The Allen-Bradley 1785-L20E is an enhanced PLC-5/20E processor featuring 16K memory and integrated Ethernet communication. It supports up to 512 I/O points, providing a reliable and scalable control solution for 1771-chassis industrial systems.
The Allen-Bradley 1785-L20E belongs to the renowned PLC-5 family, functioning as a high-performance central processing unit for medium-scale industrial control. This single-slot module installs directly into 1771-A1B through 1771-A4B chassis systems, where it manages complex automation tasks with precision. Because it integrates an onboard Ethernet port, this controller enables high-speed data exchange and seamless connectivity across plant-wide networks. Consequently, engineers utilize the 1785-L20E to bridge the gap between legacy Data Highway Plus (DH+) architectures and modern industrial Ethernet environments.
The 1785-L20E features 16,000 words of volatile SRAM memory, which maintains critical logic data via a 1785-XYC lithium battery during power interruptions. To further safeguard operational uptime, the system supports various non-volatile EEPROM modules ranging from 16K to 100K words. Furthermore, the processor manages an expansive I/O image of up to 512 points. This capacity allows the module to orchestrate a local chassis along with up to twelve remote I/O racks. By utilizing fast scan times—reaching 3 milliseconds at 230.4 kbps—the controller ensures rapid response for high-speed manufacturing applications.
Connectivity remains a core strength of the 1785-L20E. The module provides a comprehensive suite of ports to facilitate multi-layered communication:
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