Siemens Simatic M7-400 Reference Manual page 293

5.19 Analog Input Module SM 431; AI 8
(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
CH0
CH1
CH6
CH7
Figure 5-27 Block Diagram of the SM 431; AI 8 x 14 Bit
S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07
14 Bit
Meas.
range
module 0
Meas.
range
module 3
+ 5V
+ 15V
L+
0V
M
– 15V
14 Bit;
D
A
ENABLE
+5V
0V
Analog Modules
Bus S7-400
Bus S7-400
Bus S7-400
5-77