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Siemens Simatic S7-400 User Manual

Page 180

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Digital Modules

4-58

S7-400, M7-400 Programmable Controllers Module Specifications

A5E00069467-07

Technical Specifications of the SM 421; DI 32

120 VUC

Dimensions and Weight

Dimensions W

H

D (mm)

25

290

210

Weight

Approx. 600 g

Data for Specific Module

Number of inputs

32

Length of cable

Unshielded

Shielded

600 m

1000 m

Voltages, Currents, Potentials

Rated load voltage L+

79 to 132 VAC

80 to 132 VDC

Reverse polarity protection

Yes

Number of inputs that can be
triggered simultaneously

32

Isolation

Between channels and
backplane bus

Yes

Between the channels

Yes

In groups of

8

Permitted potential difference

Between M

internal

and the

inputs

120 VAC

Between the inputs of the
different groups

250 VAC

Insulation tested with

1500 VAC

Current consumption

From the backplane bus

Max. 0.2 A

Power dissipation of the
module

Typ. 6.5 W

Status, Interrupts, Diagnostics

Status display

Green LED per
channel

Interrupts

None

Diagnostic functions

None

Data for Selecting a Sensor

Input voltage

Rated value

For signal “1”

For signal “0”

120 VUC

79 to 132 VAC

80 VDC to 132 VDC

0 to 20 V

Frequency range

47 to 63 Hz

Input current

At signal “1”

At signal “0”

2 mA to 5 mA

0 to 1 mA

Input delay

At “0” to “1”

At “1” to “0”

5 to 25 ms

5 to 25 ms

Input characteristic curve

To IEC 61131; type 1

Connection of two-wire BEROs

Permitted bias current

Possible

Max.1 mA

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