Siemens Simatic S7-300 Manual - Halaman 4

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Terminal assignment diagram for the redundant supply of sensors

The figure below shows how sensors can additionally be supplied by means of Vs

with a redundant voltage source – for example, via another module.

Figure 2

Terminal assignment diagram of the resistor wiring of the sensors

To detect a wire break, it is necessary to wire sensor contacts with a resistor.

Figure 3

Short-circuit-

proof driver

Digital input

module

Terminal assignment diagram for the redundant supply of sensors of the SM

321; DI 16

DC 24 V

L +/ V

15 kW ... 18 kW

Terminal assignment diagram of the resistor wiring of the sensors of the SM

321; DI 16

DC 24 V

Product Information on the Manual S7-300 Module Specifications, Edition 11/2002

L+

1 L+

2 L+

to the sensors

E x.x

A5E00213444-02