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Key Technical Specifications
| Parameter | Value / Specification |
| Catalog Number | 1769-ECR |
| Module Type | Right-Hand End Cap Terminator |
| Bus Position | Rightmost end of the 1769 expansion bank or chassis |
| Backplane Current Draw | 0 mA (Passive component) |
| Compatible Systems | CompactLogix (1769-L2x, 1769-L3x, 1768/1769), MicroLogix 1500, 1769 Distributed I/O |
| Function | Completes backplane communication circuit and protects pins from ESD/environmental exposure |
| Isolation Voltage | Verified to match system backplane rating (30V continuous) |
| Mounting | Locks directly onto the right-side bus connector of the last 1769 I/O module |
| Dimensions | 118 x 35 x 87 mm (4.65 x 1.38 x 3.43 in) |
| Operating Temperature | 0 to 60°C (32 to 140°F) |
Product Introduction & Supply Chain Strategy
This product is a Brand New Surplus unit. It is not used, not pulled from a decommissioned plant, and not refurbished. All modules undergo rigorous quality verification to ensure OEM-level reliability. The Allen-Bradley 1769-ECR is a right-hand bus terminator end cap designed to seal and complete the internal backplane bus circuit on CompactLogix and MicroLogix 1500 control systems. Without a properly seated 1769-ECR, the PLC processor will register a major bus fault and halt all control logic execution.
Stocking this item as New Surplus is a low-cost, high-impact defense against unexpected system shutdowns. Missing, broken, or hairline-cracked end caps on second-hand machinery can cause intermittent signal reflection, bus noise, or exposed pin short-circuits that bring down an entire production line. Sourcing factory-fresh New Surplus hardware guarantees clean signal impedance matching across the backplane bus, maintains physical locking integrity, and delivers maximum Total Cost of Ownership value by preventing frustrating, hard-to-diagnose system faults.
1769-ECR
Installation & Configuration Guide
1.Pre-Installation (Prep & Safety):Safety warning: Always remove power before attaching or detaching bus end caps.
Isolate main AC/DC power to the CompactLogix or MicroLogix chassis and apply Lock-Out/Tag-Out (LOTO) procedures. Put on a grounded anti-static wrist strap before touching backplane contacts. Inspect the right-side bus interface pins of the last installed 1769 I/O module for dust or physical damage.
2.Removal:
Locate the top and bottom locking levers on the existing 1769-ECR end cap. Slide the locking levers open to disengage the mechanical tabs from the adjacent 1769 I/O module. Pull the end cap straight to the right to remove it from the backplane connector.
3.Installation (Clone & Seat):
Unpack the New Surplus 1769-ECR end cap inside an ESD-protected workstation. Ensure the top and bottom locking levers are in the open position. Align the end cap connector pins with the right-side socket of the last 1769 module on the rail. Slide the 1769-ECR firmly to the left until it sits flush against the adjacent module, then snap both locking levers closed to secure the connection.
4.Power-On & Testing:
Reapply backplane power to the controller. Observe the controller status LEDs: verify the OK LED transitions to solid green and the I/O bus status indicator shows no active backplane expansion faults.
Firmware/Software Versions & Upgrade Notes
- Firmware Dependency: None (passive mechanical and circuit termination device).
- System Requirement: Mandatory for all 1769 Compact I/O expansion banks. If the controller detects an open backplane bus condition caused by a missing or unlatched 1769-ECR, it will generate an unrecoverable major error code (such as Major Fault Type 01 Code 60).
- Left-Hand Alternative: Note that the 1769-ECR is strictly for the right side of the bank. If a left-hand bus termination cap is needed for specific expansion configurations, catalog number 1769-ECL must be used instead.
Frequently Asked Questions (FAQ)
Why is a simple plastic end cap like the 1769-ECR critical for system operation?
The 1769-ECR is not just a protective dust cover; it contains internal passive termination circuitry that completes the high-speed data bus loop for the 1769 backplane. If the 1769-ECR is missing, unlatched, or damaged, backplane signals reflect back down the line, causing communication timeouts, severe electrical noise, or an immediate PLC processor halt.
Are these 1769-ECR units genuine OEM products?
Yes. We strictly guarantee that every 1769-ECR supplied is 100% Original OEM New Surplus. Sourced from audited distributor excess, panel builder reserves, and canceled project inventories, each end cap undergoes visual and mechanical latch inspections before shipment.
Can I hot-swap or remove the 1769-ECR while the PLC chassis is powered?
No. Removing the 1769-ECR while the backplane is powered immediately breaks the bus continuity circuit, triggering an instant major controller fault and halting all running machine logic. Always turn off system power before removing or attaching bus end caps.
What is the difference between 1769-ECR and 1769-ECL?
The 1769-ECR is the Right-End Cap Terminator, used on the far right end of a 1769 expansion bank. The 1769-ECL is the Left-End Cap Terminator, used on the far left end of an expansion bank when connected via a expansion cable. They are physically keyed and cannot be interchanged.
What warranty coverage is provided with this New Surplus bus terminator?
All New Surplus 1769-ECR end caps include our standard 1-year replacement warranty. If any mechanical latch failure or internal termination fault occurs within 12 months under normal working conditions, we will replace the unit immediately from our available stock.
