1769-L20 Allen-Bradley CompactLogix Processor Module

Product Overview

The 1769-L20 is an entry-level CompactLogix controller designed for standalone machine control and small-scale automation tasks. It provides a reliable solution for applications that do not require Ethernet connectivity, instead utilizing a dedicated RS-232 serial port for communication and programming. The controller supports modular I/O expansion, allowing a customized hardware footprint, and can be mounted on either a standard DIN rail or a flat panel.

Technical Specifications

Hardware Installation and Mounting

The 1769-L20 is designed for industrial environments and should be installed in a clean, dry location. When configuring the system, ensure that the power supply distance rating is observed for all eight supported I/O modules. The controller features integrated locking tabs for secure DIN rail mounting; however, panel mounting is recommended in applications with higher vibration or shock requirements, where a rating of up to 30 g is supported.

Common Technical Questions

Can the 1769-L20 be used on an Ethernet network?
No. The 1769-L20 does not include a native Ethernet (RJ45) port. Communication is limited to RS-232 serial. Ethernet connectivity would require an external serial-to-Ethernet gateway or upgrading to a CompactLogix L23E or L3xER series controller.

What is the purpose of the 1747-BA battery?
The 1747-BA battery maintains power to volatile memory, ensuring retention of the user program and tag data during a power loss. Periodic replacement is recommended to avoid data loss.