General information
Product type designationSM 1231, AI 8x16 bit TC
based on6ES7231-5QF50-0XB0
Supply voltage
Rated value (DC)24 V
permissible range, lower limit (DC)20.4 V
permissible range, upper limit (DC)28.8 V
Input current
Current consumption, typ.15 mA
from backplane bus 5 V DC, typ.40 mA
Power loss
Power loss, typ.0.6 W
Analog inputs
Number of analog inputs8; Thermocouples
permissible input voltage for voltage input (destruction limit), max.±35 V
Technical unit for temperature measurement adjustableDegrees Celsius/degrees Fahrenheit
Input ranges
VoltageYes
CurrentNo
ThermocoupleYes; J, K, T, E, R & S, B, N, C, TXK/XK(L); voltage range: ±80 mV
Resistance thermometerNo
ResistanceNo
Input ranges (rated values), voltages
-80 mV to +80 mVYes
— Input resistance (-80 mV to +80 mV)>= 10 MOhm
Input ranges (rated values), thermocouples
Type BYes
Type CYes
Type EYes
Type JYes
Type KYes
Type NYes
Type RYes
Type SYes
Type TYes
Type TXK/TXK(L) to GOSTYes
Temperature compensation
— ParameterizableYes
Cable length
shielded, max.100 m; to the sensor
Analog value generation for the inputs
Measurement principleintegrating
Integration and conversion time/resolution per channel
Resolution with overrange (bit including sign), max.15 bit; + sign
Integration time, parameterizableYes
Interference voltage suppression for interference frequency f1 in Hz85 dB at 10 / 50 / 60 / 400 Hz
Smoothing of measured values
parameterizableYes
Step: NoneYes
Step: lowYes
Step: MediumYes
Step: HighYes
Errors/accuracies
cold connection point±1,5 °C
Temperature error (relative to input range), (+/-)25 °C ±0.05 % / -40 °C to 70 °C ±0.15 % of the full-scale deflection
Repeat accuracy in steady state at 25 °C (relative to input range), (+/-)0.05 %
Interference voltage suppression for f = n x (f1 +/- 1 %), f1 = interference frequency
Common mode interference, min.120 dB
Interrupts/diagnostics/status information
AlarmsYes
Diagnostics functionYes; Can be read out
Alarms
Diagnostic alarmYes
Diagnoses
Monitoring the supply voltageYes
Wire breakYes
Diagnostics indication LED
DIAG LEDYes
for status of the inputsYes
Potential separation analog inputs
between the channels and the power supply of the electronicsYes
Isolation
Isolation tested with707 V DC (type test)
tested with
Between channels120 V AC
Degree and class of protection
IP degree of protectionIP20
Free fall
Fall height, max.0.3 m; five times, in product package
Ambient temperature during operation
min.-20 °C
max.60 °C; at max. voltages and max. specifications
horizontal installation, min.-20 °C; incl. condensation / frost; -40 °C possible with voltage-type sensor
horizontal installation, max.70 °C; at rated voltages, 50 % of max. specification and alternate IO active
vertical installation, min.-20 °C; -40 °C possible with voltage-type sensor
vertical installation, max.50 °C; at max. voltages and max. specification
Ambient temperature during storage/transportation
min.-40 °C
max.70 °C
Air pressure acc. to IEC 60068-2-13
Operation, min.540 hPa
Operation, max.1 140 hPa
Storage/transport, min.540 hPa
Storage/transport, max.1 140 hPa
Altitude during operation relating to sea level
Installation altitude, min.-1 000 m
Installation altitude, max.5 000 m; Restrictions for installation altitudes > 2 000 m, see manual
Relative humidity
With condensation, tested in accordance with IEC 60068-2-38, max.100 %; RH incl. condensation / frost (no commissioning in bedewed state), horizontal installation
Vibrations
Vibration resistance during operation acc. to IEC 60068-2-63.5 mm from 5 - 8.4 Hz, 1g from 8.4 - 150 Hz
Operation, tested according to IEC 60068-2-6Yes
Shock testing
tested according to IEC 60068-2-27Yes; IEC 68, Part 2-27; half-sine, 15 g, 11 ms
Coolants and lubricants
— Resistant to commercially available coolants and lubricantsYes; Incl. diesel and oil droplets in the air
Use in stationary industrial systems
— to biologically active substances according to EN 60721-3-3Yes; Class 3B2 mold, fungus and dry rot spores (with the exception of fauna); Class 3B3 on request
— to chemically active substances according to EN 60721-3-3Yes; Class 3C4 (RH < 75%) incl. salt spray acc. to EN 60068-2-52 (severity degree 3)
— to mechanically active substances according to EN 60721-3-3Yes; Class 3S4 incl. sand, dust
Use on ships/at sea
— to biologically active substances according to EN 60721-3-6Yes; Class 6B2 mold, fungal and dry rot spores (excluding fauna)
— to chemically active substances according to EN 60721-3-6Yes; Class 6C3 (RH < 75%) incl. salt spray acc. to EN 60068-2-52 (severity degree 3).
— to mechanically active substances according to EN 60721-3-6Yes; Class 6S3 incl. sand, dust
Usage in industrial process technology
— Against chemically active substances acc. to EN 60654-4Yes; Class 3 (excluding trichlorethylene)
— Environmental conditions for process, measuring and control systems acc. to ANSI/ISA-71.04Yes; Level GX group A/B (excluding trichlorethylene; harmful gas concentrations up to the limits of EN 60721-3-3 class 3C4 permissible); level LC3 (salt spray) and level LB3 (oil)
Conformal coating
Coatings for printed circuit board assemblies acc. to EN 61086Yes; Class 2 for high reliability
Protection against fouling acc. to EN 60664-3Yes; Type 1 protection
Military testing according to MIL-I-46058C, Amendment 7Yes; Discoloration of coating possible during service life
Qualification and Performance of Electrical Insulating Compound for Printed Board Assemblies according to IPC-CC-830AYes; Conformal coating, Class A
Connection method
required front connectorYes
Mechanics/material
PlasticYes
Dimensions
Width30 mm
Height125 mm
Depth100 mm
Weights
Weight, approx.171 g