Siemens S7-400PLC Especificações descarregar pdf (Página 112)

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101

Digital modules

4.8 Digital input module SM 421; DI 16 x DC 24 V (6ES7421-7BH01-0AB0)

S7-400 Automation System Module Data

112 Reference Manual, Edition 09/2009, A5E00850736-06

Wiring diagram of the redundant sensor supply

The figure below shows how an additional redundant voltage source can be used to supply

sensors via Vs (for example, using another module.)

L+

1 L+

2 L+

Short-circuit-

proof driver

Digital input

module

to the sensors

Figure 4-4 Wiring diagram for the redundant supply of sensors of the SM 421; DI 16 x DC 24 V

Specifications of the SM 421; DI 16 x DC 24 V

Dimensions and weight

Dimensions W x H x D (mm) 25 x 290 x 210

Weight Approx. 600 g

Module-specific data

Number of inputs 16

Cable length

 Unshielded, input delay

0.1 ms

0.5 ms

3ms

Maximum 20 m

maximum 50 m

maximum 600 m

 Shielded, input delay

0.1 ms

0.5 ms

3ms

Maximum 30 m

maximum 70 m

maximum 1000 m

Voltages, currents, electrical potentials

Nominal supply voltage of the electronics and sensor L+ 24 VDC

 Reverse polarity protection

Yes

Number of simultaneously controlled inputs 16

Electrical isolation

 Between channels and the backplane bus

Yes

 Between channels and electronics power supply

 Between channels

In groups of

Yes

Permissible potential difference

 Between different circuits

75 VDC, 60 VAC

Isolation test voltage

 Channels against backplane bus and load voltage

L+

500 VDC

 Channel groups between themselves

500 VDC

1 2 ... 107 108 109 110 111 112 113 114 115 116 117 ... 485 486

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