Product Details
Product Overview
The 1785-L80B is a high-performance, enhanced processor within the Allen-Bradley PLC-5 platform. Designed for large-scale industrial control, the 1785-L80B features a robust memory capacity of 100,000 words and supports extensive I/O configurations. This processor is particularly noted for its versatility in communication, offering multiple Data Highway Plus (DH+) and Remote I/O (RIO) ports, making it a cornerstone for legacy system migrations and complex standalone automation cells.
Technical Specifications
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Manufacturer Allen-Bradley / Rockwell Automation
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Product Series PLC-5 Enhanced
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Model Number 1785-L80B
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Processor Variant PLC-5/80
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User Memory Capacity 100 Kilowords (100K)
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Standard Memory Type Battery-backed Static RAM
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Non-Volatile Backup Compatible with 1785-ME16, -ME32, -ME64, and -M100 EEPROM modules
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Maximum I/O Capacity 3,072 total (any mix of inputs and outputs)
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Maximum Analog I/O 3,072 points
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Universal Remote I/O Racks 32 Max per I/O link
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Total I/O Chassis Support 93
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Communication Ports Four (4) DH+/RIO (Scanner or Adapter), One (1) Serial port (RS-232, RS-423, RS-422A)
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Supported Protocols DH+, RIO, DF1, and ASCII
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Backplane Current (5V DC) 2.3 Amperes
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Power Dissipation 12 Watts
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Redundancy Support Fully compatible with PLC-5 backup hardware
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Weight 3.00 lbs (1.36 kg)
Performance and Network Timing
The 1785-L80B provides high-speed data processing across its remote I/O links. The scan time per rack is highly dependent on the communication baud rate configured:
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57.6 kbits/s: 10 ms per rack
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115.2 kbits/s: 7 ms per rack
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230.4 kbits/s: 3 ms per rack
This deterministic performance allows engineers to tune the network for specific application requirements, balancing distance against speed.
Installation and Maintenance
The 1785-L80B is a modular component that installs into the leftmost slot (Slot 0) of a 1771 Universal I/O chassis.
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Battery Replacement: Uses the 1770-XYC lithium battery. It is recommended to replace the battery while the processor is powered to avoid data loss in the Static RAM.
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Memory Expansion: For applications requiring additional storage or dedicated backup, the processor supports the 1785-ME series of memory expansion modules.
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Environment: Designed for standard industrial environments with an operating temperature range of 0–60°C (32–140°F).
Frequently Asked Questions
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Can the 1785-L80B be used in a remote I/O chassis as an adapter?
Yes, the ports are configurable. The processor can act as a Scanner to control local I/O or as an Adapter to communicate with a supervisory controller on a DH+ or RIO network.
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Is the memory protected against unauthorized edits?
No, the 1785-L80B does not feature "Protected Memory" hardware locks. Security is typically managed through software permissions in RSLogix 5 or via physical keyswitch positions.
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What is the difference between the 1785-L80B and the standard 1785-L40B?
The 1785-L80B provides significantly higher memory (100K vs 48K) and double the I/O capacity (3072 vs 2048), making it suitable for much larger system architectures.
Additional Information
- 100% Genuine Parts: All products are original and authentic, ensuring reliable industrial performance.
- 30-Day Refund Guarantee: Return any in-stock item within 30 days in original, unopened packaging for a full refund (excluding shipping and fees).
- 12-Month Warranty: Covers defects in materials or workmanship; excludes misuse, normal wear, or unauthorized modifications.
- Worldwide Shipping: We ship via USPS, UPS, FedEx, and DHL. Delivery times vary by country and may be subject to customs or import fees.
- Support & Contact: Technical and warranty assistance is available anytime. Contact us here: Contact.
- Purchase Guidance: Check product specifications and compatibility carefully before ordering to ensure proper application.
Tech & Buying Guide
Evolving SCADA System Architectures in Industrial Automation
A robust Supervisory Control and Data Acquisition (SCADA) system serves as the heartbeat of modern industrial operations. Understanding SCADA system architecture is vital for engineers designing efficient control systems. These architectures have evolved from isolated, monolithic structures to highly interconnected, networked ecosystems. Choosing the right design requires balancing data visibility, processing power, and long-term scalability requirements.
Choosing the Right Controller: PLC vs. Motion Controller in Industrial Automation
Selecting the optimal control architecture is a foundational decision in industrial automation. Engineers must frequently choose between a Programmable Logic Controller (PLC) and a dedicated Motion Controller. While both systems manage machinery, their underlying design philosophies differ significantly, impacting performance, scalability, and system integration.
Mastering PLC Power Supply Architectures and Operating Voltages
Selecting the correct operating voltage is a critical step in designing reliable industrial automation systems. Whether you are working with a compact PLC or a large-scale DCS, your power architecture dictates the system's longevity. In this guide, we explore the standard voltage ranges and power distribution strategies required to maintain stable factory automation operations.