1 Technical Description
1.4 Function Principle
1.4.2 Description of the Option Module
Manual
18
SIPART DR24 6DR2410
C79000-G7476-C153-03
The interface module 6DR2803--8C offers electrical isolation between Rxd/Txd and the control-
ler. Switching can be performed between RS 232, SIPART bus and RS 485 with a plug--in
bridge.
A detailed technical description of the telegram traffic is available for creating an interface soft-
ware.
24 V
0 V
-1
+1
+7.5 V
---7.5 V
+ 7.5 V
---7.5 V
-7.5 V
2
3
7
8
Other connections: NC
Other connections: NC
Rxd/
Txd
Rxd/
Txd B
3
Rxd/
Txd A
NC
2, 7
8
SIPART
bus
RS 485
RS 485+150R
RS 232
Txd
Rxd
Txd
Rxd
24 V
0 V
Txd
Rxd
+7.5 V
+7.5 V
+7.5 V
Figure 1--3
Block diagram of serial interface for
RS 232/SIPART BUS
Figure 1--4
Block diagram of serial interface for
RS 485
6DR2804-8A
4 BA relays
6DR2804-8B
2 BA relays
D
Interface relay module with 2 or 4 relays
To convert 2 or 4 digital 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, it is possible that the current flowing (e.g. hold current in contactors) through
the spark quenching 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.
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