Allen-Bradley 1769-CRR3 CompactLogix Expansion Cable
Configured for multi-bank backplane extension in CompactLogix architectures, the Allen-Bradley 1769-CRR3 (1769-CRR3 Expansion Cable) provides direct physical/electrical execution. It connects two 1769 Compact I/O banks, routing 24 VDC power and high-speed backplane signals over a 3.28 ft bus interface. The cable enables right-to-right I/O bank interconnection without requiring additional network adapter modules or external communications circuitry.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1769-CRR3 |
| Brand | Allen-Bradley |
| Origin | USA |
| Weight | 0.06 lbs (0.03 kg) |
| Dimensions | Cable Length: 3.28 ft (1.0 m) |
| Operating Temp | 0 to 60 deg C (32 to 140 deg F) |
| Power Consumption | 33.6 W |
| Backplane Current | 1.4 A at 24 VDC |
| Power Dissipation | 7.5 W |
| Connection Orientation | Right-to-Right Expansion |
| Isolation Voltage | 30 V continuous |
Backplane Bus & Deterministic I/O Execution
The 1769-CRR3 maintains deterministic backplane bus communication velocity across extended CompactLogix system configurations. Internal shielded conductors extend the parallel 1769 I/O bus, passing timing signals, data words, and system reset lines between adjacent chassis banks. Built-in bus line termination and noise rejection layers maintain signal integrity and firmware compatibility across expansion banks without adding system data transfer latencies.
Frequently Asked Questions
Q: What is the physical orientation limit when using the 1769-CRR3 cable?
A: The 1769-CRR3 is specifically keyed and wired for Right-to-Right expansion bank connection. It connects the right end of a primary 1769 chassis bank to the right end of an adjacent secondary expansion bank.
Q: Does the 1769-CRR3 pass backplane power to secondary I/O banks?
A: Yes, the cable carries up to 1.4 A at 24 VDC backplane current. However, power supply distance ratings and total bank current consumption must be calculated to determine if a secondary 1769 power supply is required on the expansion bank.
Field Installation Guidelines
- Power Isolation: De-energize all 1769 chassis power supplies before connecting or disconnecting expansion cable connectors.
- Connector Keying & Engagement: Align the right-angle connectors with the right-hand bus expansion ports on each 1769 bank and press firmly until the locking latches click into place.
- Bend Radius Limits: Maintain a minimum bend radius of 4 inches (100 mm) along the cable body to protect internal differential data conductors from physical damage or shielding breakdown.
- Noise Separation: Route the expansion cable at least 6 inches away from high-voltage AC lines, drive outputs, and high-current inductive field wiring to prevent electromagnetic interference.
- Bus Termination Verification: Ensure end-cap bus terminators are installed on the remaining open expansion ports at the physical ends of the CompactLogix system backplane.
Allen-Bradley 1769-CRR3 CompactLogix Expansion Cable
Allen-Bradley 1769-CRR3 CompactLogix Expansion Cable
Configured for multi-bank backplane extension in CompactLogix architectures, the Allen-Bradley 1769-CRR3 (1769-CRR3 Expansion Cable) provides direct physical/electrical execution. It connects two 1769 Compact I/O banks, routing 24 VDC power and high-speed backplane signals over a 3.28 ft bus interface. The cable enables right-to-right I/O bank interconnection without requiring additional network adapter modules or external communications circuitry.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1769-CRR3 |
| Brand | Allen-Bradley |
| Origin | USA |
| Weight | 0.06 lbs (0.03 kg) |
| Dimensions | Cable Length: 3.28 ft (1.0 m) |
| Operating Temp | 0 to 60 deg C (32 to 140 deg F) |
| Power Consumption | 33.6 W |
| Backplane Current | 1.4 A at 24 VDC |
| Power Dissipation | 7.5 W |
| Connection Orientation | Right-to-Right Expansion |
| Isolation Voltage | 30 V continuous |
Backplane Bus & Deterministic I/O Execution
The 1769-CRR3 maintains deterministic backplane bus communication velocity across extended CompactLogix system configurations. Internal shielded conductors extend the parallel 1769 I/O bus, passing timing signals, data words, and system reset lines between adjacent chassis banks. Built-in bus line termination and noise rejection layers maintain signal integrity and firmware compatibility across expansion banks without adding system data transfer latencies.
Frequently Asked Questions
Q: What is the physical orientation limit when using the 1769-CRR3 cable?
A: The 1769-CRR3 is specifically keyed and wired for Right-to-Right expansion bank connection. It connects the right end of a primary 1769 chassis bank to the right end of an adjacent secondary expansion bank.
Q: Does the 1769-CRR3 pass backplane power to secondary I/O banks?
A: Yes, the cable carries up to 1.4 A at 24 VDC backplane current. However, power supply distance ratings and total bank current consumption must be calculated to determine if a secondary 1769 power supply is required on the expansion bank.
Field Installation Guidelines
- Power Isolation: De-energize all 1769 chassis power supplies before connecting or disconnecting expansion cable connectors.
- Connector Keying & Engagement: Align the right-angle connectors with the right-hand bus expansion ports on each 1769 bank and press firmly until the locking latches click into place.
- Bend Radius Limits: Maintain a minimum bend radius of 4 inches (100 mm) along the cable body to protect internal differential data conductors from physical damage or shielding breakdown.
- Noise Separation: Route the expansion cable at least 6 inches away from high-voltage AC lines, drive outputs, and high-current inductive field wiring to prevent electromagnetic interference.
- Bus Termination Verification: Ensure end-cap bus terminators are installed on the remaining open expansion ports at the physical ends of the CompactLogix system backplane.
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