Description

The Allen-Bradley 1785-L20E is a high-performance legacy programmable logic controller processor belonging to the PLC-5/20E architecture. It is designed to slide directly into the leftmost slot of an Allen-Bradley 1771 Universal I/O chassis to serve as the central processing brain for plant-floor control operations. The defining characteristic of this specific variant is its embedded Ethernet communication interface, which allows it to connect directly to standard office networks and factory-floor networks without needing external bridging modules. Equipped with 16K words of internal SRAM user memory, it supports extensive user programs, complex data tables, and advanced mathematical logic. The module functions as a versatile automation anchor for medium-sized systems, coordinating high-speed messaging, executing scheduled remote I/O scans, and allowing engineers to perform online logic modifications directly over a local area network (LAN).

Product info

(1) Chassis Layout Footprint: Slot-bound hardware designed to fit exclusively into the leftmost slot of any standard 1771 I/O chassis.

(2) Memory Capacity Parameters: Built with 16K words (32 Kbytes) of battery-backed internal volatile SRAM memory.

(3) Total I/O Support: Manages a maximum capacity of 512 total inputs and outputs across distributed remote I/O links.

(4) Maximum I/O Chassis Racks: Supports up to 4 logical or physical remote I/O racks.

(5) Execution Performance Speed: Features a fast program scan time of 0.5 milliseconds per Kword for bit logic execution.

(6) Onboard Ethernet Ports: Equipped with one 15-pin AUI transceiver port on the front panel (requires an external transceiver like the 10Base-T 1785-ENET for RJ45 connectivity).

(7) Serial Net Interfaces: Includes one 8-pin mini-DIN Data Highway Plus (DH+) programming channel and one dedicated Remote I/O (RIO) scanner/adapter port.

(8) Backplane Current Load Consumption: Consumes an operational current profile of exactly 3.7Amps maximum at a stable + 5.0V DC circuit.

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