Allen-Bradley PLC-5: 1771/1785 Series

The PLC-5 system integrates processors (1785 series) with a variety of I/O modules (1771 series) to manage complex industrial processes. This modular architecture allows for tailored configurations to meet specific application requirements.

1771 Series I/O Modules

The 1771 Series includes versatile I/O modules for interfacing with field devices:

  • Digital I/O Modules: Examples include the 1771-IA16 (16-point AC input) and 1771-OA16 (16-point AC output), managing discrete signals for on/off device control with response times as low as 10 ms.

  • Analog I/O Modules: Modules like the 1771-IFM (8-channel input) and 1771-OFE (4-channel output) provide 16-bit resolution for precise control of variables such as temperature and pressure.

  • Specialty Modules: High-speed counters (e.g., 1771-HSCE) support frequencies up to 1 MHz, while communication adapters (e.g., 1771-KE) enable data exchange and network interfacing, enhancing system functionality.

1785 Series Processors

The 1785 Series offers processors with various memory capacities and communication options to suit different control needs:

  • Standard PLC-5 Processors: Provides essential control functions with up to 16K words of memory, ideal for general applications.

  • Enhanced PLC-5 Processors: Supports more demanding tasks with increased memory (up to 48K words) and faster processing, suitable for larger I/O counts and complex control.

  • Ethernet PLC-5 Processors: Integrated with Ethernet ports for seamless network integration, these processors offer up to 64K words of memory, enabling remote monitoring and communication across plant networks.

Technical Features

  • Modular Design: Facilitates scalable system configurations, allowing for easy expansion and customization.

  • Communication Flexibility: Supports various protocols, including Ethernet/IP, ControlNet, and Data Highway Plus (DH+), enabling integration with diverse industrial networks.

  • High Reliability: Engineered for durability in industrial environments, ensuring consistent performance and minimal downtime.

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