Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 1769-ECR |
| Manufacturer | Allen‑Bradley (Rockwell Automation) |
| Product Type | Right End Cap / Bus Terminator |
| Compatible Series | 1769 CompactLogix 5370, 1769 Compact I/O |
| Bus Current Draw (5.1V) | 5 mA (typical) |
| Grounding Terminal | Integrated M4/M5 screw (PE) |
| Enclosure Rating | Open-style (IP20 equivalent), for cabinet use only |
| Operating Temperature | 0 °C to 60 °C (32 °F to 140 °F) |
| Storage Temperature | -40 °C to 85 °C |
| Relative Humidity | 5% to 95% non-condensing |
| Operating Altitude | Up to 2000 m (6562 ft) |
| Vibration Resistance | 5g (10–500 Hz) |
| Shock Resistance | 20g (DIN rail), 30g (panel mount) |
| Weight | Approx. 130 g (0.286 lb) |
Main Features and Advantages
Essential bus termination: The 1769‑ECR is not an optional accessory; it contains critical termination resistors for the FlexBus backplane. Installing it correctly ensures that high-speed digital signals are properly terminated, eliminating reflections that cause data corruption and controller faults in CompactLogix systems.Integrated safety grounding: The end cap includes a dedicated protective earth (PE) terminal (M4 or M5 screw). This provides a centralized grounding point for the entire I/O rack, which is essential for meeting EMC (electromagnetic compatibility) standards and protecting against electrical noise and surges in industrial environments.Robust mechanical lock: Designed with a positive locking mechanism, it securely latches onto the DIN rail and interlocks with the last I/O module. This prevents the module string from shifting due to vibration and provides strain relief for the backplane connectors.
Application Field
The 1769‑ECR is used in every application that employs a 1769-series CompactLogix or Compact I/O system. It has no logic function but is critical for system integrity:
- Machine control panels: Sealing and terminating racks of 1769 digital/analog I/O modules.
- Process skids: Providing a grounding point for distributed I/O assemblies.
- OEM equipment: Ensuring compliance with electrical standards (UL, CE) by completing the enclosure assembly.
Related Products
- 1769‑ECL: The left end cap, used when the system is built from right to left (less common).
- 1769‑L2x / L3x Series: CompactLogix controllers that require the 1769‑ECR at the end of their expansion I/O.
- 1769‑AENTR: CompactLogix Ethernet/IP communication adapter, often used in systems terminated with an ECR.
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