1785-LT - In Stock | Allen Bradley PLC PLC 5

1785-LT

Rated 4.9 with 16 reviews

DO Supply is NOT an authorized distributor for this manufacturer and therefore the manufacturer’s warranty does not apply. Product comes with DO Supply's 1-year warranty

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.

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.


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1785-LT

Revisions: Ser A Ser B 
Description: The Allen-Bradley 1785-LT is a classic PLC5 controller module. This controller is a PLC 5/15 controller that features 512 I/O of any combination; 512 inputs and 512 outputs using any combination of 16-channel or 32-channel modules. It has a built-in 6 K memory that is expandable up to 14K Words. Up to 12 Remote I/O racks may be connected to this controller and maximum of 4 local racks. It has built-in standalone scanner (local and remote I/O) adapter and Data Highway + (DH+) ports.
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Request a quote for 1785-LT

Description: The Allen-Bradley 1785-LT is a classic PLC5 controller module. This controller is a PLC 5/15 controller that features 512 I/O of any combination; 512 inputs and 512 outputs using any combination of 16-channel or 32-channel modules. It has a built-in 6 K memory that is expandable up to 14K Words. Up to 12 Remote I/O racks may be connected to this controller and maximum of 4 local racks. It has built-in standalone scanner (local and remote I/O) adapter and Data Highway + (DH+) ports.

DO Supply is NOT an authorized distributor for this manufacturer and therefore the manufacturer’s warranty does not apply. Product comes with DO Supply's 1-year warranty

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.

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Revisions: Ser A Ser B 

Warranty: 1 year DO Supply Warranty Included
Shipping: Worldwide shipping via UPS, DHL, and TNT
Repairs: We offer repair service for the 1785-LT.
Exchange: Exchange credit for your defective unit available.
Conditions: We sell preowned surplus and refurbished parts.

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Rated 4.9 with 16 reviews

    Technical Specifications for 1785-LT

ManufacturerRockwell Automation
Location1771-I/O chassis, left-most slot
Program Scan time:2 ms/K words (bit logic); 8 ms/K words (typical)
Battery:1770-XY
Memory modules:4K RAM expansion, 1785-MR; 8 K RAM expansion, 1785-MS; 8K EEPROM,1785-MJ
Embedded RAM:6K Words; expandable up to 14K Words
I/O capacity:512 I/O; 512 inputs and 512 outputs using 16 or 32-pt modules
Supported Remote I/O:Up to 3 Remote I/O racks
Supported local I/O:Up to 4 Racks (1 resident rack)
Product Description:PLC5 Classic Programmable Controller
BrandAllen-Bradley
Built-in communication:One (1) standalone scanner (local and remote I/O) adapter; One (1) DH+
Hardware addressing:2-slot; 1-slot; ½ slot
Part Number/Catalog No.1785-LT
Keyingbetween 40 and 42; between 54 and 56
Module TypeProcessor
Max Total I/O512
Analog I/O512
DH+ ChannelYes
Remote I/O ChannelYes
Number of Words6 Kilowords SRAM (expands to 14 Kilowords)
Max Total I/O3072 (any mix) or 3072 in + 3072 out (complementary)
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
ManufacturerRockwell Automation
Location1771-I/O chassis, left-most slot
Program Scan time:2 ms/K words (bit logic); 8 ms/K words (typical)
Battery:1770-XY
Memory modules:4K RAM expansion, 1785-MR; 8 K RAM expansion, 1785-MS; 8K EEPROM,1785-MJ
Embedded RAM:6K Words; expandable up to 14K Words
I/O capacity:512 I/O; 512 inputs and 512 outputs using 16 or 32-pt modules
Supported Remote I/O:Up to 3 Remote I/O racks
Supported local I/O:Up to 4 Racks (1 resident rack)
Product Description:PLC5 Classic Programmable Controller
BrandAllen-Bradley
Built-in communication:One (1) standalone scanner (local and remote I/O) adapter; One (1) DH+
Hardware addressing:2-slot; 1-slot; ½ slot
Part Number/Catalog No.1785-LT
Keyingbetween 40 and 42; between 54 and 56
Module TypeProcessor
Max Total I/O512
Analog I/O512
DH+ ChannelYes
Remote I/O ChannelYes
Number of Words6 Kilowords SRAM (expands to 14 Kilowords)
Max Total I/O3072 (any mix) or 3072 in + 3072 out (complementary)
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
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About 1785-LT

