| SIMATIC S7-300, Analog input SM 331, isolated, 8 AI thermocouples Type B, E, J, K, L, N, R, S, T TXK/TXK (L) according to GOST 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. | 240 mA |
from backplane bus 5 V DC, max. | 100 mA |
Power loss |
Power loss, typ. | 3 W |
Analog inputs |
Number of analog inputs | 8 |
permissible input voltage for voltage input (destruction limit), max. | 75 V; 20 V DC permanent, 75 V DC for max. 1 s (duty factor 1:20) |
Input ranges |
● Voltage | No |
● 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 | No |
● -10 V to +10 V | No |
● -2.5 V to +2.5 V | No |
● -250 mV to +250 mV | No |
● -5 V to +5 V | No |
● -50 mV to +50 mV | No |
● -500 mV to +500 mV | No |
● -80 mV to +80 mV | No |
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 |
● Type C | Yes |
● Type E | Yes |
● Type J | Yes |
● Type K | Yes |
● Type L | Yes |
● Type N | Yes |
● Type R | Yes |
● Type S | Yes |
● Type T | Yes |
● Type U | Yes |
● Type TXK/TXK(L) to GOST | Yes |
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. | 100 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) | Up to 4 channels: 10 ms per module, 5 channels upwards: 190 ms per module |
● Interference voltage suppression for interference frequency f1 in Hz | 400 / 60 / 50 Hz |
Errors/accuracies |
Operational error limit in overall temperature range |
● Voltage, relative to input range, (+/-) | ±1 K |
● Thermocouple, relative to input range, (+/-) | Type T: ±0.18%, Type U: ±0.15%, Type E: ±0.12%, Type J: ±0.12%, Type L: ±0.17%, Type K: ±0.15%, Type N: ±0.17%, Type R: ±0.08%, Type S: ±0.10%, Type B: ±0.13%, Type C: ±0.10%, TXK/XK(L): ±1.00% accuracy in the lower range of the characteristic curve |
Basic error limit (operational limit at 25 °C) |
● Thermocouple, relative to input range, (+/-) | Type T: ±0.13%, Type U: ±0.08%, Type E: ±0.05%, Type J: ±0.04%, Type L: ±0.06%, Type K: ±0.04%, Type N: ±0.04%, Type R: ±0.03%, Type S: ±0.03%, Type B: ±0.05%, Type C: ±0.02%, TXK/XK(L): ±0.67 % accuracy in the lower range of the characteristic curve |
Interrupts/diagnostics/status information |
Diagnostics function | Yes; Parameterizable |
Alarms |
● Diagnostic alarm | Yes; Parameterizable per group |
● Limit value alarm | Yes; Parameterizable |
● Hardware interrupt | Yes; Parameterizable, channels 0 to 7 |
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 | 2 |
● between the channels and backplane bus | Yes |
● between the channels and the power supply of the electronics | Yes |
Isolation |
Isolation tested with | 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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