Compact I/O Left End Cap / Bus Terminator Allen-Bradley 1769-ECL

Availability: 99 left in stock

Product Overview The 1769-ECL is a passive left end cap used to terminate the communication bus on the left side of an...

SKU: 1769-ECL

Manufacturer: Allen Bradley
Product No.: 1769-ECL
Product Type: Compact I/O Left End Cap / Bus Terminator
Product Origin: USA
Payment:T/T, Western Union
Weight: 60g
Shipping port: Xiamen
Warranty: 12 months

Description Reviews

Product Overview

The 1769-ECL is a passive left end cap used to terminate the communication bus on the left side of an Allen-Bradley 1769 Compact I/O bank. While often overlooked, it is essential for maintaining signal integrity across the backplane, preventing reflections that could cause intermittent communication faults or system instability.

Every 1769 I/O assembly requires both a right end cap (1769-ECR) and a left end cap (1769-ECL) for proper operation.

Technical Specifications

Specification	Details
Module Type	1769-ECL
Function	Passive Bus Terminator
Dimensions	118 x 87 x 15 mm
Weight	0.06 kg

Installation and Safety

Positioning: Must be installed on the leftmost end of a 1769 I/O bank.
Bus Connectivity: Ensure the bus lever is fully locked for a secure connection to the 5V DC backplane.
System Integrity: Operating without a properly installed left end cap can cause I/O bus faults or erratic module behavior.
Thermal Consideration: Generates minimal heat but must remain within 0–60 °C to maintain stability of termination resistors.

Common Technical Questions

Do I need the 1769-ECL with a CompactLogix 5370 L1 or L2 controller?
Standard L1 and L2 controllers are packaged units with integrated left-side bus connections. For L3 series controllers or modular expansion banks (e.g., 1769-AENTR), the 1769-ECL is mandatory on the leftmost expansion module or power supply.
Can I use a 1769-ECR (Right End Cap) on the left side?
No. The 1769-ECR and 1769-ECL are not interchangeable. They have mirrored connectors and different internal termination circuits designed for their respective ends.

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