General information
Product type designationSM 1231, AI 8x16 bit TC
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 % / -20 °C to 60 °C ±0.1 % of the full-scale range
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
Standards, approvals, certificates
CE markYes
CSA approvalNo
UL approvalYes
cULusYes
FM approvalNo
RCM (formerly C-TICK)Yes
KC approvalYes
Marine approvalNo
Free fall
Fall height, max.0.3 m; five times, in product package
Ambient temperature during operation
horizontal installation, min.-20 °C
horizontal installation, max.60 °C; at max. voltages and max. specification
vertical installation, min.-20 °C
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
Operation, max.95 %; no condensation
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
Pollutant concentrations
SO2 at RH < 60% without condensationS02: < 0.5 ppm; H2S: < 0.1 ppm; RH < 60 % condensation-free
Connection method
required front connectorYes
Mechanics/material
PlasticYes
Dimensions
Width30 mm
Height125 mm
Depth100 mm
Weights
Weight, approx.171 g