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The 1769-ECL (Part Number: 1769-ECL) is a vital passive component designed to maintain the electrical integrity of the 1769 backplane. Serving as a bus terminator, this left-side end cap is required to complete the communication circuit...
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The 1769-ECL (Part Number: 1769-ECL) is a vital passive component designed to maintain the electrical integrity of the 1769 backplane. Serving as a bus terminator, this left-side end cap is required to complete the communication circuit for Allen-Bradley CompactLogix and MicroLogix 1500 controller systems. Without the installation of a proper terminator like the 1769-ECL, high-speed communication signals across the I/O modules can suffer from reflection and noise, potentially leading to system faults or intermittent data loss.
This module features an open-type enclosure design, intended for installation within a protective industrial control cabinet. It is engineered to withstand standard industrial environments, including high-altitude operations, while drawing negligible power from the system backplane. Its primary role is to ensure the "far end" of the bus is correctly terminated, providing a stable electronic environment for the logic processor and its associated expansion modules.
| Specification | Details |
|---|---|
| Component Function | Left-Hand Bus Termination |
| System Compatibility | 1769 Compact I/O, CompactLogix, MicroLogix 1500 |
| Backplane Current Consumption | 5 mA at 5V DC |
| Operating Altitude | Up to 2000 meters (approx. 6562 feet) |
| Temperature Code | North American T3C |
| Enclosure Type | Open-style (IP20 equivalent for cabinet mounting) |
| Installation Side | Left side of the 1769 assembly |
| Shipping Weight | 0.6 kg |
The 1769-ECL is a mandatory requirement for any 1769-based PLC configuration where the controller or I/O bank expands to the left. It is commonly used in:
Multi-bank systems or specific MicroLogix 1500 setups where the backplane must be electrically "closed" to permit the processor to clear bus-related errors and begin logic execution.
What happens if the 1769-ECL is not installed?
If the bus is not terminated with a 1769-ECL (left) or 1769-ECR (right) as required, the PLC will typically report a "Bus Configuration Error" or a "Major Fault," preventing the controller from entering Run mode.
Does this module require software configuration?
No, the 1769-ECL is a purely hardware-based termination component and does not require any addressing or software setup in RSLogix 500 or Studio 5000.
