Product Overview

• 1785-LT is a classic PLC-5/15 processor module in Allen Bradley PLC-5 series
• Installed in left-most slot of 1771 I/O chassis as main controller for small to medium automation systems
• Built with 6K words battery-backed SRAM, expandable to 14K via 1785-MR/MS memory modules
• Supports up to 256 mixed discrete/analog I/O points; max 4 local racks (1 resident + 3 expansion)
• Equipped with 1 DH+ port and 1 standalone RIO scanner port for dual-network communication

• Discontinued original model for legacy system maintenance, replacement and spare parts backup

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Core Features

• 6K words battery-backed SRAM (14K expandable) for program/data storage
• Supports 256 I/O points (any mix); max 4 local I/O racks
• 1 DH+ port (1Mbps) and 1 RIO scanner port for peer-to-peer communication
• Hardware addressing: 2-slot, 1-slot, ½ slot for flexible I/O configuration
• LED indicators for RUN, CPU, COMM status monitoring

• Compact design for cost-effective small-scale automation

Technical Parameters

• Brand: Allen Bradley Rockwell Automation
• Part Number: 1785-LT
• Series: PLC-5/15 Classic
• Type: Processor CPU Module
• User Memory: 6K Words SRAM (14K expandable)
• Max I/O Capacity: 256 Points
• Communication Ports: 1 DH+, 1 RIO Scanner
• Backplane Current: 1.2A @5VDC
• Power Consumption: 6W
• Operating Temperature: 0°C ~ 60°C
• Battery: 1770-XY
• Weight: 1.0kg
• Condition: Original Discontinued Refurbished

• Warranty: 12 Months

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Applications

• Small to medium PLC-5 automation system main control unit
• Manufacturing, packaging, material handling and light process control
• Legacy PLC-5 system upgrading and old equipment renovation

• Cost-effective projects with low I/O count requirements

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Our Advantages

• Fully tested and calibrated before delivery
• Sufficient stock fast global shipping
• Professional technical support for installation and programming
• Competitive bulk wholesale price available