Allen-Bradley 1769-ECR – Right End Cap Terminator | CompactLogix 1769 I/O Platform
Engineering Background
The Allen-Bradley 1769-ECR is the mandatory right-side bus termination module for all CompactLogix 1769 I/O expansion systems. Every 1769 I/O bank requires one left end cap (1769-ECL) and one right end cap (1769-ECR) to complete the internal communication bus and provide mechanical protection to the terminal I/O assembly. Without proper termination, the backplane bus remains open, causing system faults and preventing controller recognition of downstream modules.
Product Positioning
Designed for procurement engineers and system integrators sourcing replacement or expansion components for existing CompactLogix architectures. The 1769-ECR is a non-programmable passive termination device — its correct installation is a prerequisite for any 1769 I/O bank commissioning or field expansion. Konmask.com maintains verified stock of genuine Allen-Bradley 1769-ECR units to support MRO and project-based procurement.
Complete Technical Specifications
- Part Number: 1769-ECR
- Manufacturer: Allen-Bradley / Rockwell Automation
- Series: CompactLogix 1769 I/O
- Function: Right-side bus termination cap for 1769 I/O expansion banks
- Mounting: DIN rail or panel mount, snap-fit to rightmost 1769 I/O module
- Bus Interface: 1769 side-mount connector (right-side termination)
- Operating Temperature: 0 °C to 60 °C (32 °F to 140 °F)
- Storage Temperature: –40 °C to 85 °C (–40 °F to 185 °F)
- Relative Humidity: 5% to 95% non-condensing
- Dimensions (H × W × D): Approx. 118 mm × 17.5 mm × 87 mm
- Weight: Approx. 60 g
- Enclosure Rating: Open type (IP20 equivalent when installed)
- Agency Certifications: UL Listed, CE Marked, cUL
- Compatible Controllers: All CompactLogix L1x, L2x, L3x, L4x, L43, L45 series
- Companion Module: 1769-ECL (Left End Cap, sold separately)
Proven Application Environments
- Automotive assembly line I/O expansion panels
- Food & beverage processing control cabinets
- Water/wastewater SCADA field panels
- Oil & gas wellhead and pipeline automation
- Pharmaceutical batch control systems (21 CFR Part 11 environments)
- Machine tool and packaging OEM control systems
- MRO replacement in any existing 1769 I/O bank
Engineering Advantages
- Bus Integrity: Provides definitive electrical termination of the 1769 backplane bus, eliminating reflections and communication errors
- Mechanical Protection: Shields the rightmost module’s side connector from contamination, vibration damage, and accidental contact
- Zero Configuration: Passive device — no firmware, no addressing, no commissioning steps required
- Compact Form Factor: Minimal panel footprint; does not consume a module slot
- Genuine OEM Part: Full Rockwell Automation traceability and warranty coverage
System Architecture & Signal Flow
In a standard CompactLogix 1769 I/O bank, the controller or adapter module anchors the left side of the bank. I/O modules are added sequentially to the right. The 1769-ECL terminates the left end of the bus at the controller/adapter interface, while the 1769-ECR terminates the right end of the last I/O module in the bank. The internal bus carries power distribution and backplane communication signals; open termination on either end causes the controller to report a module configuration fault and halt I/O scanning for the affected bank.
[CompactLogix Controller] — [1769-ECL] — [I/O Module 1] — [I/O Module 2] — ... — [I/O Module N] — [1769-ECR]
←————————— 1769 Backplane Bus ————————→
Sourcing & Quality Verification
- All units sourced from authorized Rockwell Automation distribution channels or verified surplus with full traceability documentation
- Pre-shipment inspection: visual, label authenticity, connector integrity, and date-code verification
- Packaging: original OEM carton or equivalent ESD-safe packaging with tamper-evident seal
- Certificate of Conformance (CoC) available upon request
- Counterfeit-risk screening applied to all non-factory-sealed units
Procurement Process
- Step 1: Add to cart or submit an RFQ via [email protected] with quantity and required delivery date
- Step 2: Receive order confirmation and lead-time estimate within 1 business day
- Step 3: Payment via T/T, PayPal, or approved credit terms (B2B accounts)
- Step 4: Shipment with tracking number and CoC documentation
- Step 5: Post-delivery technical support available via email or phone
Technical FAQ
Q: Can I use the 1769-ECR on the left side of the bank?
A: No. The 1769-ECR is right-side only. The left side requires the 1769-ECL. The connectors are physically keyed and non-interchangeable.
Q: Is the 1769-ECR required if I only have one I/O module?
A: Yes. Even a single-module bank requires both end caps to complete the bus and prevent controller faults.
Q: Does the 1769-ECR consume a module slot or backplane address?
A: No. It is a passive termination device and is invisible to the controller’s I/O tree.
Q: What is the typical lead time?
A: In-stock units ship within 1–3 business days. For large-quantity orders, contact us for availability confirmation.
Q: Can you provide documentation for incoming inspection?
A: Yes. CoC, date-code photos, and sourcing chain documentation are available upon request for all orders.
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