Product Summary
The Allen-Bradley 1785-L80B enhanced PLC-5 controller delivers powerful, centralized control for complex industrial systems. It boasts 100 Kilowords of user memory and supports up to 3072 I/O points. With four versatile DH+/Remote I/O channels, this processor excels in large-scale automation networks.
Expert Technical Evaluation & Performance Review
The Core Processor and Its Memory Architecture
The 1785-L80B operates as a PLC-5/80 class processor, providing 100 Kilowords of battery-backed static RAM. This memory stores your critical control logic and data. You can expand this capacity using optional EEPROM memory modules like the 1785-ME64. The controller also supports redundancy for mission-critical applications.
Communication and Network Performance
This controller features four built-in communication channels. Each channel functions as a DH+ port or a Remote I/O scanner or adapter. This flexibility allows the 1785-L80B to manage up to 32 remote I/O racks. The I/O scan time per rack reaches just 3 ms at 230.4 kbits/s. This ensures fast and deterministic data exchange.
Real-World Application and Reliability
Engineers use this processor to connect a high number of remote devices. It simultaneously manages both RIO and DH+ networks for seamless integration. The front panel features clear status indicators for battery, processor mode, and communication activity. These lights enable quick diagnostics to reduce downtime during troubleshooting.
Product Procurement & Buyer Guide
System Scalability with the 1785-L80B
This processor supports a maximum of 93 I/O chassis in total. It can handle a mix of 3072 inputs and 3072 outputs. This high count makes it ideal for sprawling factory lines or material handling systems. You can deploy it with up to 32 universal remote chassis.
Key Specifications for Selection
The controller draws only 2.3 A from the backplane and dissipates 12 W of power. This low power consumption reduces heat buildup in your panel. For installation, use a compatible 1771-series chassis like the 1771-A4B. You must also select a supported power supply, such as the 1771-P4S1.
Multi-Protocol Connectivity Guide
The 1785-L80B includes one serial port for RS-232, RS-423, or RS-422A connections. This port supports DF1 and ASCII protocols for programming or printer communication. The four main channels use a three-pin connector for DH+ or RIO networks. Match the DH+ baud rate on all devices for reliable communication.
