The Allen-Bradley 1785-LT3 is a PLC-5 Classic processor featuring 6K words of memory and 512 I/O points. It includes DH+ and Remote I/O ports, offering reliable control and communication for legacy 1771 industrial automation systems.
The Allen-Bradley 1785-LT3 belongs to the trusted PLC-5 Classic controller family. This module manages complex automation tasks with 6,000 words of dedicated memory. It provides a reliable architecture for older industrial systems requiring consistent logic execution. Furthermore, the processor supports a total of 512 I/O points for diverse field device connectivity. This hardware excels in established manufacturing environments where stability remains the primary goal. Consequently, it serves as a critical component for maintaining legacy control infrastructures.
This processor module features a built-in Data Highway Plus (DH+) port for peer-to-peer messaging. It allows engineers to perform remote programming and data acquisition across the plant floor. Additionally, the DH+ link supports up to 64 unique station addresses for large-scale networking. The module also includes a Remote I/O (RIO) adapter port for distributed hardware configurations. This port facilitates high-speed communication at 57.6 kbps with remote chassis. Thus, the 1785-LT3 ensures efficient data exchange between controllers and supervision computers.
The 1785-LT3 supports Sequential Function Chart (SFC) programming for organized logical flow. This feature helps users develop and test complex batching or sequencing operations. Moreover, the integrated expansion port allows for additional coprocessor modules to enhance calculation speeds. The unit provides specialized instructions to simplify mathematical functions and data handling. Once engineers finalize the code, the processor executes instructions with high precision. This capability ensures the system meets strict industrial timing and safety requirements.
Allen-Bradley designed the 1785-LT3 to withstand harsh factory floor conditions. It maintains peak performance within a standard industrial temperature range of 60°C. Furthermore, the solid-state design minimizes failure points during continuous 24/7 operation. The module installs easily into a standard 1771 I/O chassis slot. Proper thermal management prevents damage to the sensitive internal electronic components. Therefore, this processor remains a durable solution for demanding heavy-industry applications worldwide.
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