The Allen-Bradley 1785-LT PLC is a robust member of the classic PLC 5 family, offering reliable performance and versatile connectivity options. This PLC 5/15 processor supports up to four local racks, with one as the resident rack, and accommodates up to three Remote I/O racks managing up to twelve devices. It is well-equipped with a Scanner port for local and RIO connections, alongside a Data Highway Plus (DH+) port that facilitates integration with diverse devices such as HMIs, SCADA systems, and co-processors, supporting both Allen-Bradley and third-party products. The 1785-LT integrates a standard 6KWords of memory, expandable up to 14KWords, and supports optional memory modules, including the 4K and 8K RAM expansions. Its ability to manage up to 512 I/O combinations makes it suitable for complex automation tasks. The controller operates seamlessly within a temperature range of 0-60 °C, withstanding rigorous industrial conditions, and complies with EN 50081-2 EMC standards, ensuring reliable, interference-free operation in diverse environments.
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Technical specifications for 1785-LT
| Manufacturer | Rockwell Automation |
|---|---|
| Part Number/Catalog No. | 1785-LT |
| Brand | Allen-Bradley |
| Product Description: | PLC5 Classic Programmable Controller |
| 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 I/O; 512 inputs and 512 outputs using 16 or 32-pt modules |
| Embedded RAM: | 6K Words; expandable up to 14K Words |
| Memory modules: | 4K RAM expansion, 1785-MR; 8 K RAM expansion, 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 (1) standalone scanner (local and remote I/O) adapter; One (1) DH+ |
| Hardware addressing: | 2-slot; 1-slot; ½ slot |
| Location | 1771-I/O chassis, left-most slot |
| Keying | between 40 and 42; between 54 and 56 |
| Module Type | Processor |
| Max Total I/O | 3072 (any mix) or 3072 in + 3072 out (complementary) |
| Analog I/O | 512 |
| DH+ Channel | Yes |
| Remote I/O Channel | Yes |
| Number of Words | 6 Kilowords SRAM (expands to 14 Kilowords) |
| Max Analog I/O | 3072 |
| 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 mbits/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 |
| Control Coprocessor Expansion Port | Yes |
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