Siemens Simatic M7-400 Manual do Utilizador descarregar pdf (Página 141)

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

1 2 ... 136 137 138 139 140 141 142 143 144 145 146 ... 637 638

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