Article number |
6ES7431-1KF20-0AB0
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SIMATIC S7-400, analog input SM 431, isolated 8 AI, resolution 14 bit, U/IResistor 8 AI, cycle time 0.416 ms |
Supply voltage |
Load voltage L+ |
● Rated value (DC) |
24 V; Only required for supplying 2-wire transmitters |
● Reverse polarity protection |
Yes |
Input current |
from load voltage L+ (without load), max. |
200 mA; for 8 connected, fully controlled 2-wire transmitters |
from backplane bus 5 V DC, max. |
1 000 mA |
Power loss |
Power loss, typ. |
4.9 W |
Analog inputs |
Number of analog inputs |
8 |
● For voltage/current measurement |
8 |
● For resistance measurement |
4 |
permissible input voltage for voltage input (destruction limit), max. |
18 V; 18 V continuous, 75 V for 1 ms (mark to space ratio 1:20) |
permissible input current for current input (destruction limit), max. |
40 mA; Permanent |
Constant measurement current for resistance-type transmitter, typ. |
1.67 mA |
Input ranges |
● Voltage |
Yes |
● Current |
Yes |
● Thermocouple |
No |
● Resistance thermometer |
No |
● Resistance |
Yes |
Input ranges (rated values), voltages |
● 1 V to 5 V |
Yes |
— Input resistance (1 V to 5 V) |
10 MΩ |
● -1 V to +1 V |
Yes |
— Input resistance (-1 V to +1 V) |
10 MΩ |
● -10 V to +10 V |
Yes |
— Input resistance (-10 V to +10 V) |
100 kΩ |
Input ranges (rated values), currents |
● -20 mA to +20 mA |
Yes |
— Input resistance (-20 mA to +20 mA) |
50 Ω |
● 4 mA to 20 mA |
Yes |
— Input resistance (4 mA to 20 mA) |
50 kΩ |
Input ranges (rated values), resistors |
● 0 to 600 ohms |
Yes |
Cable length |
● shielded, max. |
200 m |
Analog value generation for the inputs |
Integration and conversion time/resolution per channel |
● Resolution with overrange (bit including sign), max. |
14 bit; 14 / 14 / 14 |
● Integration time, parameterizable |
Yes |
● Basic conversion time (ms) |
52 µs |
● Interference voltage suppression for interference frequency f1 in Hz |
none / 400 / 60 / 50 Hz |
● Time constant of the input filter |
15 µs |
● Basic execution time of the module (all channels released) |
0.42 s |
Encoder |
Connection of signal encoders |
● for voltage measurement |
Yes; possible |
● for current measurement as 2-wire transducer |
Yes |
● for current measurement as 4-wire transducer |
Yes |
● for resistance measurement with two-wire connection |
Yes; Line resistances are also measured |
● for resistance measurement with three-wire connection |
Yes; Line resistances are also measured |
● for resistance measurement with four-wire connection |
Yes |
Errors/accuracies |
Temperature error (relative to input range), (+/-) |
0.03 %/K |
Operational error limit in overall temperature range |
● Voltage, relative to input range, (+/-) |
0.7 %; ±0.7 % at ±1 V; ±0.9 % at ±10 V, 1 to 5 V |
● Current, relative to input range, (+/-) |
0.8 %; at ±20 mA, 4 to 20 mA |
● Resistance, relative to input range, (+/-) |
1 % |
Basic error limit (operational limit at 25 °C) |
● Voltage, relative to input range, (+/-) |
0.6 %; 0.6 % at ±1 V; 0.75 % at ±10 V, 1 to 5 V |
● Current, relative to input range, (+/-) |
0.7 %; at ±20 mA, 4 to 20 mA |
● Resistance, relative to input range, (+/-) |
0.7 %; 0 to 600 ohms |
Interrupts/diagnostics/status information |
Diagnostics function |
No |
Potential separation |
Potential separation analog inputs |
● Potential separation analog inputs |
Yes; internal/external |
● between the channels |
No |
● between the channels and backplane bus |
Yes |
● Between the channels and load voltage L+ |
Yes |
Isolation |
Isolation tested with |
2 120 V DC between bus and analog section; 500 V DC between bus and local ground; 500 V DC between analog part and L+/M; 2 120 V DC between analog part and local ground; 2 120 V DC between L+/M and local ground |
Dimensions |
Width |
25 mm |
Height |
290 mm |
Depth |
210 mm |
Weights |
Weight, approx. |
500 g |