Rockwell Automation Publication 1794-UM061B-EN-P - March 2020
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Chapter
1
1794 FLEX I/O Diagnostic Digital Modules
Overview
Introduction
In this chapter, you will learn about the diagnostic input module, cat. no.
1794-IB16D, and the diagnostic output module, cat. no. 1794-OB16D.
General Description
This chapter contains an overview of the FLEX™ I/O diagnostic digital modules,
the 1794-IB16D input module and 1794-OB16D output module. You can use
the FLEX I/O diagnostic modules to help diagnose problems with input and
output field devices, I/O wiring and the user power supply. Additionally, these
modules can reduce installation startup time and help minimize time to find and
fix failures.
This chapter explains how to use the FLEX I/O diagnostic modules to help
detect the following types of faults:
• Open input or output field devices
• Open input or output wiring
• Shorted output field devices
• Shorted input or output wiring
• Reversed polarity of user supply wiring
• Open user supply wiring or failed user supply (using one diagnostic input
channel)
Topic
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