Rockwell Automation 1746-NT8 SLC 500 Thermocouple/mV Analog Input Module/ Instructions - Manual (Page 3)

SLC 500 Thermocouple/mV Analog Input Module 3
Publication 1746-IN015C-EN-P - July 2001
Module Overview
The module communicates with the SLC 500 processor and receives +5V dc and
+24V dc power from the system power supply through the parallel backplane
interface. No external power supply is required. You may install as many
thermocouple modules in the system as the power supply can support.
Each module channel can receive input signals from a thermocouple or a millivolt
analog input device. You configure each channel to accept either one. The module
converts analog input voltages when it is configured for thermocouple input types.
The analog input voltages are converted into cold-junction compensated, digital
temperature readings. The module uses the National Institute of Standards and
Technology (NIST) based on ITS-90 for thermocouple linearization.
When configured for millivolt analog inputs, the module converts analog values
directly into digital counts. The module assumes that the mV input signal is linear
prior to input to the module.
Input Ranges
The following two tables define thermocouple types and associated temperature
ranges and the millivolt analog input signal ranges that each of the module’s input
channels will support. To determine the practical temperature range of your
thermocouple, refer to the specifications in Appendix A of the SLC 500
Thermocouple/mV Analog Input Module User Manual, publication 1746-6.22.
Table A Thermocouple Temperature Ranges
Type °C Temperature Range °F Temperature Range
J -210 °C to 760 °C -346 °F to 1400 °F
K -270 °C to 1370 °C -454 °F to 2498 °F
T -270 °C to 400 °C -454 °F to 752 °F
B 300 °C to 1820 °C 572 °C to 3308 °F
E -270 °C to 1000 °C -454 °F to 1832 °F
R 0 °C to 1768 °C 32 °F to 3214 °F
S 0 °C to 1768 °C 32 °F to 3214 °F
N 0 °C to 1300 °C 32 °F to 2372 °F
CJC Sensor -25 °C to 105 °C -13 °F to 221 °F
Table B Millivolt Input Ranges
(1)
(1) Output impedance of input device must be less than 100 Ω to meet accuracy specifications.
-50 to +50 mV -100 to +100 mV