| SIMATIC S7-300, Analog input SM 331, isolated, 8 AI; +/-5/10V, 1-5 V, +/-20 mA, 0/4 to 20 mA, 16 bit, Single rooting (60 V COM.), 4-channel operation: 10 ms, 8-channel operation: 23-95ms, 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. | 200 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; 35 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 | No |
● Resistance thermometer | No |
● Resistance | No |
Input ranges (rated values), voltages |
● 0 to +10 V | No |
● 1 V to 5 V | Yes |
— Input resistance (1 V to 5 V) | 10 MΩ |
● 1 V to 10 V | No |
● -1 V to +1 V | No |
● -10 V to +10 V | Yes |
— Input resistance (-10 V to +10 V) | 10 MΩ |
● -2.5 V to +2.5 V | No |
● -250 mV to +250 mV | No |
● -5 V to +5 V | Yes |
— Input resistance (-5 V to +5 V) | 10 MΩ |
● -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 | Yes |
— Input resistance (0 to 20 mA) | 250 Ω |
● -10 mA to +10 mA | No |
● -20 mA to +20 mA | Yes |
— Input resistance (-20 mA to +20 mA) | 250 Ω |
● -3.2 mA to +3.2 mA | No |
● 4 mA to 20 mA | Yes |
— Input resistance (4 mA to 20 mA) | 250 Ω |
Input ranges (rated values), thermocouples |
● Type B | No |
● Type C | No |
● Type E | No |
● Type J | No |
● Type K | No |
● Type L | No |
● Type N | No |
● 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 | 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 |
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; Unipolar: 15/15/15/15 bit; bipolar: 15 bit + sign/15 bit + sign/15 bit + sign/15 bit + sign |
● Integration time, parameterizable | Yes; 23 / 72 / 83 / 95 ms |
● Basic conversion time (ms) | 10 ms (4-channel mode); 95/83/72/23 ms (8-channel mode) |
● Interference voltage suppression for interference frequency f1 in Hz | 400 / 60 / 50 Hz, combinations of 400, 60, 50 Hz |
Encoder |
Connection of signal encoders |
● for voltage measurement | Yes |
● for current measurement as 2-wire transducer | Yes; with external transmitter, current supply; possible with separate supply for transmitter |
● for current measurement as 4-wire transducer | Yes |
Errors/accuracies |
Operational error limit in overall temperature range |
● Voltage, relative to input range, (+/-) | 0.1 % |
● Current, relative to input range, (+/-) | 0.1 % |
Basic error limit (operational limit at 25 °C) |
● Voltage, relative to input range, (+/-) | 0.05 % |
● Current, relative to input range, (+/-) | 0.05 % |
Interrupts/diagnostics/status information |
Diagnostics function | Yes; Parameterizable |
Alarms |
● Diagnostic alarm | Yes; Parameterizable |
● Limit value alarm | Yes; Parameterizable all channels (end of cycle interrupt is also supported across modules) |
● Hardware interrupt | Yes; Parameterizable, channels 0 to 7 (on exceeding limit value), at end of cycle |
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 AC |
Connection method |
required front connector | 40-pin |
Dimensions |
Width | 40 mm |
Height | 125 mm |
Depth | 117 mm |
Weights |
Weight, approx. | 272 g |
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