1756-L55M23 Product datasheet    

1756-L55M23 Functional Description    

The Allen-Bradley 1756-L55M23 is a high-performance controller from the ControlLogix series within the Logix5000 family. This controller is equipped with 1.5 KB of data and logic memory, 208 KB of I/O memory, and integrated non-volatile backup memory, ensuring reliable performance and data retention even during power loss.

One of the key features of the 1756-L55M23 is its dual-CPU architecture. The Logix CPU handles application code and message execution, while the backplane CPU is responsible for managing data flow across the backplane and communication with I/O devices. The controller supports multiple communication protocols, including Ethernet/IP, ControlNet, and DeviceNet, enabling seamless integration with other devices and controllers in the system.

For data sharing, the PLC Processor Module 1756-L55M23 can produce and consume system-shared tags over networks like EtherNet/IP or ControlNet. It also offers a multitasking feature, allowing it to allocate processing time to different operations in a given application. This ensures more efficient use of resources and better performance in complex automation tasks.

The 1756-L55M23 ControlLogix Controller and Memory Board includes built-in fault diagnostics and a fault handler, making it easier to troubleshoot and maintain. It also provides visual indicators like an I/O LED to alert users of any I/O communication issues, flashing green in case of a failure. For backup, the controller supports the 1756-BA1 or 1756-BATM battery, which requires regular maintenance to ensure uninterrupted operation.

In conclusion, the 1756-L55M23 Series A ControlLogix 5555 controller is a powerful and versatile controller designed to meet the demands of modern automation applications, offering robust communication options, multitasking capabilities, and reliable fault detection.