Application Examples For Configuring The Controller; Mains Voltage; Input Circuits; Output Circuits - Siemens SIPART DR21 Manual

Manual
7

Application examples for configuring the controller

7.1

General

Frequent applications/connections of the SIPART DR21 controllers in the form of configuration
examples are listed below. The circuits are sorted according to their application S-controller,
K-controller, control unit/process display or two-position controller. All input and output connec-
tions and the order numbers of the respective required controllers or accessory modules are
stated. A principle circuit diagram of the control circuit and a short description make compre-
hension easier
We have purposely described the simple applications in very great detail to help the technician
above all who only needs to design these circuits very occasionally.

Mains voltage

As shown, the power supply must be fused and the PE conductor connected. The permissible
power supply range must be stated respectively with the type number of the controller.
Fuses and connecting leads are not supplied with the controllers.

Input circuits

A wide variety of input circuits are shown. Please note that the supply voltage remaining for the
transmitter may only be 15 V DC in the worst case when a two-wire transmitter is fed by the
SIPART DR21 and the analog inputs AI1/AI2 are used at the same time.

Output circuits

The outputs are represented uniformly. In S-controllers, the switching outputs are output via
relays which may be loaded with a max. 250 V AC. If the position outputs of the S-controller are
desired with digital signals, the digital outputs DO1 and DO2 must be used.
If inductances (e.g. positioning motors, contactors, etc.) are switched with the planned
relay outputs, an adequate interference suppression must be provided for on the system
side by wiring with RC-combinations or other suitable means in order to achieve EMC
protection aims.
SIPART DR21
C73000-B7476-C143-08
7 Application examples for configuring the controller
7.1 General
193