Article number 6ES7331-7PF11-0AB0
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)
Constant measurement current for resistance-type transmitter, typ. 0.7 mA
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
— for thermocouples Type B, E, J, K, L, N, R, S. T, U, C
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
Diagnoses
● 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
last modified: 3/12/2024