| SIMATIC S7, analog input SM 331, isolated, 8 AI thermocouples/4 AI Pt100, for signals from the hazardous area, diagnostics-capable, PTB tested 1 x 20-pole |
Supply voltage |
Load voltage L+ |
● Rated value (DC) | 24 V |
Input current |
from backplane bus 5 V DC, max. | 120 mA |
Power loss |
Power loss, typ. | 0.6 W |
Analog inputs |
Number of analog inputs | 8; 8x thermocouples; 4x RTD thermoresistors |
Input ranges |
● Voltage | Yes |
● Current | No |
● Thermocouple | Yes |
● Resistance thermometer | Yes |
● Resistance | Yes |
Input ranges (rated values), voltages |
● -1 V to +1 V | Yes |
— Input resistance (-1 V to +1 V) | 10 MΩ |
● -25 mV to +25 mV | Yes |
— Input resistance (-25 mV to +25 mV) | 10 MΩ |
● -250 mV to +250 mV | Yes |
— Input resistance (-250 mV to +250 mV) | 10 MΩ |
● -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), thermocouples |
● Type B | Yes |
— Input resistance (Type B) | 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 |
Input ranges (rated values), resistance thermometer |
● Ni 100 | Yes |
— Input resistance (Ni 100) | 10 MΩ |
● Pt 100 | Yes |
— Input resistance (Pt 100) | 10 MΩ |
● Pt 200 | Yes |
— Input resistance (Pt 200) | 10 MΩ |
Cable length |
● shielded, max. | 200 m; TC: 50 m |
Analog value generation for the inputs |
Integration and conversion time/resolution per channel |
● Resolution with overrange (bit including sign), max. | 16 bit; 10 bit to 15 bit + sign |
● Integration time, parameterizable | Yes; 2.5 to 100 ms |
● Interference voltage suppression for interference frequency f1 in Hz | 10 to 400 Hz |
Encoder |
Connection of signal encoders |
● for current measurement as 2-wire transducer | Yes |
● for current measurement as 4-wire transducer | Yes |
Errors/accuracies |
Operational error limit in overall temperature range |
● Resistance thermometer, relative to input range, (+/-) | 0.04 %; 0.09 to 0.04% |
Basic error limit (operational limit at 25 °C) |
● Resistance thermometer, relative to input range, (+/-) | 0.008 %; 0.018 … 0.008% |
Interrupts/diagnostics/status information |
Diagnostics function | Yes |
Diagnostic messages |
● Diagnostic information readable | Yes |
● Overrange | Yes |
● Wire-break in signal transmitter cable | Yes |
● Short-circuit of the signal encoder cable | Yes |
Diagnostics indication LED |
● Group error SF (red) | Yes |
● Channel fault indicator F (red) | Yes |
Ex(i) characteristics |
Module for Ex(i) protection | Yes |
Maximum values of input circuits (per channel) |
● Co (permissible external capacity), max. | 43 µF |
● Io (short-circuit current), max. | 28.8 mA |
● Lo (permissible external inductivity), max. | 40 mH |
● Po (power of load), max. | 41.4 mW |
● Uo (output no-load voltage), max. | 5.9 V |
Potential separation |
Potential separation analog inputs |
● between the channels | No |
● between the channels and backplane bus | Yes |
Standards, approvals, certificates |
Use in hazardous areas |
● Type of protection acc. to EN 50020 (CENELEC) | [EEx ib] IIC |
● Type of protection acc. to FM | Class I, Division 2, Group A, B, C, D T4 |
● Test number PTB | Ex-96.D.2108X |
Ambient conditions |
Ambient temperature during operation |
● max. | 60 °C |
Connection method |
required front connector | 20-pin |
Weights |
Weight, approx. | 210 g |
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