2 Technical Description
2.5 Function principle
Manual
SIPART DR21
C73000-B7476-C143-08
27
storage of the calculated variables for transmission mode of the serial interface take place.
In S-controllers, the program run is interrupted every 5 ms to be able to switch off the S-out-
puts for better resolution. The interface communication also runs in interrupt mode.
D Power supply unit
A cast, overload-protected mains transformer for 115 V or 230 V AC built into a heat sink or
a primary clocked plug-in type power supply unit for 24 V UC built into a heat sink generates
the secondary internal supply voltages +24 V, +5 V and U
ref
from the power supply. The
metal body rests on protective conductors (protection class
I).
The power supply and internal supply voltages are isolated from each other by safe
separation.
The internal supply voltages are function low voltages.
Since no other voltages are generated in the instrument, these statements apply to all field
signal lines with the exception of relay connection lines (used standards see chapter 2.6
Technical data, page 34).
D Configuring
The controller has a large number of prepared functions for controlling processing plants.
The user programs the instrument himself by selecting the desired functions or setting para-
meters by setting structure switches. The total functioning of the instrument is given by the
combination of the individual structure switches or parameter settings. No programming
knowledge is necessary (see Operation, chapter 5, page 149).
All settings are made without exception on the front operating panel of the SIPART DR21 or
the serial interface.
The job-specific program written in this way is saved in the non-volatile user program mem-
ory.
The instrument is configured as a fixed value controller in the factory setting. This setting
can be restored with the ”APSt”-function at any time.
The following parameterization- and structuring modes are available for configuring the
SIPART DR21 controller.
onPA The transmission properties of the controller and with these the process course
are determined with the online-parameters. They can be changed during control
operation (online)
oFPA The offline-parameters determine the basic functions such as display elements,
limit values, safety values. The controller is blocked (offline) while they are being
set, the last value of the manipulated variable is held.
StrS The instrument structure, e.g. fixed value controller or follow-up controller is de-
termined with the structure switches. The controller is blocked (offline) while
they are being set, the last value of the manipulated variable is held.
APSt The all preset-function restores the factory setting.
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