| SIMATIC S7-300, Analog input SM 331, isolated, 2 AI, Resolution 9/12/14 bits, U/I/thermocouple/resistor, alarm, diagnostics, 1x 20-pole, Removing/inserting with active backplane bus |
Supply voltage |
Load voltage L+ |
● Rated value (DC) | 24 V |
● Reverse polarity protection | Yes |
Input current |
from load voltage L+ (without load), max. | 30 mA |
from backplane bus 5 V DC, max. | 50 mA |
Power loss |
Power loss, typ. | 1 W |
Analog inputs |
Number of analog inputs | 2 |
● For resistance measurement | 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) |
permissible input current for current input (destruction limit), max. | 40 mA |
Input ranges |
● Voltage | Yes |
● Current | Yes |
● Thermocouple | Yes |
● Resistance thermometer | Yes |
● Resistance | Yes |
Input ranges (rated values), voltages |
● 0 to +10 V | No |
● 1 V to 5 V | Yes |
— Input resistance (1 V to 5 V) | 100 kΩ |
● 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 | Yes |
— Input resistance (-10 V to +10 V) | 100 kΩ |
● -2.5 V to +2.5 V | Yes |
— Input resistance (-2.5 V to +2.5 V) | 100 kΩ |
● -250 mV to +250 mV | Yes |
— Input resistance (-250 mV to +250 mV) | 10 MΩ |
● -5 V to +5 V | Yes |
— Input resistance (-5 V to +5 V) | 100 kΩ |
● -50 mV to +50 mV | No |
● -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 | Yes |
— Input resistance (0 to 20 mA) | 25 Ω |
● -10 mA to +10 mA | Yes |
— Input resistance (-10 mA to +10 mA) | 25 Ω |
● -20 mA to +20 mA | Yes |
— Input resistance (-20 mA to +20 mA) | 25 Ω |
● -3.2 mA to +3.2 mA | Yes |
— Input resistance (-3.2 mA to +3.2 mA) | 25 Ω |
● 4 mA to 20 mA | Yes |
— Input resistance (4 mA to 20 mA) | 25 Ω |
Input ranges (rated values), thermocouples |
● Type B | No |
● 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 | No |
● Type N | Yes |
— Input resistance (Type N) | 10 MΩ |
● Type R | No |
● Type S | No |
● Type T | No |
● Type U | No |
● Type TXK/TXK(L) to GOST | No |
Input ranges (rated values), resistance thermometer |
● Cu 10 | No |
● Ni 100 | Yes |
— Input resistance (Ni 100) | 10 MΩ; Standard |
● Ni 1000 | No |
● LG-Ni 1000 | No |
● Ni 120 | No |
● Ni 200 | No |
● Ni 500 | No |
● Pt 100 | Yes |
— Input resistance (Pt 100) | 10 kΩ; Standard |
● Pt 1000 | No |
● Pt 200 | No |
● Pt 500 | No |
Input ranges (rated values), resistors |
● 0 to 150 ohms | Yes |
— Input resistance (0 to 150 ohms) | 10 MΩ |
● 0 to 300 ohms | Yes |
— Input resistance (0 to 300 ohms) | 10 MΩ |
● 0 to 600 ohms | Yes |
— Input resistance (0 to 600 ohms) | 10 MΩ |
● 0 to 6000 ohms | No |
Thermocouple (TC) |
Temperature compensation |
— parameterizable | Yes |
— internal temperature compensation | Yes |
— external temperature compensation with compensations socket | Yes |
— for definable comparison point temperature | Yes |
Characteristic linearization |
● parameterizable | Yes |
Cable length |
● shielded, max. | 200 m; 50 m at 80 mV and thermocouples |
Analog value generation for the inputs |
Integration and conversion time/resolution per channel |
● Resolution with overrange (bit including sign), max. | 15 bit; Unipolar: 9/12/12/14 bit; bipolar: 9 bit + sign/12 bit + sign/12 bit + sign/14 bit + sign |
● Integration time, parameterizable | Yes; 2,5 / 16,67 / 20 / 100 ms |
● Basic conversion time (ms) | 3 / 17 / 22 / 102 ms |
● Interference voltage suppression for interference frequency f1 in Hz | 400 / 60 / 50 / 10 Hz |
Encoder |
Connection of signal encoders |
● for voltage measurement | Yes |
● for current measurement as 2-wire transducer | Yes |
● for current measurement as 4-wire transducer | Yes |
● for resistance measurement with two-wire connection | Yes |
● for resistance measurement with three-wire connection | Yes |
● for resistance measurement with four-wire connection | Yes |
Errors/accuracies |
Operational error limit in overall temperature range |
● Voltage, relative to input range, (+/-) | 1 %; ±1% (80 mV); ±0.6% (250 mV to 1 000 mV); ±0.8% (2.5 V to 10 V) |
● Current, relative to input range, (+/-) | 0.7 %; From 3.2 to 20 mA |
● Resistance, relative to input range, (+/-) | 0.7 %; 150, 300, 600 Ohm |
● Resistance thermometer, relative to input range, (+/-) | 0.7 %; ±0.7 % (Pt100/ Ni100); ±0.8 % (Pt100 climate) |
● Thermocouple, relative to input range, (+/-) | 1.1 %; Type E, J, K, L, N |
Basic error limit (operational limit at 25 °C) |
● Voltage, relative to input range, (+/-) | 0.6 %; ±0.6% (80 mV, 2.5 V to 10 V); ±0.4% (250 mV to 1 000 mV) |
● Current, relative to input range, (+/-) | 0.5 %; 3.2 to 20 mA |
● Resistance, relative to input range, (+/-) | 0.5 %; 150, 300, 600 Ohm |
● Resistance thermometer, relative to input range, (+/-) | 0.6 %; ±0.5% (Pt100/ Ni100), ±0.6% (Pt100 climate) |
● Thermocouple, relative to input range, (+/-) | 0.7 %; Type E, N, J, K, L |
Interrupts/diagnostics/status information |
Diagnostics function | Yes; Parameterizable |
Alarms |
● Diagnostic alarm | Yes |
● Limit value alarm | Yes; Parameterizable, channel 0 |
Diagnostic messages |
● Diagnostic information readable | Yes |
Diagnostics indication LED |
● Group error SF (red) | Yes |
Potential separation |
Potential separation analog inputs |
● between the channels | No |
● between the channels and backplane bus | Yes |
● between the channels and the power supply of the electronics | Yes; Not for 2-wire transmitters |
Isolation |
Isolation tested with | 500 V DC |
Connection method |
required front connector | 20-pin |
Dimensions |
Width | 40 mm |
Height | 125 mm |
Depth | 120 mm |
Weights |
Weight, approx. | 250 g |
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