Allen-Bradley 1794-IF4I - Chapter 1 Overview of FLEX IO and your Analog Modules

11 Publication 1794-6.5.8 - January 2010
Chapter 1
Overview of FLEX I/O and your Analog
Modules
Chapter Objectives
In this chapter, we tell you about:
• what the FLEX I/O system is and what it contains
• types of FLEX I/O analog modules
• how FLEX I/O analog modules communicate with
programmable controllers
• the features of your analog modules
The FLEX I/O System
FLEX I/O is a small, modular I/O system for distributed applications
that performs all of the functions of rack-based I/O. The FLEX I/O
system contains the following components shown in Figure 1.1:
Figure 1.1
• adapter/power supply – powers the internal logic for as many as
eight I/O modules
• terminal base – contains a terminal strip to terminate wiring for
two- or three-wire devices
• I/O module – contains the bus interface and circuitry needed to
perform specific functions related to your application
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Adapter Terminal Base I/O Module