Rockwell Automation Publication 1715-UM001J-EN-P - December 2020
257
Appendix
B
1715-IB16D Digital Input Module Diagnostics
Threshold Values for Digital
Inputs
This section describes how to calculate and set threshold values for digital
inputs.
The module determines the channel state and the line fault status by
comparing the channel input voltage with defined threshold values. Line
faults, such as short circuit and wire off, can be determined by using different
input voltage values.
With this module, you can define custom threshold values or use a set of preset
default values. The types of threshold values you choose initially for the module
become inherent in each channel; you can define different thresholds for
individual channels later.
The threshold values determine which end-of-line (EOL) resistor value you
choose, and vice versa, depending on whether you choose the threshold values
first, or the EOL resistor values first.
By considering these two components—EOL resistor values and the threshold
values, we can arrive at the diagnostic settings for the module.
Figure 74 - Common EOL Device Scenario
1
5
4
Term
As
R1
R2
45678
Содержание Allen-Bradley 1715-AENTR
Страница 10: ...10 Rockwell Automation Publication 1715 UM001J EN P December 2020 ...
Страница 114: ...114 Rockwell Automation Publication 1715 UM001J EN P December 2020 Chapter 2 Installation Instructions Notes ...
Страница 134: ...134 Rockwell Automation Publication 1715 UM001J EN P December 2020 Chapter 4 Digital I O Operation Notes ...
Страница 200: ...200 Rockwell Automation Publication 1715 UM001J EN P December 2020 Chapter 6 Configure the Redundant I O System Notes ...
Страница 244: ...244 Rockwell Automation Publication 1715 UM001J EN P December 2020 Chapter 9 Redundant I O System Diagnostics Notes ...
Страница 272: ...272 Rockwell Automation Publication 1715 UM001J EN P December 2020 Appendix C Reconfigure a Module Online Notes ...
Страница 290: ...290 Rockwell Automation Publication 1715 UM001J EN P December 2020 Appendix G History of Changes Notes ...
Страница 296: ...296 Rockwell Automation Publication 1715 UM001J EN P December 2020 ...
Страница 297: ...Rockwell Automation Publication 1715 UM001J EN P December 2020 297 Redundant I O System User Manual ...