Siemens Simatic S7-1500 Manual - Halaman 14

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Wiring

3.1 Wiring and block diagram

Resistor circuitry of the encoders

To detect a wire break, it is necessary that enough quiescent current is flowing even when

the encoder contacts are open. Connect a resistor to the encoder contacts for this reason,

see figure below.

Rated input voltage:

24 VUC

48 VUC

125 VUC

Figure 3-2

Resistance:

16 kΩ ... 21 kΩ with 1.0 W

37 kΩ ... 53 kΩ with 0.5 W

101 kΩ ... 156 kΩ with 0.25 W

Resistor circuitry of the encoders

Digital input module DI 16x24...125VUC HF (6ES7521-7EH00-0AB0)

Manual, 12/2016, A5E35681478-AC