Siemens SIMATIC S7-300 Hardware And Installation Manual page 140

Commissioning
Programming, status/control via PROFIBUS
As an alternative to the MPI interface, you can program the CPU or execute the
PG's status and control functions via the PROFIBUS-DP interface.
Note
The use of Status and Control function via the PROFIBUS-DP interface extends
the DP cycle.
Equidistance
As of STEP 7 V 5.x you can configure equidistant lengths for PROFIBUS subnet
bus cycles. Details on equidistance are found in the Step 7 Online Help.
Startup of the DP master system
CPU 315-2 DP / 316-2 DP / 31xC-2 DP is
Customize the Startup monitoring time for
DP slaves in parameter Monitoring time
for parameter transfer to modules.
That is, the DP slaves must start up within the set time and be configured by the CPU (as
DP master).
PROFIBUS address of the DP master
With CPU 31x-2 DP/31xC-2 DP do not set
8-28
DP master
S7-300 Programmable Controller Hardware and Installation
CPU 318-2 DP is DP master
Customize the Startup monitoring time for
DP slaves in parameters Monitoring time
for parameter transfer to modules and
Module reports ready.
as PROFIBUS address.
"126"
A5E00105492-01