Siemens Simatic M7-400 Manual do Utilizador Página 289

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Analog Modules
5-73
S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07
Technical Specifications of the SM 431; AI 8 13 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+ Not required
Constant measured current for
resistance-type sensor
Typ. 1.67 mA
Isolation
Between channels and
backplane bus
Between the channels
Yes
No
Permitted potential difference
Between inputs and M
ANA
(U
CM
)
30 VAC
Between the inputs (E
CM
) 30 VAC
Between M
ANA
and
M
internal
(U
ISO
)
75 VDC / 60 VAC
Insulation tested with
Between bus and analog
section
Between bus and chassis
ground
Between analog section
and chassis ground
2120 VDC
500 VDC
2120 VDC
Current consumption
From the backplane bus Max. 350 mA
Power dissipation of the
module
Typ. 1.8 W
Analog Value Generation
Measuring principle Integrative
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
60/50
Integration time in
milliseconds
16.7/20
Basic conversion time in
ms
23/25
Resolution including sign 13/13 Bit
Smoothing of the measured
values
Not possible
Basic execution time of the
module, in ms (all channels
enabled)
184/200
Suppression of Interference, Limits of Error
Interference voltage suppression for f = nx (f1 "1%),
(f1 = interference frequency) n = 1, 2, ...
Common-mode
interference
(U
CM
< 30 V)
> 100 dB
Series-mode interference
(peak value of
interference < rated value
of input range)
> 40 dB
Crosstalk between the inputs
> 50 dB
Operational limit (in the entire temperature range, with
reference to the input range)
Voltage input
" 1 V
" 10 V
1 V to 5 V
" 1.0%
" 0.6%
" 0.7%
Current input
" 20 mA
4 mA to 20 mA
" 1.0%
" 1.0%
Resistance measurement
0 to 500  fourconductor
measurement (in the range
of 600)
" 1.25%
Basic error (operational limit at 25 °5C, referred to input
range)
Voltage input
" 1 V
" 10 V
1 V to 5 V
" 0.7%
" 0.4%
" 0.5%
Current input
" 20 mA
4 mA to 20 mA
" 0.7%
" 0.7%
Resistance measurement
0 to 500  fourconductor
measurement (in the range
of 600)
" 0.8%
Temperature error with reference to the input range
In the resistance
measurement range
" 0.02% K
In all the other
measurement ranges
" 0.007% K
Linearity error (with reference
to the input range)
" 0.05% K
Repeat accuracy (in the steady
state at 25
°C, referred to the
input range)
" 0.1%
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