Allen-Bradley 1769-CRL3 CompactLogix Right-To-Left Bus Expansion Cable
Manufacturer: Allen Bradley
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Part Number: 1769-CRL3
Condition：New with Original Package
Product Type: PLC Expansion Cables
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Country of Origin: USA
Payment:T/T, Western Union
Shipping port: Xiamen
Warranty: 12 months
Allen-Bradley 1769-CRL3 Compact I/O Bus Expansion Cable
The Allen-Bradley 1769-CRL3 serves as the primary 1769-CRL3 Expansion Cable utilized to execute right-to-left bus communication extension across CompactLogix platforms. The hardware establishes electrical continuity between the right side of an active I/O bank and the left side of a subsequent expansion bank to route parallel system data lines across separate physical structures.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1769-CRL3 |
| Brand | Allen-Bradley |
| Origin | Standard Factory Sourced |
| Weight | 0.44 lbs (0.20 kg) |
| Dimensions | 1 meter (3.28 feet) length |
| Operating Temp | 0 deg C to 60 deg C (32 deg F to 140 deg F) |
| Power Consumption | 33.6 Watts |
| Backplane Current | 1.4 Amps at 24 VDC |
| Power Dissipation | 7.5 Watts |
| Isolation Voltage | 30 Volts continuous |
| Cable Orientation | Right-to-Left bank connection |
| System Expansion Limit | Maximum 3 I/O banks / 2 expansion cables per system |
| Mechanical Shock | 30G panel-mounted, 20G DIN rail-mounted |
| Vibration | 5G at 10 to 500 Hz |
| Enclosure Type | Open type |
Profinet / EtherNet/IP Deterministic Networks and I/O Density Scaling
The expansion cable maintains direct backplane bus communication velocity across segmented physical racks, sustaining deterministic signal transmission between the main controller bank and peripheral expansion modules. When executing local I/O density scaling, the system architecture permits up to 3 separate I/O banks, provided each additional segment incorporates an independent local power supply block to prevent voltage drops across the 1 meter connection line. Network layout designers must verify firmware flash compatibility across all connected modules to ensure that synchronous data updates pass through the right-to-left bus interface without introducing signal propagation delays into the industrial network loop.
Frequently Asked Questions
Q: Can this cable be reversed to connect a left-side module output to a right-side module input?
A: No. The cable architecture enforces a fixed right-to-left orientation due to the specific physical alignment of the keyed male-female connectors and internal pinning layouts. Reversing the installation direction is mechanically blocked and will disrupt the backplane connection.
Q: Does the installation of the 1769-CRL3 module require specific configuration adjustments in the controller program?
A: No software modification is required for the physical cable itself. However, the system setup must define the hardware modules residing on expansion Bank 1 or Bank 2 within the controller I/O configuration tree to ensure correct data packet routing.
Field Installation Guidelines
- Bus Terminal Seating and Mechanical Locking: Verify that the system power is completely disconnected before mounting. Align the cable termination caps with the standard 1769 tongue-and-groove side tracks on the final module of the originating bank, then slide the connector downward until the integrated bus levers snap into the locked position.
- Bend Radius Constraints and Protection: Anchor the 1 meter flexible conduit section using structural cable clamps inside the panel enclosure. Avoid pulling the cable taut or bending the industrial jacket beyond its minimum specified bend radius to prevent stress fractures on the internal backplane copper conductors.
- Chassis Grounding and Noise Isolation: Ensure both the source and destination DIN rail paths connect to a unified low-resistance industrial earth ground. Route the data bus expansion line away from high-current AC motor leads and variable frequency drives to prevent transient noise pickup on the continuous data lines.