Allen Bradley 1771-IFE Analog Input Module

1771-IFE Compatibility

The 1771-IFE series C module can be used with any 1771 I/O chassis.

Communication between the discrete analog module and the processor is bidirectional; the processor block-transfers output data through the output image table to the module and block-transfers input data from the module through the input image table.

The module also requires an area in the data table to store the read block transfer data and write block transfer data.

I/O image table use is an important factor in module placement and addressing selection.

Compatibility and data table use is listed below.

You can place your input module in any I/O module slot of the I/O chassis.

You can put two input modules in the same module group.

You can put input and an output module in the same module group.

Do not put the module in the same module group as a discrete high-density module.

Avoid placing analog input modules close to ac modules or high voltage dc modules.

Do not use this module with a cat. no. 1771-AL PLC-2/20, 2/30 Local Adapter.

Related Publications

For a list of publications with information on Allen-Bradley programmable controller products, consult our publication index (SD499)

Overview of The Analog Input 1771-IFE Module

Chapter Objectives

This chapter, we describe:

• features of the module

• how the module communicates with programmable controllers

1771-IFE Module Description

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.

1771-IFE Features

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

Important of 1771-IFE

The 1771-IFE module is shipped from the factory set for voltage mode and Series C applications.

Refer to “Setting the Configuration Plugs on the Module” on page 2–3 for other combinations of current and voltage inputs and “Setting the Series A/B Simulation

Power Requirements

Your module receives its power through 1771 I/O power supply.

The module requires 500mA from the backplane.

Add this current to the requirements of all other modules in the I/O chassis to prevent overloading the chassis backplane and/or backplane power supply.

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