Siemens Simatic M7-400 Manual do Utilizador descarregar pdf (Página 341)

100

101

Analog Modules

5-125

S7-400, M7-400 Programmable Controllers Module Specifications

A5E00069467-07

Technical Specifications of the SM 431; AI 8 RTD 16 Bit

Dimensions and Weight

Dimensions W H D

(in millimeters)

25 290 210

Weight Approx. 650 g

Data for Specific Module

Number of inputs

• For resistance-type sensor

Length of cable

• Shielded Max. 200 m

Voltages, Currents, Potentials

Constant current for

resistance-type sensor

Max. 1 mA

Isolation

• Between channels and

backplane bus

Yes

Permitted potential difference

• Between M

ANA

and

internal

ISO

)

120 VAC

Insulation tested with 1500 VAC

Current consumption

• From the backplane bus Max. 650 mA

Power dissipation of the

module

Typ. 3.3 W

Analog Value Generation

Measuring principle Integrative

Integration/conversion time/

resolution (per channel)

• Parameterizable

(Does not go into the

response time)

Yes

• Basic conversion time in

22/25

• Additional conversion time

for measuring resistance,

in ms

Max. 200

• Resolution including sign 16/16 bit

• Noise suppression

for interference frequency

f1 in Hz

60/50

Smoothing of the measured

values

Parameters can be

assigned in 4 stages

Basic response time of module

(all channels enabled)

22/25 ms

Suppression of interference, Limits of Error

Noise suppression for f = n (f1 "1%),

(f1 = interference frequency) n = 1, 2, etc.

• Common-mode

interference (U

< 120V)

• Series-mode interference

(peak value of interference

< rated value of the input

range)

> 100 dB

> 50 dB

Crosstalk between the inputs

> 70 dB

Operational limit (over entire temperature range, referred

to 0 to 60 C input range)

• RTD input " 1.0 °C

Basic error (operational limit at 25 °C, referred to input

range)

• RTD input " 0.5 °C

Temperature error (with

reference to the input range)

" 0.007%/K

Linearity error (with reference

to the input range)

" 0.2 °C

Repeat accuracy (in the steady

state at 25

°C, referred to the

input range)

" 0.2 °C

Status, Interrupts, Diagnostics

Interrupts

• Hardware interrupt when

limit has been exceeded

Parameters can be

assigned

• Diagnostic Interrupt Parameters can be

assigned

Diagnostic functions Parameters can be

assigned

• Group error display

– For internal fault

– For external fault

Red LED (INTF)

Red LED (EXTF)

• Diagnostic information can

be displayed

Possible

Data for Selecting a Sensor

Input range (rated values) input

resistance

• Resistance thermometer Pt 100, Pt 200, Pt 500,

Pt 1000, Ni 100,

Ni 1000

• Maximum input voltage for

voltage input (destruction

limit)

35 V continuous;

75 V for max. 1 s

(duty factor 1:20)

Connection of the sensor

• For measuring resistance

With three-conductor

terminal

Possible

With four-conductor

terminal

Possible

Characteristic linearization

• For resistance

thermometer

Pt 100,0,00385 to DIN

IEC 751

Ni 100, 0,00618 to DIN

43760

Unit for temperature

measurement

Degrees Celsius;

degrees Fahrenheit

1 2 ... 336 337 338 339 340 341 342 343 344 345 346 ... 637 638

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