Allen-Bradley 1785-L80C PLC-5/80C ControlNet Processor Module

Product Overview

The Allen-Bradley 1785-L80C is a ControlNet programmable controller from the PLC-5 series, designed for demanding industrial automation environments. As a PLC-5/80C processor module, it provides 100 Kilowords of user memory and supports a maximum total I/O of 3072 points (any mix) or 3072 in plus 3072 out in complementary mode. This module is engineered to exchange data efficiently with I/O devices such as variable speed drives, I/O racks, and HMI devices over the ControlNet network.

Technical Specifications Breakdown

Key parameters for the 1785-L80C are listed below for quick reference:

Industry Applications

In manufacturing lines, it coordinates multiple 1771 I/O racks via ControlNet, reducing wiring and improving data throughput. For material handling systems, the 1785-L80C manages high-speed sorting with its fast I/O scan times—down to 3 ms per rack at 230.4 kbits/s. In process industries, it integrates analog I/O for monitoring temperatures and pressures, leveraging its 3072 analog I/O capacity.

Installation & Setup Guidance

Mount the 1785-L80C in a 1771 I/O chassis, ensuring proper backplane seating. The module draws 3.3A at 5V DC from the backplane. Connect the ControlNet network via the RJ-45 NAP port using a standard cable; the network supports up to 99 nodes with a repeater. For memory backup, install a battery module (1770-XYC) and optionally a battery-backed memory module (1785-ME32, -ME64, or -M100). Set the I/O addressing mode (2-slot, 1-slot, or ½-slot) to match your chassis configuration.

Maintenance & Reliability

The controller operates reliably in environments with 5-95% relative humidity (non-condensing) and is IEC-tested to withstand 2G vibration at 10-500 Hz and 30G shock. Periodically inspect the battery light indicator; a lit light signals the need for battery replacement to maintain memory backup. Keep the enclosure clean and ensure adequate airflow to manage the 59 BTU/hour heat dissipation.

Compatibility & Integration

The 1785-L80C is compatible with 1771 intelligent, 8-, 16-, and 32-point I/O modules. It supports DH+ and remote I/O networks at transmission rates of 57.6, 115.2, and 230.4 kbits/s. For extended local I/O, note that the maximum extended local chassis is 0, while universal remote chassis can reach 32 per I/O link. The ControlNet hot backup cartridge (1785-CHBM) enables redundancy for critical processes.

Selection Guide & Purchasing Advice

When selecting the 1785-L80C, verify your system's I/O count and network topology to ensure compatibility. AutoDCSTech stocks this module and can help with lifecycle status and availability. Please verify current lifecycle status and availability with AutoDCSTech before ordering.