The Allen-Bradley 1785-LT is a Programmable Logic Controller (PLC). This controller is specifically a PLC 5/15 processor that belongs to the larger family of classic PLC 5 controllers.

The 1785-LT features support for installation of up to Four (4) local racks with One (1) rack being the resident rack. For Remote I/O configuration, this processor supports up to Three (3) RIO racks wherein up to Twelve (12) physical devices are supported. It has built-in communication interfaces such as standalone Scanner port for implementing local and Remote I/O (RIO) connection. Additionally, it also has a Data Highway Plus (DH+) communication port which can be used simultaneously with the RIO port to connect to a variety of devices such as Human Machine Interface (HMI), Supervisory Control and Data Acquisition (SCADA) as well as co-processors in the network for messaging functionalities. These ports may also be used with 3rd party, non-Allen-Bradley devices.

The 1785-LT has an embedded memory amounting 6KWords which can be expanded up to 14K Words. It may also be installed with optional memory modules such as 4K RAM expansion with catalog number 1785-MR; 8 K RAM expansion with catalog number 1785-MS and 8K EEPROM with catalog number 1785-MJ.

With the equipped memory size, the 1785-LT is capable of handling up to 512 I/O of any combination or 512 inputs and 512 outputs in complimentary mode using any supported Sixteen (16) channel or Thirty-Two (32) channel I/O modules. 16-channel modules support 2-slot addressing while 1-slot addressing for 2-slot modules. IOIOIO I/O module configuration must be implemented as well to qualify the hardware configuration.

If you set the switch to the ON position, when communication errors are detected, the outputs that are connected to this chassis remain in their final state to allow the movement of the machine to continue. It is recommended that you set Switch 1 to the OFF position to remove the output energy that is connected to this chassis when any errors are detected. The maximum user memory words of this module are 6K words and this is expandable to 10K or 14K.

The operating temperature of the 1785-LT is 0-60 °C (32-140 °F). The storage temperature of this module is -40-85 °C (-40-185 °F). The relative operating and storage humidity is 5-95% without condensation. The Allen-Bradley 1785-LT has an operating shock of 30 g (3 pulses, 11 ms). The nonoperating shock is 50 g (3 pulses, 11 ms). This module has ESD immunity of 4 kV contact discharges. The Allen-Bradley 1785-LT also follows the Electromagnetic Compatibility (EMC) standards. The 1785-LT has also passed EN 50081-2 EMC - Generic Emission Standard for operation in a Part 2 - Industrial Environment.

FAQ for 1785-LT

What is the size of the embedded memory of the 1785-LT?


The 1785-LT has 6K RAM which can be expanded up to 14K

What are the embedded communication interfaces of the 1785-LT?


The 1785-LT has One (1) RIO port and One (1) DH+ port.

What are compatible memory modules for use with the 1785-LT?


The 1785-LT supports 4K RAM expansion with catalog number 1785-MR; 8 K RAM expansion with catalog number 1785-MS and 8K EEPROM with catalog number 1785- MJ.

Technical Description of 1785-LT

Allen Bradley PLC 5 Processor, 512 Max Total I/O, 512 Analog I/O, DH+ Channel, Remote I/O Channel, 6 Kilowords SRAM (expands to 14 Kilowords)

Repair Services for 1785-LT

Type Lead Time Price Action
Repair Service 2-4 weeks $160cartAdd to Cart

Our highly skilled technicians can repair your 1785-LT. All of our repairs come with a 1 Year DO Supply Warranty. Please contact us for additional information about our repair process.

