Siemens SIMATIC RF610T ATEX System Manual page 174

Readers
5.5 SIMATIC RF680R
i i nput (DI 0 ... 3)
The inputs are optically isolated through optocouplers.
Level
– Low: 0 ... 7 V
– High: 15 ... 24 V
The following diagrams illustrate various connection possibilities.
Note
M M inimum time between changes
Note that changes on the DI/DQ interface that are not applied for at least 1.5 seconds are
not detected by the reader.
Voltage infeed from internal source (no electrical isolation)
Figure 5-25 Circuit example 1: Digital inputs
Alternative connection possibilities:
Pin 2 (VCC) to Pin 9 DI Common
Pin 1 GND to busbar inputs
174
System Manual, 06/2019, J31069-D0171-U001-A22-7618
SIMATIC RF600