Allen-Bradley 1769-CRR1 Right-to-Right Bus Expansion Cable
The Allen-Bradley 1769-CRR1, also cataloged as the 1769-CRR1 Connection Cable, serves as the primary 1769-CRR1 Expansion Cable utilized to execute high-speed backplane extension across Allen-Bradley CompactLogix and MicroLogix 1500 system platforms. Designed as a right bank-to-right bank expansion interconnect, this 30.5 cm physical link extends the internal parallel backplane communication bus across adjacent I/O banks without signal degradation. It carries logic communication, system timing, and internal power distribution signals between separate 1769 chassis banks in expanded controller configurations.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1769-CRR1 |
| Brand | Allen-Bradley |
| Origin | USA |
| Weight | 0.35 kg (0.77 lbs) |
| Dimensions | Length: 30.5 cm (12.0 in) |
| Operating Temp | 0 to 60 deg C (32 to 140 deg F) |
| Power Consumption | Passive (Backplane Bus Extension) |
| Cable Type | Right bank-to-right bank expansion cable |
| Operating Humidity | 5% to 95% non-condensing |
| Operating Altitude | 2000 meters (6561 feet) |
| Operating Vibration | 10 to 500 Hz, 5G (0.030 in max peak-to-peak) |
| Operating Shock | 30G panel mounted (20G DIN rail mounted) |
Backplane Bus Communication & Deterministic Processing
The Allen-Bradley 1769-CRR1 maintains deterministic backplane bus communication velocity across multi-bank CompactLogix layouts by providing a direct, low-latency parallel extension line. Backplane timing synchronization and firmware flash compatibility between host processors (such as 1769-L3x series) and remote I/O banks remain uncompromised over the fixed 30.5 cm cable length. High-density I/O channel scaling is achieved by allowing system architects to split expansion racks horizontally or vertically while adhering to strict backplane signal propagation limits and total power supply distance rating constraints.
Frequently Asked Questions
Q: Does the 1769-CRR1 expansion cable require external termination modules or software configuration?
A: No. The 1769-CRR1 is a passive physical bus extension cable. Backplane signals are automatically routed upon connection, though end caps (1769-ECR or 1769-ECL) must still be installed on the open ends of the final I/O banks to maintain proper backplane termination.
Q: Can multiple 1769-CRR1 cables be connected in series to increase the distance between CompactLogix banks?
A: No. Interconnecting multiple expansion cables in series alters backplane impedance and propagation delay limits, causing communication faults along the 1769 bus. Only one expansion cable may be used per bank junction within the maximum allowed system layout specification.
Field Installation Guidelines
- System Power Isolation: Ensure all AC and DC main power supplies connected to all CompactLogix banks are completely powered down prior to attaching or disconnecting the 1769-CRR1 cable assembly.
- Connector Orientation & Alignment: Align the right bank-to-right bank cable connectors carefully with the 1769 expansion bus ports. Avoid bending or forcing the pin connections to prevent damaging the high-density backplane contacts.
- Mechanical Securing: Fully seat the cable connector cover into the bus interface port until the side locking latches snap into place. Secure the cable housing using the mounting screws to prevent pin fretting under high vibration conditions.
- Cable Routing & Strain Relief: Maintain a natural bend radius for the 30.5 cm cable segment. Do not route the expansion cable in close proximity or parallel to high-voltage AC motor wires, VFD output lines, or inductive load cabling to prevent electromagnetic noise coupling into the logic bus.
Allen-Bradley 1769-CRR1 Right-to-Right Bus Expansion Cable
Allen-Bradley 1769-CRR1 Right-to-Right Bus Expansion Cable
The Allen-Bradley 1769-CRR1, also cataloged as the 1769-CRR1 Connection Cable, serves as the primary 1769-CRR1 Expansion Cable utilized to execute high-speed backplane extension across Allen-Bradley CompactLogix and MicroLogix 1500 system platforms. Designed as a right bank-to-right bank expansion interconnect, this 30.5 cm physical link extends the internal parallel backplane communication bus across adjacent I/O banks without signal degradation. It carries logic communication, system timing, and internal power distribution signals between separate 1769 chassis banks in expanded controller configurations.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1769-CRR1 |
| Brand | Allen-Bradley |
| Origin | USA |
| Weight | 0.35 kg (0.77 lbs) |
| Dimensions | Length: 30.5 cm (12.0 in) |
| Operating Temp | 0 to 60 deg C (32 to 140 deg F) |
| Power Consumption | Passive (Backplane Bus Extension) |
| Cable Type | Right bank-to-right bank expansion cable |
| Operating Humidity | 5% to 95% non-condensing |
| Operating Altitude | 2000 meters (6561 feet) |
| Operating Vibration | 10 to 500 Hz, 5G (0.030 in max peak-to-peak) |
| Operating Shock | 30G panel mounted (20G DIN rail mounted) |
Backplane Bus Communication & Deterministic Processing
The Allen-Bradley 1769-CRR1 maintains deterministic backplane bus communication velocity across multi-bank CompactLogix layouts by providing a direct, low-latency parallel extension line. Backplane timing synchronization and firmware flash compatibility between host processors (such as 1769-L3x series) and remote I/O banks remain uncompromised over the fixed 30.5 cm cable length. High-density I/O channel scaling is achieved by allowing system architects to split expansion racks horizontally or vertically while adhering to strict backplane signal propagation limits and total power supply distance rating constraints.
Frequently Asked Questions
Q: Does the 1769-CRR1 expansion cable require external termination modules or software configuration?
A: No. The 1769-CRR1 is a passive physical bus extension cable. Backplane signals are automatically routed upon connection, though end caps (1769-ECR or 1769-ECL) must still be installed on the open ends of the final I/O banks to maintain proper backplane termination.
Q: Can multiple 1769-CRR1 cables be connected in series to increase the distance between CompactLogix banks?
A: No. Interconnecting multiple expansion cables in series alters backplane impedance and propagation delay limits, causing communication faults along the 1769 bus. Only one expansion cable may be used per bank junction within the maximum allowed system layout specification.
Field Installation Guidelines
- System Power Isolation: Ensure all AC and DC main power supplies connected to all CompactLogix banks are completely powered down prior to attaching or disconnecting the 1769-CRR1 cable assembly.
- Connector Orientation & Alignment: Align the right bank-to-right bank cable connectors carefully with the 1769 expansion bus ports. Avoid bending or forcing the pin connections to prevent damaging the high-density backplane contacts.
- Mechanical Securing: Fully seat the cable connector cover into the bus interface port until the side locking latches snap into place. Secure the cable housing using the mounting screws to prevent pin fretting under high vibration conditions.
- Cable Routing & Strain Relief: Maintain a natural bend radius for the 30.5 cm cable segment. Do not route the expansion cable in close proximity or parallel to high-voltage AC motor wires, VFD output lines, or inductive load cabling to prevent electromagnetic noise coupling into the logic bus.
