
Analog modules
5.25 Analog input module SM 431; AI 8 x 16 Bit (6ES7431-7KF00-0AB0)
S7-400 Automation System Module Data
Reference Manual, Edition 09/2009, A5E00850736-06
327
Sensor selection data
Input range (nominal values) / input impedance
Voltage
± 25 mV > 2 MΩ
± 50 mV > 2 MΩ
± 80 mV > 2 MΩ
± 100 mV > 2 MΩ
± 250 mV > 2 MΩ
± 500 mV > 2 MΩ
± 1 V > 2 MΩ
± 2.5 V > 2 MΩ
± 5 V > 2 MΩ
+ 1 to 5 V > 2 MΩ
± 10 V > 2 MΩ
Current
± 20 mA 50 Ω
+ 4 to 20 mA 50 Ω
± 10 mA 50 Ω
± 5 mA 50 Ω
± 3.2 mA 50 Ω
Thermocouple
Types B, N, > 2 MΩ
E, R, S, J, L,
T, K, U
Maximum input voltage for
voltage input (destruction limit)
35 V continuous;
75 V for max. 1 s
(duty factor 1:20)
Maximum input current for current input (destruction
limit)
32 mA
Connection of the sensor
For measuring voltage
Supported
For current measurement as 4-wire transducer
Supported
Characteristic linearization
For thermocouples
Types B, N, E, R, S, J, L, T, K, U
Temperature compensation Yes, programmable
Internal temperature compensation
Supported
Unit for temperature measurement Degrees Celsius / Degrees Fahrenheit
1
The 6ES7431-7KFOO-0AB0 does not support the high and low ranges defined in S7 for
thermocouples. When the module reaches the operational limit defined for S7, the system outputs a
corresponding underflow (32768) or overflow (327767) signal.
2
Thermocouples can be operated above the specified temperatures.
The specified accuracy improves in the lower range and at higher temperature.
The accuracy of the thermocouple module can be calculated for other temperature ranges based on
the accuracy limit values of the input voltage and the emf/°C of the thermocouple.
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