Description

The Allen-Bradley 1785-L40E is a high-performance legacy programmable logic controller processor belonging to the PLC-5/40E 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 large-scale, complex plant-floor control operations. The defining characteristic of this specific variant is its integrated Ethernet communication interface, which enables direct connectivity to plant-wide networks and supervisory control systems without needing external network bridges. Equipped with 64K words of internal SRAM user memory, it supports extensive user programs, large data tables, and sophisticated data-processing routines. The module functions as a heavy-duty automation anchor, coordinating high-speed messaging across multiple networks, executing scheduled remote I/O scans, and allowing engineers to perform online logic modifications directly over a local area network (LAN).

Product info

(1) Memory Capacity Parameters: Built with 64K words (128 Kbytes) of battery-backed internal volatile SRAM memory.

(2) Total I/O Support: Manages a maximum capacity of 2,048 total inputs and outputs (or 2,048 complementary analog I/O points) across distributed remote I/O links.

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

(4) 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 to accept standard RJ45 cabling).

(5) 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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