Siemens SIMATIC S7-400 Reference Manual page 282

Analog modules
5.23 Analog input module SM 431; AI 16 x 16 Bit (6ES7431-7QH00-0AB0)
● Current
● Resistance
● Thermocouples
● Resistance thermometer
Permissible input voltage for voltage input (destruction
limit)
Permissible input current for current input (destruction
limit)
Sensor connection
● For voltage measurement
● For current measurement
● For resistance measurement
● Load of 2-wire transducer
Characteristic curve linearization
● For thermocouples
282
– As 2-wire transducer
– As 4-wire transducer
– With 2-wire connection
–
– With 3-wire connection
– With 4-wire connection
0 to 20 mA / 50 Ω
± 5 mA / 50 Ω
± 10 mA / 50 Ω
± 20 mA / 50 Ω
4 to 20 mA / 50 Ω
0 to 48 Ω / 1 MΩ
0 to 150 Ω / 1 MΩ
0 to 300 Ω / 1 MΩ
0 to 600 Ω / 1 MΩ
0 to 6000 Ω / 1 MΩ (can be used up to 5000
Ω)
TC type B / 1 MΩ
TC type R / 1 MΩ
TC type S / 1 MΩ
TC type T / 1 MΩ
TC type E / 1 MΩ
TC type J / 1 MΩ
TC type K / 1 MΩ
TC type U / 1 MΩ
TC type L / 1 MΩ
TC type N / 1 MΩ
Pt 100 / 1 MΩ
Pt 200 / 1 MΩ
Pt 500 / 1 MΩ
Pt 1000 / 1 MΩ
Ni 100 / 1 MΩ
Ni 1000 / 1 MΩ
Maximum 18 V continuous;
75 V for 1 ms (cycle clock ratio 1 : 20)
40 mA
Possible
Possible
Possible
Possible;
line resistance is also measured
Possible
Possible
Maximum 750 Ω
Configurable
Type B, R, S, T, E, J, K, U, L, N
S7-400 Automation System Module Data
Reference Manual, Ausgabe 11/2016, A5E00850736-08