slaves)
– Times Ti and To can be set separately. Recommendation: Recommendation: accept
the standard settings Ti and To.
Dialog box options
Note
The "recalculate" button enables you to recalculate a value for the constant DP cycle
from STEP 7 that takes the current PROFIBUS DP configuration into account. This value
is then automatically entered in the fields "Constant DP bus cycle time", Time Ti (...)" and
"Time To (...)".
7.2 Cycle synchronization on the PROFIBUS DP
Functions
7-5