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Allen-Bradley 1785-LT PLC5 Classic Programmable ControllerProduct Overview The Allen Bradley 1785 LT is a PLC5 Classic Programmable Controller designed for high performance industrial automation. It supports both local and remote I O racks, providing flexible I O configurations. With embedded RAM and expandable memory modules, it ensures reliable processing for complex control applications. The controller includes DH+ communication and RS 232 422 423 ports for seamless integration. Technical Specifications
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Product Overview

The Allen-Bradley 1785-LT is a PLC5 Classic Programmable Controller designed for high-performance industrial automation. It supports both local and remote I/O racks, providing flexible I/O configurations. With embedded RAM and expandable memory modules, it ensures reliable processing for complex control applications. The controller includes DH+ communication and RS-232/422/423 ports for seamless integration.

Technical Specifications

Parameter Specification
Manufacturer / Brand Rockwell Automation / Allen-Bradley
Part Number / Catalog No. 1785-LT
Module Type Processor
Supported Local I/O Up to 4 Racks (1 resident rack)
Supported Remote I/O Up to 3 Remote I/O racks
I/O Capacity 512 inputs & 512 outputs using 16 or 32-pt modules
Embedded RAM 6K Words; expandable up to 14K Words
Memory Modules 4K RAM (1785-MR), 8K RAM (1785-MS), 8K EEPROM (1785-MJ)
Battery 1770-XY
Program Scan Time 2 ms/K words (bit logic); 8 ms/K words (typical)
Built-in Communication One standalone scanner (local & remote I/O), One DH+
Hardware Addressing 2-slot, 1-slot, ½ slot
Location in Chassis 1771-I/O chassis, left-most slot
Keying Between 40–42; 54–56
Max Total I/O 3072 (any mix) or 3072 in + 3072 out
Analog I/O 512 (Max 3072)
DH+ Channel Yes
Remote I/O Channel Yes
Number of Words 6 Kilowords SRAM (expands to 14 Kilowords)
I/O Scan Time per Rack 10 ms at 57.6 kbits/s, 7 ms at 115.2 kbits/s, 3 ms at 230.4 kbits/s
Max I/O Chassis Total 93
Max I/O Chassis Extended Local 0
Max I/O Chassis Universal Remote 32 Max per I/O Link
RS-232-C / 422-A / 423-A Ports 1

Key Features

  • High-performance PLC5 controller supporting complex industrial automation.

  • Flexible local and remote I/O support with up to 512 inputs and outputs.

  • Embedded 6K RAM expandable to 14K Words for large programs.

  • Fast program scan times: 2 ms per K words for bit logic.

  • Integrated DH+ and RS-232/422/423 ports for network communication.

  • Compatible with 1771-I/O chassis for easy installation and expansion.

  • Supports analog I/O, up to 3072 total channels, for versatile process control.

 

Allen-Bradley 1785-LT PLC5 Classic Programmable Controller

Item no : 90309810077
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US$ 160.00
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