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
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