Rockwell Automation 1756-XXXX ControlLogix Analog I/O Modules - Manual (Page 15)

Publication 1756-UM009C-EN-P - December 2010 15
Chapter
1
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.