Overview Of Operating Functions; Measurement - Siemens SITRANS P DS III Operating Instructions Manual

Operator control functions via PROFIBUS

7.2 Overview of operating functions

How it works
The function block processes the measured values from the transducer for pressure. If the
status of the measured values is "bad", the setting of the failure behavior decides whether
this value or the last "good" value is forwarded for totalizing.
The measured value now pass through the specified summation direction. The measured
values are fed to a forward flow, reverse flow or net counting function.
The measured values are then integrated over time so that the flow can be calculated for a
specified time segment. Adherence to the limit values is also checked. Here, it is also
possible to reset the counted total to a preload value.
You can reset or initialize the totalizer function block not only with acyclic services. You can
configure the totalizer function block so that you can reset or initialize it from the user
program in cyclic data traffic.
In the Mode and status processing, select Target mode. Using the target mode, you can
choose between output of the automatically acquired measured value (AUTO setting) or a
manually set simulation value (MAN setting).
The possible units correspond to the volume and mass values of the transducer for pressure.
See also
Configuration of user data (Page 159)
Units of the pressure transducer block (Page 102)
7.2 Overview of operating functions
A PC software program like SIMATIC PDM is necessary for operation over PROFIBUS PA.
How to do this is explained in the corresponding user manual and the online help. The full
functionality of the pressure transmitter is available via PROFIBUS PA communication.
7.3

Measurement

In measurement mode, measurement values such as pressure, fill level or flow are available
on the PROFIBUS-PA interface. PROFIBUS PA communication is signaled by the
communication symbol "o" on the display.
See also
Display elements (Page 73)
106
SITRANS P DS III with PROFIBUS PA
Operating Instructions, 06/2013, A5E00053276-07