
Analog modules
5.21 Analog input module SM 431; AI 8 x 14 Bit (6ES7431-1KF20-0AB0)
S7-400 Automation System Module Data
274 Reference Manual, Edition 09/2009, A5E00850736-06
5.21 Analog input module SM 431; AI 8 x 14 Bit (6ES7431-1KF20-0AB0)
5.21.1 Features
Overview
The analog input module SM 431; AI 8 x 14 Bit has the following features:
● Rapid A/D changeover, therefore particularly suitable for highly dynamic processes
● 8 inputs for voltage/current measurement
● 4 inputs for resistance measurement
● Various measuring ranges, adjustable in parallel
● Resolution 14 bits
● Supply voltage: 24 VDC required only for the connection of 2-wire transducers
● Analog section isolated from CPU
● The maximum permissible common mode voltage between the channels and between
the reference potential of the connected sensors and M
ANA
is 8 VAC
Block diagram of the SM 431; AI 8 x 14 Bit
CH0
CH1
CH6
CH7
+5V
0V
0V
- 15V
+ 5V
+ 15V
L+
M
ENABLE
A
D
MANA
MANA
Measuring
range
module 0
Measuring
range
module 3
MULTIPLEXER
Bus control
Bus S7-400
Bus S7-400
Bus S7-400
Figure 5-28 Block diagram of the SM 431; AI 8 x 14 Bit
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