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Allen Bradley PLC 5 1785-LT3

Product image is representative; revision or series may vary. Contact us to request a specific version.

1785-LT3

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The 1785-LT3 processor module is a PLC 5 series classic processor module that has been manufactured by Allen-Bradley. Its maximum user memory capacity is 6K words. The 1785-LT3 processor module also supports an EEPROM module with a maximum capacity of 8K words. It can handle up to 256 analog I/O at a time. The 1785-LT3 processor module has a typical program scan time per 1000 words of 8 milliseconds.

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Rockwell Disclaimer: The product is used surplus. DO Supply is not an authorized surplus dealer or affiliate for the Manufacturer of this product. The product may have older date codes or be an older series than that available direct from the factory or authorized dealers. Because DO Supply is not an authorized distributor of this product, the Original Manufacturer's warranty does not apply. While many Allen-Bradley PLC products will have firmware already installed, DO Supply makes no representation as to whether a PLC product will or will not have firmware and, if it does have firmware, whether the firmware is the revision level that you need for your application. DO Supply also makes no representations as to your ability or right to download or otherwise obtain firmware for the product from Rockwell, its distributors, or any other source. DO Supply also makes no representations as to your right to install any such firmware on the product. DO Supply will not obtain or supply firmware on your behalf. It is your obligation to comply with the terms of any End-User License Agreement or similar document related to obtaining or installing firmware.

Technical specifications for 1785-LT3

ManufacturerAllen Bradley
CategoryPLCs
Product LinePLC 5
Part Number1785-LT3
Weight3.19 lbs (1.45 kg)
Module TypeProcessor
Max Total I/O512
Analog I/O256
DH+ ChannelYes
Remote I/O ChannelYes
Number of Words6 Kilowords SRAM
Backplane Requirement2.5 Amperes at 5 Volts DC
Max Analog I/O3072
I/O Scan Time Per Rack10 ms at 57.6 kbits/s, 7 ms at 115.2 kbits/s, 3 ms at 230.4 mbits/s
Max I/O Chassis Total93
Max I/O Chassis Extended Local0
Max I/O Chassis Universal Remote32 Max. Per I/O Link
RS-232-C/422-A/423- A Ports1
Control Coprocessor Expansion PortYes

The Allen-Bradley 1785-LT3 has 512 I/O. This module comes with a DH+ Channel and a Remote I/O Channel (Adapter Only). The DH+ connection supports remote programming and information access. DH+ links can be used for data transfer to higher level computers and as PLC-5 programming processors. This module can communicate via DH+ links with other processors and with the programming terminal. this module can also connect a maximum of 64 stations to the DH+ link. The operating temperature of the 1785-LT3 module is 0-60 °C (32-140 °F). The nonoperating temperature of this module is -40-85 °C (-40-185 °F). If you keep this module in an area that has a temperature above or below those temperatures, it will cause damage to the module. The 1785-LT3 module has a memory of 6K words. The backplane current of this module is 2.5 A at 5V DC. This module has a Control Coprocessor Expansion Port. This module offers a control strategy. This module has hardware selection, layout, and addressing features. The remote I/O transmission rates of this module are 57.6 kbps. The 1785-LT3 comes with a sequential function chart (SFC) and special programming features. In using this module, you can also develop your program, enter your program, and test it. When testing is complete, you can apply the program in your app. Detailed analysis can be used as a basis for developing your test procedures and requirements. Because the functional specifications of this module are advanced, the 1785-LT3 can be used as a document sign-off program.

Revision Part #Also known as
1785-LT3 Ser A1785-LT3/A, Series A, Rev A
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