Revisions for 1785-LT

Please refer to the manual for more information about the 1785-LT such as the wiring diagrams, data sheets and migration or obsolescence details.

Revision Part # Also Known as Availability
1785-LT Ser A
1785-LT/A, Series A, Rev A Request Quote
1785-LT Ser B
1785-LT/B, Series B, Rev B Request Quote
Common misspellings:
  • l785-LT
  • 17b5-LT
  • 1785-1T
  • 1785LT

Reviews for 1785-LT

Internal Review

"The Allen-Bradley 1785-LT is a classic PLC5 controller. This controller feature 6K words of RAM with expansion provision. Compared to the PLC 5/10 and PLC 5/12 which do not support RAM expansion however, the PLC 5/15 support higher I/O density wherein up to 512 I/O is supported. " -DO Supply Tech

Dimensions For 1785-LT

Size
Input Type
Panel Cutout Height in mm
Panel Cutout Width in mm
Terminal Height in mm
Terminal Width in mm
Terminal Overall Depth in mm
Terminal Mounted Depth in mm

Dimensions For 1785-LT

Resolutions For 1785-LT

About

Technical Specifications for 1785-LT

ManufacturerRockwell Automation
Location1771-I/O chassis, left-most slot
Program Scan time:2 ms/K words (bit logic); 8 ms/K words (typical)
Battery:1770-XY
Memory modules:4K RAM expansion, 1785-MR; 8 K RAM expansion, 1785-MS; 8K EEPROM,1785-MJ
Embedded RAM:6K Words; expandable up to 14K Words
I/O capacity:512 I/O; 512 inputs and 512 outputs using 16 or 32-pt modules
Supported Remote I/O:Up to 3 Remote I/O racks
Supported local I/O:Up to 4 Racks (1 resident rack)
Product Description:PLC5 Classic Programmable Controller
BrandAllen-Bradley
Built-in communication:One (1) standalone scanner (local and remote I/O) adapter; One (1) DH+
Hardware addressing:2-slot; 1-slot; ½ slot
Part Number/Catalog No.1785-LT
Keyingbetween 40 and 42; between 54 and 56
Module TypeProcessor
Max Total I/O512
Analog I/O512
DH+ ChannelYes
Remote I/O ChannelYes
Number of Words6 Kilowords SRAM (expands to 14 Kilowords)
Max Total I/O3072 (any mix) or 3072 in + 3072 out (complementary)
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
ManufacturerRockwell Automation
Location1771-I/O chassis, left-most slot
Program Scan time:2 ms/K words (bit logic); 8 ms/K words (typical)
Battery:1770-XY
Memory modules:4K RAM expansion, 1785-MR; 8 K RAM expansion, 1785-MS; 8K EEPROM,1785-MJ
Embedded RAM:6K Words; expandable up to 14K Words
I/O capacity:512 I/O; 512 inputs and 512 outputs using 16 or 32-pt modules
Supported Remote I/O:Up to 3 Remote I/O racks
Supported local I/O:Up to 4 Racks (1 resident rack)
Product Description:PLC5 Classic Programmable Controller
BrandAllen-Bradley
Built-in communication:One (1) standalone scanner (local and remote I/O) adapter; One (1) DH+
Hardware addressing:2-slot; 1-slot; ½ slot
Part Number/Catalog No.1785-LT
Keyingbetween 40 and 42; between 54 and 56
Module TypeProcessor
Max Total I/O512
Analog I/O512
DH+ ChannelYes
Remote I/O ChannelYes
Number of Words6 Kilowords SRAM (expands to 14 Kilowords)
Max Total I/O3072 (any mix) or 3072 in + 3072 out (complementary)
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

About 1785-LT

The Allen-Bradley 1785-LT is a Programmable Logic Controller (PLC). This controller is specifically a PLC 5/15 processor that belongs to the larger family of classic PLC 5 controllers.

