Siemens Simatic M7-400 Manual do Utilizador descarregar pdf (Página 165)

Digital Modules

4-43

S7-400, M7-400 Programmable Controllers Module Specifications

A5E00069467-07

Technical Specifications of the SM 421; DI 16 120 VAC

Dimensions and Weight

Dimensions W H D

(in millimeters)

25 290 210

Weight Approx. 650 g

Data for Specific Module

Number of inputs 16

Length of cable

• Unshielded

• Shielded

600 m

1000 m

Voltages, Currents, Potentials

Number of inputs that can be

triggered simultaneously

16

Isolation

• Between channels and

backplane bus

Yes

• Between the channels Yes

– In groups of 1

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. 0.1 A

Power dissipation of the

module

Typ. 3.0 W

Status, Interrupts, Diagnostics

Status display Green LED per

channel

Interrupts None

Diagnostic functions None

Sensor Selection Data

Input voltage

• Rated value

• For signal “1”

• For signal “0”

• Frequency range

120 V

72 to 132 VAC

0 to 20 V

47 to 63 Hz

Input current

• At signal “1”

• At signal “0”

6 to 20 mA

0 to 4 mA

Input delay

• At “0” to “1”

• At “1” to “0”

2 to 15 ms

5 to 25 ms

Input characteristic curve To IEC 61131; type 2

Connection of two-wire BEROs

• Permitted bias current

Possible

Max. 4 A

1 2 ... 160 161 162 163 164 165 166 167 168 169 170 ... 637 638

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