Manual

Publication 1756-UM009C-EN-P - December 2010 15

Chapter

What Are ControlLogix Analog I/O Modules?

Introduction

This chapter provides an overview of the ControlLogix analog I/O modules

to explain to you how they operate.

ControlLogix analog I/O modules are interface modules that convert analog

signals to digital values for inputs and convert digital values to analog signals

for outputs. Controllers can then use these signals for control purposes.

By using the producer/consumer network model, ControlLogix analog I/O

modules produce information when needed while providing additional system

functions.

The table lists several features available on ControlLogix analog I/O modules.

Topic Page

I/O Module in the ControlLogix System 17

Parts Illustration of the ControlLogix Analog I/O Module 18

Module Identification and Status Information 19

Preventing Electrostatic Discharge 20

ControlLogix Analog I/O Module Features

Feature Description

Removal and insertion

under power (RIUP)

You can remove and insert modules and removable terminal

blocks (RTB) while power is applied.

Producer/consumer

communication

This communication is an intelligent data exchange

between modules and other system devices in which each

module produces data without first being polled.

Rolling timestamp of data A 15-bit module-specific rolling timestamp with millisecond

resolution that indicates when data was sampled and/or

applied. This timestamp may be used to calculate the

interval between channel or field-side updates.

Multiple data formats Analog I/O modules offer the option of IEEE 32-bit floating

point or 16-bit integer data formats.

Module resolution Analog input modules use 16-bit resolution, and analog

output modules offer 13…16-bit output resolution

(depending on the module type), to detect data changes.

On-board features Scaling to engineering units, alarming, and under/overrange

detection, are some examples of the I/O module features.