Product Overview
When your production line demands a robust and reliable control solution, the Allen-Bradley 1756-L65 ControlLogix controller delivers. This Series B processor, manufactured by Rockwell Automation, is engineered for high-performance automation in demanding industrial environments. With 32 MB of user memory for both data and logic, plus 478 KB of I/O memory, the 1756-L65 handles complex control tasks with ease.
The 1756-L65 features an inbuilt RS-232 serial port and supports an optional nonvolatile memory storage via the 1756-CF128 128 MB CompactFlash card. It is powered by a replaceable 1756-BA2 lithium battery, ensuring reliable operation. Designed for scalability, this controller is compatible with several ControlLogix chassis, including the 1756-A7, 1756-A4, 1756-A17, 1756-A13, and 1756-A10.
Technical Specifications
The Allen-Bradley 1756-L65 offers a comprehensive set of specifications that enable it to manage extensive I/O and communication requirements. Below are the key parameters:
| Specification |
Value |
| Series |
ControlLogix |
| Module Type |
Processor Module |
| User Memory |
32 MB |
| I/O Memory |
478 KB |
| Maximum Total I/O |
128,000 |
| Maximum Analog I/O |
4,000 |
| Maximum Digital I/O |
128,000 |
| Current Draw (5.1V DC) |
1200 mA |
| Current Draw (24V DC) |
14 mA |
| Power Dissipation |
3.5 W |
| Thermal Dissipation |
11.9 BTU/hr |
| Isolation Voltage |
30V Continuous |
| Enclosure |
None |
The 1756-L65 operates within a temperature range of 0 to 60 °C and can be stored at -40 to 85 °C. It withstands 30 g operating shock, 50 g non-operating shock, and 2 g vibration at 10 to 500 Hz. The non-condensing relative humidity range is 5% to 95%.
Performance and Capabilities
With a maximum analog I/O of 4,000 and a maximum digital I/O of 128,000, the 1756-L65 accommodates large-scale automation projects. It supports up to 250 controller connections, making it ideal for distributed control architectures. The controller offers three main task types: 32 tasks, 100 programs per task, and event tasks with all event triggers, providing flexibility in programming and execution.
The 1756-L65 supports a wide range of communication protocols, including ControlNet, DeviceNet, Data Highway Plus, EtherNet/IP, SynchLink, Remote I/O, and third-party process and device networks. Serial communication options include DF1 radio modem, ASCII, DF1 full/half-duplex, DH-485, and Modbus via logic. This versatility ensures seamless integration into existing industrial networks.
Installation and Integration
Installing the 1756-L65 is straightforward. Mount it in a compatible ControlLogix chassis (e.g., 1756-A4, 1756-A7, 1756-A10, 1756-A13, or 1756-A17). Ensure proper grounding and follow the manufacturer's guidelines for power connections. The controller requires 5.1V DC and 24V DC supplies; verify your power budget matches the current draws of 1200 mA and 14 mA, respectively.
For memory expansion, you can insert the 1756-CF128 CompactFlash card into the controller's slot. The 1756-BA2 battery is replaceable and should be installed securely. When configuring communication, select the appropriate modules and set the network parameters to match your existing infrastructure.
Maintenance and Reliability
Regular maintenance ensures the 1756-L65 operates reliably over its service life. Check the battery status periodically and replace the 1756-BA2 lithium battery when the low-battery indicator activates. Keep the controller clean and free from dust, and ensure the ambient temperature stays within the 0 to 60 °C operating range. The 1756-L65 is designed for long-term use, and its type-tested 720V DC isolation for 60 seconds adds an extra layer of protection.
Selection Guide
When selecting the 1756-L65 for your application, verify compatibility with your existing ControlLogix chassis and communication modules. Consider the memory and I/O requirements of your project to ensure the 32 MB user memory and 478 KB I/O memory are sufficient. For reliable sourcing, PLC Source PRO offers genuine Allen-Bradley parts with fast shipping and competitive pricing.