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1769-ECL

Allen-Bradley 1769-ECL | CompactLogix Left Terminator

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  • Manufacturer: Allen-Bradley

  • Product No.: 1769-ECL

  • Product Type: Compactlogix End Cap

  • Product Origin: USA

  • Payment:T/T, Western Union

  • Weight: 100g

  • Shipping port: Xiamen

  • Warranty: 12 months

30 kunlik qaytarish siyosati · 12 oylik kafolat
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Product Overview

The Allen-Bradley 1769-ECL serves as the mandatory termination point for the left side of any CompactLogix or MicroLogix 1500 controller system. This specialized hardware module completes the internal communication bus, ensuring signal integrity across all connected I/O modules. Without the 1769-ECL, the backplane circuit remains open, leading to critical system faults and data loss. Engineered for industrial reliability, it protects internal bus connectors while providing a secure mechanical finish for the PLC rack.

Technical Configuration & Hardware Architecture

The 1769-ECL utilizes a passive yet essential hardware architecture. It functions as the physical and electrical "bookend" of the modular assembly, specifically designed for impedance matching within the 1769 platform.

Passive Bus Termination

The internal circuitry features precision resistors that prevent signal reflection on the high-speed data bus. This ensures that the controller maintains stable communication with every expansion module in the local rack.

Interlocking Mechanical Design

The module incorporates a rugged tongue-and-groove interface. This design allows the 1769-ECL to slide and lock firmly into the adjacent controller or I/O module, creating a unified, vibration-resistant assembly suitable for heavy-duty applications.

Technical Specifications

Feature Specification
Model Number 1769-ECL
Module Type Left End Cap / Terminator
Compatibility CompactLogix 1769, MicroLogix 1500
Bus Current Draw 5 mA @ 5.1V DC
Operating Temperature 0°C to 60°C (32°F to 140°F)
Operating Shock 20g (DIN Rail), 30g (Panel Mount)
Dimensions (HxWxD) 118 x 15 x 87 mm

Installation & Engineering Guide

Engineers must install the 1769-ECL to prevent "Bus Expansion" errors in the controller's diagnostic log. Proper installation ensures consistent system uptime.

Physical Integration

Align the bus connectors of the 1769-ECL with the leftmost module in your stack. Press the module firmly until the locking latches engage. Ensure the DIN rail is properly grounded to mitigate electromagnetic interference (EMI).

System Verification

Once installed, verify that the "I/O" status LED on the controller is solid green. If a fault persists, inspect the end cap for physical damage or improper seating on the bus pins.

Engineering Advantages

  • Enhanced Signal Integrity: Eliminates signal noise and data corruption on the backplane.
  • Rugged Durability: Withstands high-vibration environments, making it ideal for mobile machinery.
  • Platform Versatility: Supports both high-end CompactLogix and legacy MicroLogix 1500 controllers.

Technical FAQs

Q1: Is the 1769-ECL interchangeable with the 1769-ECR?
A1: No. The 1769-ECL is for the left side only. The 1769-ECR is the right-side terminator and is not physically compatible with the left-hand slot.

Q2: Does this module require software configuration?
A2: No. It is a passive hardware component. It does not appear in the I/O tree of Studio 5000, but its physical presence is mandatory for the bus to function.

Q3: What happens if the 1769-ECL is missing?
A3: The PLC will enter a major fault state, and all local I/O communication will cease because the data bus remains an open circuit.

Product Resources

📄 Download PDF
🏷️ Tags: Compactlogix End Cap

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