Allen-Bradley 1785-L46B PLC-5/46 Enhanced Programmable Controller

Core System Specifications

• Manufacturer: Rockwell Automation / Allen-Bradley
• Model Number: 1785-L46B
• Processor Type: PLC-5/46 Enhanced with Protected Memory
• User Memory: 48K Words Protected Capacity
• I/O Capacity: 2048 Total or 2048 Input + 2048 Output
• Analog I/O: 2048 Channels Maximum
• Backplane Current: 3.0A @ 5V DC
• Power Dissipation: 17.3 Watts Maximum

Advanced Communication Capabilities

• Four DH+/Remote I/O Ports (Adapter or Scanner Mode)
• Serial Communication Port: RS-232/422/423 Compatible
• 9-pin D-shell Connector for DF1 Protocol Support
• Electrical Isolation: 500V-1000V Between Communication Ports
• All Ports Support Simultaneous Multi-Protocol Operation
• Real-time Network Diagnostics and Status Monitoring

Performance & System Architecture

• Maximum I/O Chassis: 61 Total (60 Universal Remote)
• Program Scan Time: 0.5 ms per K Word for Bit Logic Operations
• I/O Scan Times: 3ms at 230.4 kbps, 7ms at 115.2 kbps, 10ms at 57.6 kbps
• Memory Protection: Integrated Security for Program and Data
• Hardware Addressing: 2-slot, 1-slot, and 1/2-slot Modes
• Control Coprocessor: Expansion Port for Enhanced Functions

Environmental & Operational Ratings

• Operating Temperature: 0°C to 60°C (32°F to 140°F)
• Storage Temperature: -40°C to 85°C (-40°F to 185°F)
• Relative Humidity: 5% to 95% Non-Condensing
• Real-time Clock Accuracy: ±5 Minutes per Month
• Shock Resistance: 30G Operational, 50G Non-Operational
• Vibration Tolerance: 1G @ 10-500 Hz Frequency Range

Installation & Configuration

• Install the 1785-L46B in left-most slot of 1771-A1B, A2B, A3B, A3B1, A4B chassis
• Configure memory protection settings for secure program operation
• Set hardware addressing mode based on I/O module density requirements
• Utilize battery-backed memory modules for critical data retention
• Implement proper grounding and electrical isolation for communication ports
• Monitor thermal dissipation and ensure adequate chassis ventilation

Compatibility & Expansion

• I/O System Compatibility: 1771, 1794, 1746, and 1791 I/O Families
• Module Support: 8-point, 16-point, 32-point, and Intelligent I/O Modules
• Memory Expansion: 1785-ME32, ME64, M100 Battery-Backed Modules
• Battery System: 1770-XYC with Advanced Power Management
• Control Network: DH+ and Remote I/O for Distributed Control Systems
• Certifications: UL, CSA, C-TICK, CE Industrial Standards Compliance

Packaging & Shipping Information

• Your order includes one genuine Allen-Bradley 1785-L46B processor unit
• We include comprehensive installation guides and programming documentation
• We ship worldwide via express carriers including FedEx, UPS, and DHL
• You receive complete tracking information and delivery status updates

Frequently Asked Questions (FAQ)

• What does "protected memory" mean for this controller?
• Protected memory limits access to critical program data and configuration, preventing unauthorized changes to control logic.
• How many remote I/O chassis can connect to each communication link?
• Each Remote I/O link supports up to 32 chassis, with the controller managing 60 total remote chassis.
• What is the advantage of the multiple hardware addressing modes?
• Different addressing modes optimize I/O configuration for various module densities and system requirements.
• Can this controller communicate with different I/O families simultaneously?
• Yes, it supports 1771, 1794, 1746, and 1791 I/O systems in the same control architecture.
• What is the purpose of the electrical isolation between communication ports?
• Isolation prevents ground loops and electrical noise interference, ensuring reliable network communication.

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