ABB AC500 PLC - Accuracy of Thermocouple Ranges at 25 °C (with Cold Junction Compensation)

Parameter Value
Input type Floating thermocouple
Galvanic isolation Against internal power supply and other modules
Common mode rejection > 120 dB at 120 VAC
Indication of the input signals No
Module update time All channels: < 1.6 s
Channel input resistance On request
Input filter attenuation -3 dB at 15 kHz
Cold junction error ±1.5 °C
Conversion error of the analog values
caused by non-linearity, adjustment
error at factory and resolution within
the normal range
Typ. 0.1 % of full-scale (voltage)
Depending on thermocouple, see table
Ä Chapter 1.5.2.1.3.9.1.1 “Accuracy of Ther-
mocouple Ranges at 25 °C (with Cold Junc-
tion Compensation)” on page 426
at 25 °C
Max. ±2 % of full scale (T-Type: ±3 % for -240
°C...-270 °C)
at 0 °C...60 °C
Relationship between input signal
and hex code
Ä Chapter 1.5.2.1.3.8 “Measuring Ranges”
on page 423
Analog to digital conversion time 400 ms per channel
Unused inputs Can be left open and should be configured as "unused"
Input data length 8 bytes
Overvoltage protection Yes, up to 30 VDC
Repeatability On request
Wire loop resistance < 100 W
Max. cable length (conductor cross
section > 0.14 mm²)
Unshielded wire 10 m
Shielded wire 100 m
Accuracy of Thermocouple Ranges at 25 °C (with Cold Junction Compensation)
Thermocouple Type Range Accuracy
E -270 °C...-220 °C
-220 °C...+1000 °C
±2 %
±0.6 %
J -210 °C...+1200 °C ±0.6 %
K -270 °C...-220 °C
-220 °C...+1372 °C
±1.5 %
±0.6 %
N -270 °C...-150 °C
-150 °C...+1300 °C
±2 %
±0.6 %
R -50 °C...+150 °C
+150 °C...+1768 °C
±1.5 %
±0.6 %
Device Specifications
I/O Modules > Analog I/O Modules
2019/04/173ADR010121, 13, en_US426