Rockwell Automation 1771-IFE ANALOG INPUT MODULE - Manual (Page 10)

Chapter
1
Publication 1771Ć6.5.115 - February 1999
Overview of the Analog
Input Module
This chapter, we describe:
•
features of the module
•
how the module communicates with programmable controllers
The Analog input module is an intelligent block transfer module that
interfaces analog input signals with any Allen-Bradley
programmable controllers that have block transfer capability. Block
transfer programming moves input data words from the module’s
memory to a designated area in the processor data table in a single
scan. It also moves configuration words from the processor data
table to module memory.
The input module is a single-slot module and requires no external
power supply. (If using passive transducers for input, the user must
supply loop power.) After scanning the analog inputs, the input data
is converted to a specified data type in a digital format to be
transferred to the processor’s data table on request. The block
transfer mode is disabled until this input scan is complete.
Consequently, the minimum interval between block transfer reads is
the same as the total input update time for each analog input module.
The Analog input module senses up to 16 single-ended or 8
differential analog inputs and converts them to a proportional
four-digit BCD or twelve-bit binary value. You can select from five
voltage or three current input ranges. Each input can be configured
as a current or voltage input with internal jumpers.
This module’s program selectable features include:
•
16 single-ended or 8 differential inputs
•
User program selectable input ranges on a per channel basis (see
table)
•
Selectable real-time sampling
•
Selectable scaling to engineering units
•
Selectable digital filtering
•
Selectable data format
Chapter Objectives
Module Description
Features