Allen-Bradley 1771 PC Board Modules SP-110996 / SP-105060 / 105066-02

Name: Allen-Bradley 1771 PC Board Modules SP-110996 / SP-105060 / 105066-02
Brand: Allen-Bradley

Model: SP-110996 SP-105060 105066-02

Brand Allen-Bradley

Series 1771

Model SP-110996 SP-105060 105066-02

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Technical Dossier

Product Details And Specifications

Allen-Bradley 1771 Series Technical Notes

The Allen-Bradley 1771 I/O system, developed by Rockwell Automation, represents one of the most widely deployed programmable controller platforms in global heavy industry. Installed across petrochemical refineries, nuclear power facilities, offshore platforms, pulp and paper mills, and automotive assembly lines, the 1771 chassis-based architecture has maintained a dominant installed base since its introduction in the late 1970s. PC boards such as the SP-110996, SP-105060, and 105066-02 are internal replacement circuit boards used to restore failed 1771-series I/O modules and processor units to full operational specification without full module replacement — a critical capability for facilities operating legacy control infrastructure.

The Evolution of 1771 Architecture

The 1771 platform was introduced as part of Allen-Bradley's PLC-2 and PLC-3 controller families and later extended to support the PLC-5 processor series. The architecture is built around a passive backplane chassis (available in 4-, 8-, 12-, and 16-slot configurations) with a parallel I/O bus. Over four decades, the platform evolved through multiple generations:

Early Generation (1977–1985): PLC-2 compatible I/O with discrete and analog modules. Limited diagnostics.
Mid Generation (1985–1995): PLC-5 integration, expanded analog resolution, introduction of specialty modules (HART, encoder, servo).
Late Generation (1995–2010): ControlNet and DH+ communication adapters added. Enhanced fault diagnostics. Module-level replacement parts (PC boards) became standard maintenance items.
End-of-Life / Sustaining Phase (2010–present): Rockwell Automation has formally discontinued new production of most 1771 modules. Facilities are advised to maintain spare parts inventory. PC board-level repair is the primary cost-effective maintenance strategy.

Compatibility note: 1771 I/O modules are not directly interchangeable with the newer 1746 (SLC 500) or 1756 (ControlLogix) platforms without chassis and wiring modifications.

1771 Series Full Catalog & Functionalities (SKU List)

The following represents a cross-section of the Allen-Bradley 1771 module catalog, organized by functional category. All models listed are genuine Allen-Bradley / Rockwell Automation part numbers.

Discrete Input Modules

1771-IA: 120V AC 16-point discrete input module
1771-IB: 24V DC 16-point discrete input, source type
1771-IC: 220V AC 8-point discrete input module
1771-ID: 24V DC 32-point discrete input module
1771-IG: TTL-compatible 32-point discrete input module

Discrete Output Modules

1771-OA: 120V AC 16-point discrete output, triac type
1771-OB: 24V DC 16-point discrete output, transistor sink
1771-OD: 24V DC 32-point discrete output module
1771-OW: Relay contact 16-point discrete output module

Analog I/O Modules

1771-IFE: 8-channel analog input, 4–20 mA / 0–10V configurable
1771-OFE1: 4-channel analog output, 4–20 mA
1771-OFE2: 4-channel analog output, 0–10V DC

Specialty & Communication Modules

1771-ASB: Remote I/O adapter for 1771 chassis, DH+ compatible
1771-DCM: Direct communication module for DH+ network integration
1771-IXHR: High-resolution thermocouple/RTD input module

PC Board Replacement Parts (Current Listing)

SP-110996: Replacement PC board for 1771-series I/O module internal logic circuit
SP-105060: Internal circuit board assembly for 1771 analog or discrete module repair
105066-02: Revision 02 PC board sub-assembly for 1771 module restoration

Sourcing Hard-to-Find & Obsolete 1771 Series Parts

Our sourcing capabilities for the 1771 platform include:

DriveKNMS provides lifecycle extension support for facilities that cannot migrate to ControlLogix or other modern platforms due to process criticality, budget constraints, or regulatory requirements.

Quality Control for the 1771 PC Board Range

All 1771 PC boards processed by DriveKNMS undergo a structured inspection and functional verification protocol prior to dispatch:

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