Siemens SIPART DR22 Manual page 21

Manual
24 V
0 V
+1
Txd
-1
Rxd
Figure 1-3 Block diagram serial interface
for RS 232 / SIPART BUS
6DR2804-8A
6DR2804-8B
D Interface relay module with 2 or 4 relays
To convert 2 or 4 binary outputs to relay contacts up to 230 V UC.
The module can be snapped onto a mounting rail on the back of the controller. The mounting
rail is delivered with the interface relay module.
One or two relay modules with 2 relays each are installed depending on the version. Every relay
has a switching contact with spark quenching in both switching branches. In AC consumers with
a very low power, the current flowing (e.g. hold current in contactors) through the spark quench-
ing capacitor (33nF) when the contact is open interferes. In this case they should be replaced
by capacitors of the same construction type, voltage strength and lower value.
The switching contact is fed to the plug terminals with 3 poles so that rest and working circuits
can be switched. The relays can be controlled directly from the controller's digital outputs by
external wiring.
SIPART DR22 6DR2210
C79000-G7476-C154-03
+7.5 V
SIPART
bus
-7.5 V
+ 7.5 V
RS 232
2
Txd
7
-7.5 V
-7.5 V
3
Rxd
8
Other connections: NC
Module with 4 BA relays
Module with 2 BA relays
1.4.2 Description of the option modules
24 V
0 V
Txd
Rxd
Rxd/
Txd
Figure 1-4 Block diagram serial interface for
RS 485
1 Technical Description
1.4 Function principle
RS 485 + 150R
RS 485
+7.5 V
+7.5 V
8
Rxd/
Txd A
+7.5 V
3
Rxd/
Txd B
2, 7 NC
Other connections: NC
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