Siemens SITRANS P DS III - Acyclic Data Transfer

Configuration/project engineering
9.3 Acyclic data transfer
SITRANS P DS III with PROFIBUS PA
164 Operating Instructions, 06/2013, A5E00053276-07
Byte
Bit
Meaning of "1"
Cause
Measure
7 Ident number changed You changed the
parameter "PROFIBUS
Ident Number" during
cyclical operation. The
device signals the change
to the ident number and
shows a shutdown
warning. In case of a
restart, the device will no
longer participate in
cyclical user data
exchange unless the
system configuration is
changed.
Make a change to the
configuration data (change
the GSD file) so that it
matches the ident number
configured in the device.
Note
The device state can be simulated using SIMATIC PDM. This allows you to check the
reaction of the automation system t
o 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 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.