Allen-Bradley 1769-ECR Compact I/O Right End Cap

Description

The Allen-Bradley 1769-ECR is a right end cap and terminator designed for use with the Compact I/O system topology. As an essential component for system integrity, the 1769-ECR terminates the internal communication bus of a Compact I/O expansion bank or controller chassis, such as those utilizing 1769-L32E controllers. Every 1769 Compact I/O platform requires a functional end cap to secure signal continuity across the backplane bus. The module is engineered as open-type equipment for clean indoor industrial environments and must be mounted within a protective enclosure suited to local environmental hazards.

Features

• Bus Termination: Completes the electrical communication bus path at the rightmost end of a 1769 Compact I/O assembly.
• Direct Backplane Powering: Draws a minimal current of 5 mA directly from the 5.1V DC backplane bus, requiring no external power connections.
• Integrated Locking Mechanism: Provides mechanical stability and secure locking to adjacent I/O modules via integrated sliding latches.
• DIN Rail Earthing: Achieves structural grounding automatically through direct contact with a properly earthed DIN rail.

Applications

• System bus termination for Allen-Bradley CompactLogix and Compact I/O architectures.
• Factory automation, machine control, and distributed I/O control systems.
• Hazardous location installations requiring Class I, Division 2 or Zone 2 safety certifications.

Technical Specifications

Installation Guidelines

• DIN Rail Mounting: Mount the module directly on a zinc-plated chromate-passivated steel DIN rail to ensure low electrical resistance and reliable earthing. Avoid aluminum or plastic rails which can corrode or degrade grounding paths.
• Enclosure Installation: Install inside an enclosure that requires a tool for access, provides a minimum ingress protection rating of IP54 for Zone 2 zones, and satisfies a flame spread rating of 5VA.
• Electrostatic Discharge Protection: Avoid touching the internal connector pins or circuit traces during assembly. Work at a static-safe station or wear a grounded wrist strap when handling the unit.
• Bus Attachment: Slide the end cap firmly into the right side of the final I/O module and secure the communication path using the built-in locking mechanism.

Compliance and Certifications

• Class I, Division 2, Groups A, B, C, D 
• UKEX (II 3 G Ex ec IIC T4 Gc; Certificate: UL22UKEX2516X) 
• ATEX (II 3 G Ex ec IIC T4 Gc; Certificate: DEMKO 12 ATEX 1116807X) 
• IECEx (Ex ec IIC T4 Gc; Certificate: IECEx UL 21.0112X)