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Siemens Simatic S7-400 User Manual

Page 308

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Analog Modules

5-92

S7-400, M7-400 Programmable Controllers Module Specifications

A5E00069467-07

Technical Specifications of the SM 431; AI 8

14 Bit

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. 500 g

Data for Specific Module

Number of inputs

For resistance-type sensor

8

4

Length of cable

Shielded

Max. 200 m

Voltages, Currents, Potentials

Rated load voltage L+

24 VDC (required only
for the supply of 2-wire
transmitters)

Reverse polarity protection

Yes

Power supply of the
transmitters

Supply current

Max. 50 mA

Short-circuit proof

Yes

Constant measured current for
resistance-type sensor

Typ. 1.67 mA

Isolation

Between channels and
backplane bus

Between the channels

Between channels and
load voltage L+

Yes

No

Yes

Permitted potential difference

Between inputs and M

ANA

(U

CM

)

8 VAC

Between the inputs (E

CM

)

8 VAC

Between M

ANA

and

M

internal

(U

ISO

)

75 VDC/60 VAC

Insulation tested

Between bus and analog
section

Between bus and chassis
ground

Between analog section
and L+/M

Between analog section
and chassis ground

Between L+/M and chassis
ground

2120 VDC

500 VDC

707 VDC

2120 VDC

2120 VDC

Current consumption

From the backplane bus

Max. 1000 mA

From the backplane bus L+

Max. 200 mA (with 8
connected, fully
controlled 2-wire
transmitters)

Power dissipation of the
module

Typ. 4.9 W

Analog Value Generation

Measuring principle

Actual-value
conversion

Integration time/conversion
time/resolution (per channel)

(Does not go into the
response time)

Parameters can be
assigned

Yes

Interference voltage
suppression f1 in Hz

None/400/60/50

Basic conversion time in
ms

52

m

s

Resolution (incl.
overrange)

14/14/14

Smoothing of the measured
values

Can be parameterized
“none – a lot”

Time constant of the input
filter

15

m

s

Basic execution time of the
module, in ms (all channels
enabled)

0.420

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