Allen-Bradley 1771 I/O Modules – 1771-IFE/B

Name: Allen-Bradley 1771 I/O Modules – 1771-IFE/B
Brand: Allen-Bradley

Model: 1771-IFE/B

Brand Allen-Bradley

Series 1771-IFE/B

Model 1771-IFE/B

RFQ-ready model route Obsolete and surplus sourcing Export follow-up by model list

Product Overview

Commercial availability is handled through direct RFQ, model verification and export-oriented follow-up rather than public cart checkout.

Submit RFQ Email This Model

Datasheet Preview

Use attached product manuals when available. If the manual is not public yet, request the full file directly through RFQ.

Request Full Manual

Commercial Path

Use This Page To Confirm The Model, Then Move To RFQ

Product pages on DRIVEKNMS are designed to verify model, brand and series first, then move the buyer into one clean quotation path.

Technical Dossier

Product Details And Specifications

Allen-Bradley 1771 Series Technical Notes

The Allen-Bradley 1771 I/O system is the foundational input/output platform for the Rockwell Automation PLC-5 programmable controller family. Deployed across heavy industrial sectors — including petrochemical refineries, nuclear power generation facilities, offshore oil platforms, pulp and paper mills, and continuous-process chemical plants — the 1771 backplane architecture has accumulated decades of installed base globally. Its modular slot-based design, housed in 1771-series I/O chassis, allows mixed analog and digital module configurations within a single rack. Despite the PLC-5 platform reaching end-of-life status, the 1771 I/O system remains operational in thousands of legacy installations where full migration to ControlLogix or CompactLogix is deferred due to capital cost, process criticality, or regulatory freeze requirements.

The Evolution of 1771 Architecture

The 1771 I/O platform was introduced alongside the PLC-5 processor family in the early 1980s. The original architecture used a parallel backplane bus operating at TTL logic levels, with modules communicating via a proprietary Allen-Bradley I/O link protocol. Early revisions (Series A and B) established the physical form factor: single-slot and double-slot modules with a 40-pin edge connector interface to the 1771 chassis backplane.

Through the 1990s, Rockwell expanded the catalog to include enhanced analog modules with 12-bit and 16-bit resolution, high-speed counter modules, and specialty thermocouple/RTD input cards. The /B and /C revision suffixes denote incremental hardware changes — typically improved noise immunity, revised firmware, or component substitutions — while maintaining backward compatibility with the same chassis slot and software configuration blocks.

1771 Full Catalog & Functionalities (SKU List)

Analog Input Modules

1771-IFE/B: 8-channel analog input, 4–20 mA / 0–10 V, 12-bit resolution, single-slot
1771-IFE/C: 8-channel analog input, enhanced noise immunity revision C, 12-bit
1771-IF: 4-channel analog input, voltage/current selectable, early-generation module
1771-IFM: 8-channel analog input, millivolt/thermocouple compatible, 16-bit
1771-IR: 8-channel RTD input module, supports PT100/PT1000, 16-bit resolution
1771-IT: 8-channel thermocouple input, J/K/T/E/R/S/B type selectable

Analog Output Modules

1771-OFE1: 4-channel analog output, 4–20 mA, 12-bit, single-ended
1771-OFE2: 4-channel analog output, ±10 V voltage output, 12-bit
1771-OFE3: 4-channel analog output, 0–20 mA current output, 12-bit
1771-OF: 2-channel analog output, early-generation, voltage/current selectable

Digital Input Modules

1771-IA: 16-point AC digital input, 120 VAC, single-slot
1771-IB: 16-point DC digital input, 24 VDC, single-slot
1771-IC: 16-point DC digital input, 48 VDC
1771-IM: 16-point AC digital input, 220 VAC

Digital Output Modules

1771-OA: 16-point AC digital output, 120/240 VAC, triac output
1771-OB: 16-point DC digital output, 24 VDC, transistor output
1771-OBD: 16-point DC digital output, 24 VDC, diagnostic feedback

Communication & Specialty Modules

1771-SDN: DeviceNet scanner module for 1771 chassis
1771-ASB: Remote I/O adapter, connects 1771 chassis to PLC-5 remote I/O link
1771-ACN15: ControlNet adapter module for 1771 I/O chassis

Sourcing Hard-to-Find & Obsolete 1771 Parts

For the 1771-IFE/B specifically, DriveKNMS stocks tested units with full functional verification against the original Rockwell specification. Each unit is inspected for backplane connector integrity, EEPROM configuration retention, and channel-level analog accuracy prior to shipment. Customers operating PLC-5 systems in regulated industries (pharmaceutical, nuclear, refining) can request full traceability documentation including test records and visual inspection reports.

Quality Control for the 1771 Range

The 1771 backplane uses a parallel bus architecture with edge-connector termination. Connector oxidation and pin wear are the primary failure modes for modules removed and reinserted multiple times. DriveKNMS applies the following test protocol to all 1771 modules:

Visual inspection of 40-pin edge connector for oxidation, bent pins, and PCB delamination
Powered bench test in a 1771 chassis with a compatible PLC-5 processor
For analog input modules (including 1771-IFE/B): channel-by-channel signal injection at 4 mA, 12 mA, and 20 mA reference points; accuracy verified against 12-bit full-scale specification
For digital I/O modules: point-by-point state verification under rated voltage and load
Firmware/configuration block read-back to confirm EEPROM integrity
72-hour burn-in soak at ambient temperature prior to packaging

Continue The Model Path

Use system, brand and series routes to compare related published models.

Move from this exact model into the matching system hub, brand archive, model-family archive or lifecycle sourcing route before sending a final RFQ list.