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