Acyclic Data Transfer - Siemens SITRANS P DS III Operating Instructions Manual

Configuration/project engineering

9.3 Acyclic data transfer

Note
The device state can be simulated using SIMATIC PDM. This allows you to check the
reaction of the automation system to an error.
9.3 Acyclic data transfer
Acyclic data transmission is used primarily for the transmission of parameters:
● During commissioning
● During service
● In batch processes
● To display additional measurement data which is not sent during cyclic user data
transmission, e.g. raw pressure value
The data traffic between a class 2 master and the field device occurs over a so-called C2
connection. So that multiple class 2 masters can access the same pressure transmitter at
the same time, the device supports up to four C2 connections. However, you must ensure
that the same data is not being written.
170
SITRANS P DS III/P410 with PROFIBUS PA
Operating Instructions, 02/2016, A5E00053276-08