8
Chapter
8–1
Application Examples
This chapter provides two application examples to help you use the RTD
input module. They are defined as a:
•
basic example
•
supplementary example
The basic example builds on the configuration word programming provided
in chapter 6 to set up one channel for operation. This setup is then used in a
typical application to display temperature.
The supplementary example demonstrates how to perform a dynamic
configuration of all four channels. The example sets up an application that
allows you to manually select whether the displayed RTD input data for any
channel is expressed in
°
C or
°
F.
Use the worksheet in Figure 8.2.
Figure 8.1 indicates the temperature of a bath on an LED display. The
display requires binary coded decimal (BCD) data, so the program must
convert the temperature reading from the RTD module to BCD before
sending it to the display. This application displays the temperature in
°
F.
Figure 8.1
Device Configuration
1746–NR4
1746–OB16
Bath
LED Display
(DC Sinking Inputs, BCD Format)
SLC 5/04
200
Ω
Platinum RTD
Channel Configuration
Configure the RTD channel with the following setup:
•
200
Ω
Platinum RTD
•
°
F in whole degrees
•
zero data word in the event of an open or short circuit
•
10 Hz input filter
•
2.0 mA excitation current
Basic Example
Summary of Contents for SLC 500 1746-NR4
Page 1: ...User Manual SLC 500t RTD Resistance Input Module Cat No 1746 NR4 Allen Bradley AB Spares ...
Page 15: ...Preface P 8 Notes AB Spares ...
Page 37: ...Chapter 2 Quick Start 2 12 Notes AB Spares ...
Page 63: ...Chapter 4 Preliminary Operating Considerations 4 12 Notes AB Spares ...
Page 87: ...Chapter 5 Channel Configuration Data and Status 5 24 Notes AB Spares ...
Page 107: ...Chapter 7 Module Diagnostics and Troubleshooting 7 8 Notes AB Spares ...
Page 117: ...Chapter 8 Application Examples 8 10 Notes AB Spares ...
Page 123: ...Appendix A Specifications A 6 Notes AB Spares ...
Page 125: ...Appendix B RTD Standards B 2 Notes AB Spares ...
