Description

The Allen-Bradley 1785-L20C is a high-performance, legacy industrial Programmable Logic Controller processor module belonging to the PLC-5/20C series. Slotted into the leftmost position of a standard 1771 Universal I/O chassis, this processor serves as the central processing unit orchestrating control routines. It is distinctively characterized by its embedded ControlNet communication interface, enabling deterministic, high-speed scheduled and unscheduled messaging across the plant floor. The module is designed with 16K words of internal RAM memory, supports battery backup, and includes real-time diagnostics via front-panel LED indicators. It handles overall program execution, sophisticated math computations, and distributed device tracking for medium-sized automation systems.

Product info

(1) Memory Capacity Parameters: Built with 16K words of battery-backed internal volatile memory.

(2) Total I/O Support: Manages up to 512 total inputs and outputs (any mix) or 512 complementary analog I/O points.

(3) Execution Performance Speed: Features a fast program scan time of 0.5 ms per Kword for bit logic, and 2.0 ms per Kword for typical mixed logic.

(4) Auxiliary Terminal Interface: Includes one dedicated 25-pin D-shell serial port supporting standard RS-232-C, RS-422-A, and RS-423-A serial lines.

(5) Backplane Current Load Consumption: Consumes an operational current profile of exactly 2.5Amps  maximum at a stable +5.0V DC circuit.

(6) Programming Software Workspace: Configured and engineered using Rockwell RSLogix 5 software matching corresponding firmware revisions.

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