| SIMATIC S7-300, Analog input SM 331, single channel Isolated 250 V AC, 6 AI thermocouples Type B, E, J, K, L, N, R, S, T Voltage: +/-25MV to +/-1V 16 bit, 50ms, 1x 40-pole |
| Supply voltage |
| Load voltage L+ |
| ● Rated value (DC) | 24 V |
| ● Reverse polarity protection | Yes |
| Input current |
| from load voltage L+ (without load), max. | 150 mA |
| from backplane bus 5 V DC, max. | 100 mA |
| Power loss |
| Power loss, typ. | 2.2 W |
| Analog inputs |
| Number of analog inputs | 6 |
| permissible input voltage for voltage input (destruction limit), max. | 35 V; 35 V continuous, 75 V for max. 1 s (mark to space ratio 1:20) |
| Input ranges |
| ● Voltage | Yes |
| ● Current | No |
| ● Thermocouple | Yes |
| ● Resistance thermometer | No |
| ● Resistance | No |
| Input ranges (rated values), voltages |
| ● 0 to +10 V | No |
| ● 1 V to 5 V | No |
| ● 1 V to 10 V | No |
| ● -1 V to +1 V | Yes |
| — Input resistance (-1 V to +1 V) | 10 MΩ |
| ● -10 V to +10 V | No |
| ● -2.5 V to +2.5 V | No |
| ● -250 mV to +250 mV | Yes |
| — Input resistance (-250 mV to +250 mV) | 10 MΩ |
| ● -5 V to +5 V | No |
| ● -50 mV to +50 mV | Yes |
| — Input resistance (-50 mV to +50 mV) | 10 MΩ |
| ● -500 mV to +500 mV | Yes |
| — Input resistance (-500 mV to +500 mV) | 10 MΩ |
| ● -80 mV to +80 mV | Yes |
| — Input resistance (-80 mV to +80 mV) | 10 MΩ |
| Input ranges (rated values), currents |
| ● 0 to 20 mA | No |
| ● -10 mA to +10 mA | No |
| ● -20 mA to +20 mA | No |
| ● -3.2 mA to +3.2 mA | No |
| ● 4 mA to 20 mA | No |
| Input ranges (rated values), thermocouples |
| ● Type B | Yes |
| — Input resistance (Type B) | 10 MΩ |
| ● Type C | Yes |
| — Input resistance (Type C) | 10 MΩ |
| ● Type E | Yes |
| — Input resistance (Type E) | 10 MΩ |
| ● Type J | Yes |
| — Input resistance (type J) | 10 MΩ |
| ● Type K | Yes |
| — Input resistance (Type K) | 10 MΩ |
| ● Type L | Yes |
| — Input resistance (Type L) | 10 MΩ |
| ● Type N | Yes |
| — Input resistance (Type N) | 10 MΩ |
| ● Type R | Yes |
| — Input resistance (Type R) | 10 MΩ |
| ● Type S | Yes |
| — Input resistance (Type S) | 10 MΩ |
| ● Type T | Yes |
| — Input resistance (Type T) | 10 MΩ |
| ● Type U | Yes |
| — Input resistance (Type U) | 10 MΩ |
| ● Type TXK/TXK(L) to GOST | Yes |
| — Input resistance (Type TXK/TXK(L) to GOST) | 10 MΩ |
| Input ranges (rated values), resistance thermometer |
| ● Cu 10 | No |
| ● Ni 100 | No |
| ● Ni 1000 | No |
| ● LG-Ni 1000 | No |
| ● Ni 120 | No |
| ● Ni 200 | No |
| ● Ni 500 | No |
| ● Pt 100 | No |
| ● Pt 1000 | No |
| ● Pt 200 | No |
| ● Pt 500 | No |
| Input ranges (rated values), resistors |
| ● 0 to 150 ohms | No |
| ● 0 to 300 ohms | No |
| ● 0 to 600 ohms | No |
| ● 0 to 6000 ohms | No |
| Thermocouple (TC) |
| Temperature compensation |
| — parameterizable | Yes |
| — internal temperature compensation | Yes |
| — external temperature compensation with Pt100 | Yes |
| — external temperature compensation with compensations socket | Yes |
| — for definable comparison point temperature | Yes |
| Characteristic linearization |
| ● parameterizable | 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. | 16 bit; Two’s complement |
| ● Integration time, parameterizable | Yes |
| ● Basic conversion time (ms) | 30 / 50 / 60 / 300 ms |
| ● Integration time (ms) | 10/ 16.67/ 20/ 100 ms |
| ● Interference voltage suppression for interference frequency f1 in Hz | 10 / 50 / 60 / 400 Hz |
| Encoder |
| Connection of signal encoders |
| ● for voltage measurement | Yes |
| Errors/accuracies |
| Operational error limit in overall temperature range |
| ● Voltage, relative to input range, (+/-) | Operating error at 0 … 60 °C: ±0.12% @ ±25 mV, ±0.08% @ ±50 mV, ±0.6% @ ±80 mV, ±0.05% @ ±250 mV, ±0.05% @ 500 mV, ±0.05% @ ±1 V |
| ● Thermocouple, relative to input range, (+/-) | See manual for details |
| Basic error limit (operational limit at 25 °C) |
| ● Voltage, relative to input range, (+/-) | See manual for details |
| ● Thermocouple, relative to input range, (+/-) | See manual for details |
| Interrupts/diagnostics/status information |
| Diagnostics function | Yes; Parameterizable |
| Alarms |
| ● Diagnostic alarm | Yes; channel by channel |
| ● Limit value alarm | Yes; Parameterizable |
| ● Hardware interrupt | Yes; Parameterizable |
| Diagnostic messages |
| ● Diagnostic information readable | Yes |
| Diagnostics indication LED |
| ● Group error SF (red) | Yes |
| Potential separation |
| Potential separation analog inputs |
| ● between the channels | Yes |
| ● between the channels, in groups of | 1 |
| ● between the channels and backplane bus | Yes |
| ● between the channels and the power supply of the electronics | Yes |
| Isolation |
| Isolation tested with | 2 500 V DC |
| Connection method |
| required front connector | 40-pin |
| Dimensions |
| Width | 40 mm |
| Height | 125 mm |
| Depth | 120 mm |
| Weights |
| Weight, approx. | 272 g |
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