| Article number | 6ES7331-7KF02-0AB0 | 6ES7331-7HF01-0AB0 | 6ES7331-1KF02-0AB0 | 6ES7331-7KB02-0AB0 |
| SM331, 8AI, 9/12/14Bit | SM331, 8AI, 14BIT, 0,052MS/channel | SM331, 8AI, 13bit | SM331, 2AI, 9/12/14Bit |
| Supply voltage |
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| Load voltage L+ |
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● Rated value (DC) | 24 V | 24 V |
| 24 V |
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● Reverse polarity protection | Yes | Yes |
| Yes |
| Input current |
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| from load voltage L+ (without load), max. | 30 mA | 50 mA |
| 30 mA |
| from backplane bus 5 V DC, max. | 50 mA | 100 mA | 90 mA | 50 mA |
| Power loss |
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| Power loss, typ. | 1 W | 1.5 W | 0.4 W | 1 W |
| Analog inputs |
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| Number of analog inputs | 8 | 8 | 8 | 2 |
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● For resistance measurement | 4 |
| 8 | 1 |
| permissible input voltage for voltage input (destruction limit), max. | 20 V; continuous; 75 V for max. 1 s (mark to space ratio 1:20) | 20 V; 20 V DC permanent, 75 V DC for max. 1 s (duty factor 1:20) | 30 V; 12 V continuous, 30 V for max. 1 s | 20 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 | 40 mA | 40 mA | 40 mA |
| Constant measurement current for resistance-type transmitter, typ. | 1.67 mA |
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| 1.67 mA |
| Input ranges |
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● Voltage | Yes | Yes | Yes | Yes |
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● Current | Yes | Yes | Yes | Yes |
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● Thermocouple | Yes | No | No | Yes |
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● Resistance thermometer | Yes | No | Yes | Yes |
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● Resistance | Yes | No | Yes | Yes |
| Input ranges (rated values), voltages |
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● 0 to +10 V | No | No | Yes | No |
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— Input resistance (0 to 10 V) |
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| 100 kΩ |
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● 1 V to 5 V | Yes | Yes | Yes | Yes |
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— Input resistance (1 V to 5 V) | 100 kΩ | 100 kΩ | 100 kΩ | 100 kΩ |
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● 1 V to 10 V | No |
| No | No |
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● -1 V to +1 V | Yes | Yes | Yes | Yes |
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— Input resistance (-1 V to +1 V) | 10 MΩ | 10 MΩ | 100 kΩ | 10 MΩ |
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● -10 V to +10 V | Yes | Yes | Yes | Yes |
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— Input resistance (-10 V to +10 V) | 100 kΩ | 100 kΩ | 100 kΩ | 100 kΩ |
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● -2.5 V to +2.5 V | Yes |
| No | Yes |
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— Input resistance (-2.5 V to +2.5 V) | 100 kΩ |
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| 100 kΩ |
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● -250 mV to +250 mV | Yes |
| No | Yes |
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— Input resistance (-250 mV to +250 mV) | 10 MΩ |
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| 10 MΩ |
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● -5 V to +5 V | Yes | Yes | Yes | Yes |
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— Input resistance (-5 V to +5 V) | 100 kΩ | 100 kΩ | 100 kΩ | 100 kΩ |
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● -50 mV to +50 mV | No |
| Yes | No |
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— Input resistance (-50 mV to +50 mV) |
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| 100 kΩ |
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● -500 mV to +500 mV | Yes | Yes | Yes | Yes |
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— Input resistance (-500 mV to +500 mV) | 10 MΩ |
| 100 kΩ | 10 MΩ |
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● -80 mV to +80 mV | Yes | Yes | No | Yes |
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— Input resistance (-80 mV to +80 mV) | 10 MΩ |
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| 10 MΩ |
