Siemens SIMATIC RF640A, Системное руководство

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Readers
5.3 SIMATIC RF650R
SIMATIC RF600
122
System Manual, 11/2018, J31069-D0171-U001-A21-7618
5.3.1.4 Switching scheme for the DI/DQ interface
Connection possibilities
You can connect the reader in different ways. In general, the outputs and inputs should be
connected as follows:
Output (DO 0 ... 3)
● Each output is rated for 0.5 A current and is electronically protected.
● 4 digital outputs can be operated simultaneously each with up to 0.5 A (up to 1 A in total).
With a total current > 1 A, you need to use an external power supply.
● The outputs are optically isolated through optocouplers.
input (DI 0 ... 3)
● The inputs are optically isolated through optocouplers.
● Level
–
Low: 0 ... 7 V
– High: 15 ... 24 V
● Sampling rate
< 20 ms
The following diagrams illustrate various connection possibilities.
Note
Minimum time between changes
Note that changes on the I/O interface that are not applied for at least 1.5 seconds are not
detected by the reader.