
Analog modules
5.21 Analog input module SM 431; AI 8 x 14 Bit (6ES7431-1KF20-0AB0)
S7-400 Automation System Module Data
278 Reference Manual, Edition 09/2009, A5E00850736-06
Status, interrupts, diagnostics
Interrupts None
Diagnostic functions None
Injection of substitution values No
Sensor selection data
Input range (nominal values) / input impedance
Voltage
± 1 V / 10 MΩ
± 10 V / 10 MΩ
1 to 5 V / 10 MΩ
Current
± 20 mA / 50 Ω
4 to 20 mA / 50 Ω
Resistance
0 to 600 Ω / 10 MΩ
Permissible voltage at voltage input (destruction limit) Max. 18 V continuous;
75 V for 1 ms (cycle factor 1 : 20)
Permissible current at current input (destruction limit) 40 mA continuous
Connection for signal sensors
For voltage measurement
Supported
For current measurement
– As 2-wire transducer
– As 4-wire transducer
Supported
Supported
For resistance measurement
– With 2-conductor connection
– With 3-conductor connection
– With 4-conductor connection
Supported: cable resistances are also
measured
Supported
Load of the 2-wire transducer
Max. 750 Ω
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