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Allen-Bradley 1785-L20B PLC-5 Processor

1. Product Description

The 1785-L20B is an enhanced Ethernet PLC-5 programmable controller from Allen-Bradley’s PLC-5 series, designed for industrial automation. It features 16K words of user memory and supports Ethernet, DH+, and remote I/O communications, making it suitable for complex control systems in manufacturing, process control, and infrastructure applications .

2. Key Features

High-Speed Processing – Uses an Intel 80286 processor (16MHz) for efficient logic execution .
Flexible I/O Capacity – Supports up to 2,048 I/O points (with expansion modules) .
Multiple Communication Options – Includes:
- Ethernet for network connectivity.
- DH+ (Data Highway Plus) for PLC-to-PLC communication.
- Remote I/O scanning for distributed control .
Advanced Programming Support – Compatible with RSLogix 5/500 software, supporting:
- Ladder logic (LD).
- Structured text (ST).
- PID control algorithms .
Robust Industrial Design – Operates in 0°C to 60°C environments with IP20 protection (requires an enclosure for harsh conditions) .

3. Technical Specifications

Parameter	Specification
Processor	Intel 80286 (16MHz)
Memory	16K user memory (expandable to 1MB)
I/O Capacity	Up to 2,048 points (with expansion)
Communication Ports	Ethernet, DH+, RS-232, Remote I/O
Power Supply	120–480V AC (via 1771-P7 module)
Certifications	CE, UL, CSA, GOST

4. Applications

Manufacturing Automation – Assembly lines, robotic control .
Process Industries – Chemical batch processing, HVAC systems .
Infrastructure – Water treatment plants, power distribution .

5. Installation & Precautions

Compatibility Check – Ensure proper I/O module alignment (e.g., 1771 series chassis) .
Network Configuration – Verify DH+ node addresses to avoid conflicts .
Battery Maintenance – Replace the backup battery (1770-XYC) when the BATT LED indicates low voltage .