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| Article number | 6ES7431-7QH00-0AB0 | 6ES7431-7KF00-0AB0 | 6ES7431-7KF10-0AB0 |
| SIMATIC S7-400, SM 431 | SM 431, 8AI, U/I/THERMO, 16BIT | SM 431, 8AI, RESIST./PT100, 16BIT, | |
| 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. | 400 mA; for 16 connected, fully controlled 2-wire transmitters | ||
| from backplane bus 5 V DC, max. | 700 mA | 1 200 mA | 650 mA |
| Power loss | |||
| Power loss, typ. | 4.5 W | 4.6 W | 3.3 W |
| Analog inputs | |||
| Number of analog inputs | 16 | 8 | 8 |
|
● For voltage/current measurement
|
16 | 8 | |
|
● For resistance measurement
|
8 | 8 | |
| 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) | 35 V; 35 V continuous, 75 V for max. 1 s (mark to space ratio 1:20) | 35 V; 35 V continuous, 75 V for max. 1 s (mark to space ratio 1:20) |
| permissible input current for current input (destruction limit), max. | 40 mA | 32 mA | |
| Constant measurement current for resistance-type transmitter, typ. | 1.67 mA | 1 mA | |
| Input ranges | |||
|
● Voltage
|
Yes | Yes | No |
|
● Current
|
Yes | Yes | No |
|
● Thermocouple
|
Yes | Yes | No |
|
● Resistance thermometer
|
Yes | No | Yes |
|
● Resistance
|
Yes | No | Yes |
| Input ranges (rated values), voltages | |||
|
● 1 V to 5 V
|
Yes | Yes | |
|
— Input resistance (1 V to 5 V)
|
1 MΩ | > 2 000 ohms | |
|
● -1 V to +1 V
|
Yes | Yes | |
|
— Input resistance (-1 V to +1 V)
|
1 MΩ | ||
|
● -10 V to +10 V
|
Yes | Yes | |
|
— Input resistance (-10 V to +10 V)
|
1 MΩ | ||
|
● -100 mV to +100 mV
|
Yes | ||
|
● -2.5 V to +2.5 V
|
Yes | Yes | |
|
— Input resistance (-2.5 V to +2.5 V)
|
1 MΩ | ||
|
● -20 mV to +20 mV
|
Yes | ||
|
● -25 mV to +25 mV
|
Yes | ||
|
— Input resistance (-25 mV to +25 mV)
|
1 MΩ | ||
|
● -250 mV to +250 mV
|
Yes | Yes | |
|
— Input resistance (-250 mV to +250 mV)
|
1 MΩ | ||
|
● -5 V to +5 V
|
Yes | Yes | |
|
— Input resistance (-5 V to +5 V)
|
1 MΩ | ||
|
● -50 mV to +50 mV
|
Yes | Yes | |
|
— Input resistance (-50 mV to +50 mV)
|
1 MΩ | ||
|
● -500 mV to +500 mV
|
Yes | Yes | |
|
— Input resistance (-500 mV to +500 mV)
|
1 MΩ | ||
|
● -80 mV to +80 mV
|
Yes | Yes | |
|
— Input resistance (-80 mV to +80 mV)
|
1 MΩ |
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