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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.
| 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 |
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.
Ships within 48 hours · Estimated delivery Jul 14 - Jul 19
US$40
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