Siemens SIMATIC RF200 System Manual page 150

Readers
5.8 SIMATIC RF290R
Digital input (DI):
The opto-coupler input is electrically isolated from the reader electronics. The external 24 V
must be connected to the DI according to the circuit diagram. Make sure that the polarity of
the 24 V is correct. The current is limited to < 10 mA by the integrated resistor.
NOTICE
Reader may be damaged
If you exceed the maximum permitted supply voltage, the reader may be damaged. Make
sure that the input voltage does not exceed the maximum permitted supply voltage of the
reader.
Digital output (DO):
At the relay output, a NO contact is available. The output is electrically isolated from the
reader electronics and therefore needs to be supplied externally.
NOTICE
Reader may be damaged
If you exceed the maximum permitted voltage of 24 V / 1 A at the relay output, the reader
may be damaged. Make sure that the voltage does not exceed 24 V.
The output is intended only for switching resistive loads. If it is used to switch inductive
loads, the reader may be damaged. Make sure that if inductive loads occur, the relay
contacts are protected by an external suppressor circuit.
150
System Manual, 07/2017, J31069-D0227-U001-A9-7619
SIMATIC RF200