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Description
The Allen-Bradley 1769-CRR3 is a specialized bus expansion cable engineered for CompactLogix and MicroLogix 1500 controller systems. The "RR" designation signifies a Right-to-Right bank connection, allowing for flexible system architectures where I/O banks are positioned in non-linear configurations, such as side-by-side mounting within a control cabinet. This cable effectively extends the 1769 backplane, enabling the controller to communicate with I/O modules located across separate DIN rails or bank segments.
Features
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Right-to-Right Configuration: Designed for specific physical orientations where bank connections require right-side alignment.
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System Compatibility: Fully compatible with Allen-Bradley CompactLogix and MicroLogix 1500 I/O platforms.
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Extended Reach: Provides a 1-meter (3.28 ft) cable length for bridging I/O banks within a single enclosure.
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Signal Integrity: Maintains robust backplane communication across expanded distances.
Applications
This expansion cable is used in industrial automation environments requiring distributed I/O across multiple DIN rails. It is commonly utilized in control panels where space constraints or specific wiring requirements necessitate non-linear bank layouts, ensuring the controller maintains seamless communication with all connected Compact I/O modules.
Technical Specifications
| Model |
1769-CRR3 |
| Cable Type |
Right-to-Right Expansion Cable |
| Length |
1 meter (3.28 ft) |
| Backplane Current |
1.4 A at 24 VDC |
| Isolation Voltage |
30V (Continuous) |
| Power Consumption |
33.6 W |
| Power Dissipation |
7.5 W |
| Operating Temperature |
0 to 60 degC (32 to 140 degF) |
| Storage Temperature |
-40 to 85 degC (-40 to 185 degF) |
| Series Compatibility |
Series A and B |
Installation Guidelines
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Power Down: Always remove power from the system before connecting or disconnecting expansion cables to prevent damage to the backplane or modules.
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Expansion Power: When extending the backplane, ensure a 1769 expansion power supply is installed on the receiving bank to maintain required signal integrity and voltage levels.
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Cable Routing: Route the expansion cable away from high-voltage power lines and sources of electromagnetic interference (EMI) to ensure reliable data communication.
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Secure Connections: Ensure the cable connectors are fully seated and locked into the I/O bank end-caps to prevent intermittent communication errors.
FAQ
Does the 1769-CRR3 require an external power supply?
While the cable itself does not require external power, extending the backplane often increases the power load. You must verify your system's power budget and install a 1769 expansion power supply on the receiving bank if the total current draw exceeds the capacity of the primary power supply.
Can this cable be used for Left-to-Right connections?
No, the 1769-CRR3 is specifically keyed and wired for Right-to-Right connections. Using an incorrect cable type can result in improper signal mapping or failure to establish communication with the expanded I/O bank.
