Siemens SIMATIC ET 200AL, System Manual

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Parameter assignment/addressing
3.3 Network settings
PROFIBUS with STEP 7 V13
Function Manual, 12/2014, A5E03775446-AC
47
DP (recommended profile)
Select the "DP" profile if only devices meeting the requirements of the standard
EN 61158-6-3 are connected to the PROFIBUS subnet. The setting of the bus parameters
has been optimized for these devices. These include devices with DP master and DP slave
interfaces of SIMATIC S7 as well as distributed I/O devices from third parties.
Note
Profile for constant bus cycle time and isochronous mode
DP is the recommended profile for the configuration of constant bus cycle time and
isochronous mode.
Standard
Compared with the "DP" profile, the "Standard" profile gives you the option to take into
consideration devices of another project or devices that have not been configured here for
calculation of the bus parameters. The bus parameters are then calculated with a simple
algorithm that was not optimized.
Universal (DP/FMS) (FMS is not supported)
Select the "Universal (DP/FMS)" profile if individual devices in the PROFIBUS subnet use
the FMS service (e.g., CP 343-5, PROFIBUS FMS devices).
As with the "Standard" profile, here, too, you have the option to take additional devices into
consideration for calculation of the bus parameters.