Description

Brief Product Description

The Allen-Bradley 1785-LT3 is a high-performance PLC-5 processor designed for reliable control of up to 512 I/O points. It integrates Data Highway Plus (DH+) communication and dedicated Remote I/O support to facilitate seamless data exchange across industrial networks.

Product Description

Integrated Control and Communication Architecture

The Allen-Bradley 1785-LT3 serves as a core processing unit within the legacy PLC-5 platform, offering a robust solution for medium-scale industrial automation. This module manages up to 512 total I/O points, providing sufficient capacity for diverse factory floor operations. To enhance connectivity, the processor features an onboard DH+ (Data Highway Plus) port, which allows engineers to perform remote programming and high-speed messaging between multiple PLCs or supervisory computers. Furthermore, its Remote I/O channel functions in adapter mode, streamlining the integration of distributed I/O racks into a centralized control strategy.

Specialized Logic and Memory Management

With 6,000 words of dedicated user memory, the 1785-LT3 efficiently handles complex instruction sets and data logging requirements. The processor supports advanced programming structures, including Sequential Function Charts (SFC), which simplify the development of multi-step process logic. Because it includes a Control Coprocessor expansion port, the module can offload specialized computing tasks to maintain high logic execution speeds. This architecture ensures that the controller remains responsive even when managing intricate mathematical calculations or extensive communication throughput.

Industrial Durability and Environmental Specifications

Rockwell Automation designed the 1785-LT3 module for continuous operation in demanding plant environments. It maintains optimal functionality within a standard operating temperature range of 0 to 60°C (32 to 140°F). Moreover, the hardware requires 2.5 Amps of backplane current at 5V DC, necessitating a stable power supply configuration within the universal I/O chassis. The module’s physical design facilitates easy installation and replacement, while its status indicators provide immediate feedback during program validation and system testing phase. This reliability makes the 1785-LT3 a cornerstone for maintaining aging yet critical automation infrastructure.

Technical Specifications