
Analog Modules
5-79
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
in the 80 mV input range
and with thermocouples
Max. 200 m
Max. 50 m
Voltages, Currents, Potentials
Rated load voltage L+ 24 VDC (required only
for the supply of
two-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
)
120 VAC
• Between the inputs (E
CM
) 120 VAC
• Between M
ANA
and
M
internal
(U
ISO
)
75 VDC / 60 VAC
Insulation tested with
• Between bus and L+/M
• 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
2120 VDC
500 VDC
707 VDC
2120 VDC
2120 VDC
Current consumption
• From the backplane bus Max. 600 mA
• From the backplane bus L+ Max. 200 mA (with 8
connected, fully
controlled two-wire
transmitters)
Power dissipation of the
module
Typ. 3.5 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
20.1/23.5
• Additional conversion time
for measuring resistance in
ms
40.2/47
• Additional conversion time
for open-circuit monitoring
in ms
4.3/4.3
• Additional conversion time
for measuring resistance
in ms
5.5/5.5
• Resolution including sign
– Smoothing activated
14/14 bit
16/16 bit
Smoothing of the measured
values
Parameters can be
assigned in 4
stages
Basic execution time of the
module, in ms (all channels
enabled)
161/188
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