Analog Modules
5-77
S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07
5.19 Analog Input Module SM 431; AI 8 14 Bit;(6ES7 431-1KF10-0AB0)
Characteristics
The analog input module SM 431; AI 8 14 Bit has the following features:
8 inputs for voltage/current measurement
4 inputs for resistance and temperature measurement
Unlimited measuring range selection
14-bit resolution
Particularly suitable for measuring temperatures
Temperature sensor types can be parameterized
Linearization of the sensor characteristic curves
Supply voltage 24 VDC required only for the connection of 2-wire transmitters
Analog section isolated from CPU
The maximum permissible common mode voltage between the channels and
between the channel and the central ground point is120 VAC

Block Diagram of the SM 431; AI 8 14 Bit

CH0
CH1
CH6
CH7
+5V
0V
0V
– 15V
+ 5V
+ 15V
L+
M
Bus S7-400
Bus control
ENABLE
MULTIPLEXER
OPTO RELAY
A
D
Meas.
range
module 0
Meas.
range
module 3
Bus S7-400
Bus S7-400
Figure 5-27Block Diagram of the SM 431; AI 8 x 14 Bit