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

Product Description

The 1769-ECR is a Right End Cap for Allen Bradley CompactLogix and MicroLogix 1500 I/O banks. It terminates the 1769 backplane bus, ensuring stable communication and protecting the exposed pins of the last I/O module. Essential for all 1769 I/O banks, the Series A design provides a secure latch to maintain electrical continuity and prevent signal reflection.

Technical Specifications

Key Notes

• Essential: One 1769-ECR per I/O bank; placed at the far right of the last module.

• Functionality: Prevents bus faults, signal reflection, and protects backplane pins.

• Compatibility: Works with all current and legacy 1769 I/O modules.

FAQs

Q: Can a CompactLogix system run without the 1769-ECR?
A: No. Missing the end cap causes a bus fault and prevents communication with expansion modules.

Q: Is there a left end cap?
A: Typically not required; the controller or a 1769-ECL handles left-side termination if needed.

Q: Are there other series?
A: Series A is standard; minor revisions exist, but all remain fully compatible.