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The 1769-L35CR is a high-performance CompactLogix controller from Allen-Bradley, specifically designed for applications that require the ControlNet communication protocol. Unlike standard Ethernet-based controllers, this module integrates a built-in ControlNet port, providing deterministic data transfers and...
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The 1769-L35CR is a high-performance CompactLogix controller from Allen-Bradley, specifically designed for applications that require the ControlNet communication protocol. Unlike standard Ethernet-based controllers, this module integrates a built-in ControlNet port, providing deterministic data transfers and enabling scheduled network bandwidth for time-critical applications. It is ideal for integrating legacy systems or handling complex architectures where synchronization of I/O is essential.
This controller is built for high-availability environments and supports redundant media capabilities through its ControlNet interface, ensuring that network failures do not disrupt critical processes. It features the 1769 series I/O backplane, allowing for a wide range of local and distributed I/O expansions, while maintaining a compact footprint, making it an excellent choice for space-constrained control cabinets.
| Specification | Details |
|---|---|
| Model Number | 1769-L35CR |
| Processor Type | CompactLogix ControlNet Controller |
| User Memory | 1.5 MB Integrated Volatile Memory |
| Communication Ports | 1 x ControlNet Port (BNC Connection) |
| 1 x RS-232 Serial Port (9-pin D-shell) | |
| Maximum Local I/O Modules | 30 Modules (across up to 3 I/O banks) |
| Expansion Capacity | Support for distributed I/O via ControlNet |
| Programming Software | RSLogix 5000 / Studio 5000 Logix Designer |
| Battery Requirements | 1769-BA Lithium Battery for memory retention |
| Operating Temperature | 0°C to 60°C (32°F to 140°F) |
| Module Weight | 0.35 kg |
The 1769-L35CR is commonly used in industries such as water/wastewater, oil and gas, and automotive, where ControlNet is the primary communication backbone. It is particularly suited for long-distance I/O configurations and applications that require deterministic timing, offering enhanced noise immunity with a coaxial physical layer compared to standard copper Ethernet.
Is the 1769-L35CR capable of full CPU redundancy?
The 1769-L35CR supports redundant ControlNet media (via BNC taps), but does not support Hot Backup CPU redundancy like the ControlLogix 1756 series. It provides communication redundancy but not CPU redundancy.
Can I use the RS-232 port for DF1 or Modbus?
Yes, the RS-232 port can be configured for DF1, DH-485 (via converter), or ASCII. With the correct logic blocks, it can also serve as a Modbus RTU Master/Slave interface.
How many I/O banks can this processor manage?
The 1769-L35CR supports up to 3 I/O banks. Ensure you use the appropriate 1769-CRR/CRRL expansion cables and I/O power supplies for each bank to ensure proper operation.
