Siemens Simatic S7-400 User Manual
Page 289
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
W;
four
Ć
conductor
measurement (in the range
of 600
W
)
"
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
W;
four
Ć
conductor
measurement (in the range
of 600
W
)
"
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%