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Technical specifications of the – Siemens Simatic S7-400 User Manual

Page 141

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Digital Modules

4-19

S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07

Technical Specifications of the

SM 421; DI 32 x 24 VDC

Programming package

Associated programming
package

As of STEP 7 V 2.0

Dimensions and Weight

Dimensions W

H

D

(in millimeters)

25

290

210

Weight

Approx. 600 g

Data for Specific Module

Number of inputs

32

Length of cable

Unshielded

Shielded

Max. 600 m

Max. 1000 m

Voltages, Currents, Potentials

Power rated voltage of the
electronics L+

24 VDC

Reverse polarity protection

Yes

Power failure buffering

None

Number of inputs that can be
triggered simultaneously

32

Isolation

Between channels and
backplane bus

Yes

Between channels and
power supply of the
electronics

No

Between the channels

No

Permitted potential difference

Between the different
circuits

75 VDC / 60 VAC

Insulation tested with

Channels against
backplane bus and load
voltage L+

500 VDC

Current consumption

From the backplane bus

Max. 30 mA

From supply voltage L+

Max. 30 mA

Power dissipation of the
module

Typ. 6 W

Status, Interrupts, Diagnostics

Status display

Green LED per
channel

Interrupts

None

Diagnostic functions

None

Substitute value can be applied

No

Sensor Selection Data

Input voltage

Rated value

For signal “1”

For signal “0”

24 VDC

11 V to 30 V

–3 V to 5 V

–30 V to 5 V as of
version 03

Input current

At signal “1”

6 mA to 8 mA

Input delay

At “0” to “1”

At “1” to “0”

1.2 ms to 4.8 ms

1.2 ms to 4.8 ms

Input characteristic curve

To IEC 61131; type 2

Connection of two-wire BEROs

Possible

Permitted bias current

Max. 2.5 mA

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