Description

The Allen-Bradley 1785-L80B is an Enhanced PLC-5 programmable controller designed for high-speed sequential and regulatory control applications. This single-slot module occupies the left-most slot in a 1771 universal I/O chassis and functions as the core processing unit for large-scale industrial operations. The device features 100K words of maximum user memory and supports up to 3072 total I/O maximum channels, or 3072 inputs and 3072 outputs in a complementary configuration. It provides four communication channels configurable for Data Highway Plus (DH+) or Universal Remote I/O (Adapter or Scan modes), along with a dedicated front-panel serial port configurable for RS-232, RS-422, or RS-423A protocols. The processor is utilized across diverse industrial applications, including automotive manufacturing, chemical processing, material handling, SCADA systems, and petroleum applications.

Features

• Configurable communication ports for DH+ or Universal Remote I/O (4 channels)
• Dedicated serial port supporting RS-232, RS-422, and RS-423A communication
• Large memory capacity with 100K words of maximum user memory
• Advanced instruction set including relay-type, timer/counter, compare, compute, and logical instructions
• Support for multiple main control programs and specialized interrupts (processor input and selectable timed)
• System dependability with an open architecture that allows automated system expansion
• Hot backup support using the 1785-CHBM ControlNet Hot Backup Cartridge

Applications

• Automotive manufacturing powertrain and paint shop networks
• Chemical processing and petroleum batch or continuous systems
• Baggage, cargo, and bulk material handling systems
• Water and wastewater treatment SCADA remote communications
• Brewing fermentation and finishing area process integration

Technical Specifications

Installation Guidelines

• Install the processor exclusively in the left-most slot of a compatible 1771 I/O chassis (such as the 1771-A1B, 1771-A2B, 1771-A3B, or 1771-A4B).
• Ensure proper chassis grounding and shielding practices are maintained in accordance with the Industrial Automation Wiring and Grounding Guidelines (publication 1770-4.1).
• Maintain clear spaces around the chassis to facilitate sufficient cooling and ventilation within the industrial enclosure.
• Route serial, DH+, and Remote I/O cables away from high-voltage motor lines to mitigate EMI/RFI noise interference.
• For remote communication cabling, utilize standard Wire Category 2 cables for serial and DH+ links, and Wire Category 1 cables for relay connections.

Compliance and Certifications

• UL Listed Industrial Control Equipment
• CSA Certified Process Control Equipment for Class I, Division 2 Group A, B, C, D Hazardous Locations
• European Union 89/336/EEC EMC Directive (compliant with EN 50081-2 Industrial Emissions and EN 50082-2 Industrial Immunity)
• European Union 73/23/EEC LVD Directive (compliant with EN 61131-2 Programmable Controllers)
• C-Tick (Australian Radiocommunications Act compliant with AS/NZS 2064 Industrial Emissions)
• Certified for Marine and Off-Shore Applications by Lloyd's Register, American Bureau of Shipping, Det Norske Veritas, Bureau Veritas, and Registro Italiano Navale