
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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