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- 1769-ECR
- CompactLogix I/O Module
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- 118 mm × 87 mm × 32 mm
- 0.13kg
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Technical Report: 1769-ECR Compact I/O Right End Cap (Bus Terminator)
1. Product Overview
The 1769-ECR is a right end cap module used in Compact I/O and CompactLogix-based industrial automation systems. It is installed at the far right side of a Compact I/O module assembly to terminate the backplane communication bus.
Its function is purely structural and electrical. It does not perform any signal processing, control logic, or communication tasks. Instead, it ensures that the internal I/O backplane is properly terminated so that the entire system operates reliably.
Without this module, the Compact I/O system cannot be correctly completed, and backplane communication may become unstable or fail.
2. Brand and Series Information
Brand: Industrial automation control platform ecosystem
Series: 1769 Compact I/O Series
Product Family: Compact I/O Accessories
Module Type: Right End Cap / Bus Terminator
3. Product Function Description
The 1769-ECR serves as the termination point of a Compact I/O system backplane.
Main functions include:
- Terminating the right end of the 1769 I/O communication bus
- Completing electrical continuity of the backplane system
- Ensuring stable communication between I/O modules
- Preventing signal reflection and communication errors
- Enabling proper system initialization during PLC startup
It is always installed as the last component on the right side of a Compact I/O rack.
4. Technical Parameters
Electrical Specifications
| Parameter | Value |
|---|---|
| Backplane Voltage | 5.1 V DC |
| Current Consumption | 5 mA |
| 24V DC Consumption | 0 mA |
| Power Dissipation | ~7.5 W |
| Backplane Role | Passive termination device |
| Electrical Function | Bus termination only |
Mechanical Specifications
| Parameter | Value |
|---|---|
| Dimensions | 118 mm × 87 mm × 32 mm |
| Depth | ~85 mm (installed form factor) |
| Weight | 0.13 kg (approx. 0.286 lb) |
| Mounting Type | DIN rail / chassis mount |
| Housing Type | Open industrial module housing |
| Installation Position | Rightmost end of I/O rack |
Environmental Specifications
| Parameter | Value |
|---|---|
| Operating Temperature | 0°C to 60°C |
| Storage Temperature | -40°C to 85°C |
| Humidity | 5% – 95% non-condensing |
| Vibration Resistance | Industrial control cabinet standard |
| Shock Resistance | Up to 15G operation |
| Altitude Rating | Up to 2000 m without derating |
5. Product Advantages
1. Essential System Termination
Ensures the Compact I/O backplane is properly terminated for stable system operation.
2. High System Reliability
Prevents communication instability caused by an open-ended I/O bus.
3. Simple Installation
Plug-and-play design requires no configuration or wiring.
4. Mandatory System Component
Required for every Compact I/O system configuration, ensuring consistent system design.
5. Maintenance Friendly
Easy replacement during system servicing without affecting other modules.
6. Industrial Robustness
Designed for long-term use in harsh industrial environments with vibration and temperature variations.
6. Application Areas
The 1769-ECR is used in nearly all Compact I/O-based automation systems, including:
- Manufacturing production lines
- Packaging machinery
- Conveyor systems
- Automotive assembly systems
- Process control plants
- Food and beverage production
- Pharmaceutical automation systems
- General industrial PLC control cabinets
It is always required as the final module in the I/O rack structure.
7. Recommended Models (Same Series / Related Components)
| Model | Type | Key Parameters | Application |
|---|---|---|---|
| 1769-ECL | Left End Cap | Bus termination for left side | Completes I/O rack structure |
| 1769-IF8 | Analog Input Module | 8-channel analog input | Process signal acquisition |
| 1769-OF2 | Analog Output Module | 2-channel output control | Industrial process control |
| 1769-IQ16 | Digital Input Module | 16-point DC input | Machine signal monitoring |
| 1769-OB16 | Digital Output Module | 16-point transistor output | Actuator control |
8. Other Popular Models (Same Platform – Widely Used)
| Model | Type | Key Parameters | Application |
|---|---|---|---|
| 1769-L33ER | PLC Controller | EtherNet/IP CPU, integrated control | Machine automation |
| 1769-L36ERM | PLC Controller | High-performance motion control CPU | Advanced automation systems |
| 1769-AENTR | EtherNet/IP Adapter | Dual-port Ethernet, DLR support | Distributed I/O networking |
| 1769-SDN | DeviceNet Scanner Module | Fieldbus master communication | Legacy industrial networks |
| 1769-ASCII | Serial Communication Module | Dual-port ASCII interface | Barcode and printer systems |
9. System Role Summary
The 1769-ECR is a mandatory termination component in Compact I/O systems. While it does not contribute to control logic or signal processing, it plays a critical role in ensuring electrical and communication integrity of the entire backplane architecture.
Without proper termination, Compact I/O systems cannot maintain stable communication between modules.
10. Summary
The 1769-ECR is a fundamental structural component in Compact I/O automation systems, responsible for terminating the right end of the I/O backplane. It ensures stable communication, system reliability, and correct electrical behavior of the entire module rack.
Its importance lies not in functionality processing, but in guaranteeing that the system architecture operates correctly as a complete and stable unit.