Product Overview

The Allen-Bradley 1785-L80C is a high-capacity central processing unit belonging to the PLC-5/80C controller family. Engineered for large-scale industrial operations, this processor is distinguished by its integrated ControlNet communication port, which facilitates high-speed, deterministic data transfer and peer-to-peer interlocking. With a substantial 100K word memory capacity, the 1785-L80C is capable of managing complex control algorithms and extensive data logging across broad automated systems.

Designed to reside in a 1771 I/O chassis, the 1785-L80C provides a bridge between legacy I/O infrastructure and modern high-speed networking. It is particularly suited for process control applications requiring high I/O density and rapid execution of sophisticated logic programs.

Technical Specifications

• Processor Type: PLC-5/80C ControlNet Controller

• User Memory: 100,000 (100K) Words

• Total I/O Capacity: Up to 3,072 Maximum (Any combination of Input and Output)

• Network Ports: ControlNet (1.5 Mbps), Data Highway Plus (DH+), and Remote I/O (Scanner or Adapter)

• Programming Port: RS-232-C / RS-422-A / RS-423-A

• Maximum Remote Racks: 125

• Typical Scan Time: 0.5 ms per K (Boolean logic)

• Backplane Current Draw: 3.3A @ 5V DC

• Operating Temperature: 0 to 60 °C (32 to 140 °F)

• Weight: 1.36 kg

• Dimensions: 4.8 x 16.5 x 26.8 cm

Key Technical Characteristics

• Deterministic Networking: The dedicated ControlNet interface ensures predictable data delivery and repeatability, which is critical for synchronized motion and time-sensitive process applications.

• Expanded Memory Management: The 100K word capacity allows for extensive program storage and complex data table mapping, reducing the need for multiple inter-linked processors.

• Multi-Protocol Communication: Beyond ControlNet, the unit supports DH+ and Universal Remote I/O, allowing for simultaneous connection to legacy RIO racks, HMIs, and peer controllers.

• System Scalability: Capable of addressing up to 3072 I/O points, the module supports 1-slot, 2-slot, and 1/2-slot I/O addressing modes to optimize chassis space.

• Industrial Hardening: Featuring high-vibration resistance and robust electromagnetic compatibility (EMC), the 1785-L80C is built for long-term reliability in demanding plant floor environments.