Rockwell Automation 1771-IL/B , D17716.5.91 ISOLATED ANALOG INPUT Module - Manual (Page 9)

Chapter
1
1-1
Overview of the Input Module
This chapter gives you information on:
features of the module
how the input module communicates with programmable
controllers
The 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 that requires no external power
supply. 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.
This module senses up to eight analog signals at its inputs and converts
them to a proportional four-digit BCD or 16-bit binary value while
providing channel to channel and channel to ground isolation of +1000V.
You can select from five voltage or three current input ranges. Each input
is software selectable on a per channel basis.
This module’s features include:
Eight software configurable differential inputs
User program selectable input ranges on a per channel basis (see
Table 1.A)
Selectable real-time sampling
Selectable scaling to engineering units
Selectable digital filtering
+1000V input isolation, channel-to-channel, channel-to-ground
Selectable high and low input alarms
Chapter Objectives
Module Descriptions
Features