The 1785-LT features support for installation of up to Four (4) local racks with One (1) rack being the resident rack. For Remote I/O configuration, this processor supports up to Three (3) RIO racks wherein up to Twelve (12) physical devices are supported. It has built-in communication interfaces such as standalone Scanner port for implementing local and Remote I/O (RIO) connection. Additionally, it also has a Data Highway Plus (DH+) communication port which can be used simultaneously with the RIO port to connect to a variety of devices such as Human Machine Interface (HMI), Supervisory Control and Data Acquisition (SCADA) as well as co-processors in the network for messaging functionalities. These ports may also be used with 3rd party, non-Allen-Bradley devices.

The 1785-LT has an embedded memory amounting 6KWords which can be expanded up to 14K Words. It may also be installed with optional memory modules such as 4K RAM expansion with catalog number 1785-MR; 8 K RAM expansion with catalog number 1785-MS and 8K EEPROM with catalog number 1785-MJ.

With the equipped memory size, the 1785-LT is capable of handling up to 512 I/O of any combination or 512 inputs and 512 outputs in complimentary mode using any supported Sixteen (16) channel or Thirty-Two (32) channel I/O modules. 16-channel modules support 2-slot addressing while 1-slot addressing for 2-slot modules. IOIOIO I/O module configuration must be implemented as well to qualify the hardware configuration.

If you set the switch to the ON position, when communication errors are detected, the outputs that are connected to this chassis remain in their final state to allow the movement of the machine to continue. It is recommended that you set Switch 1 to the OFF position to remove the output energy that is connected to this chassis when any errors are detected. The maximum user memory words of this module are 6K words and this is expandable to 10K or 14K.

The operating temperature of the 1785-LT is 0-60 °C (32-140 °F). The storage temperature of this module is -40-85 °C (-40-185 °F). The relative operating and storage humidity is 5-95% without condensation. The Allen-Bradley 1785-LT has an operating shock of 30 g (3 pulses, 11 ms). The nonoperating shock is 50 g (3 pulses, 11 ms). This module has ESD immunity of 4 kV contact discharges. The Allen-Bradley 1785-LT also follows the Electromagnetic Compatibility (EMC) standards. The 1785-LT has also passed EN 50081-2 EMC - Generic Emission Standard for operation in a Part 2 - Industrial Environment.

FAQ for 1785-LT

What is the size of the embedded memory of the 1785-LT?


The 1785-LT has 6K RAM which can be expanded up to 14K

What are the embedded communication interfaces of the 1785-LT?


The 1785-LT has One (1) RIO port and One (1) DH+ port.

What are compatible memory modules for use with the 1785-LT?


The 1785-LT supports 4K RAM expansion with catalog number 1785-MR; 8 K RAM expansion with catalog number 1785-MS and 8K EEPROM with catalog number 1785- MJ.

Technical Description of 1785-LT

Allen Bradley PLC 5 Processor, 512 Max Total I/O, 512 Analog I/O, DH+ Channel, Remote I/O Channel, 6 Kilowords SRAM (expands to 14 Kilowords)
Repairs
Type Lead Time Price Action
Repair Service 2-4 weeks $160cartAdd to Cart

Our highly skilled technicians can repair your 1785-LT. All of our repairs come with a 1 Year DO Supply Warranty. Please contact us for additional information about our repair process.

Type Lead Time Price Action
Repair Service 2-4 weeks $160cartAdd to Cart

Our highly skilled technicians can repair your 1785-LT. All of our repairs come with a 1 Year DO Supply Warranty. Please contact us for additional information about our repair process.

Revisions

Please refer to the manual for more information about the 1785-LT such as the wiring diagrams, data sheets and migration or obsolescence details.

Revision Part # Also Known as Availability
1785-LT Ser A
1785-LT/A, Series A, Rev A Request Quote
1785-LT Ser B
1785-LT/B, Series B, Rev B Request Quote

Common misspellings:
  • l785-LT
  • 17b5-LT
  • 1785-1T
  • 1785LT
PDF
Reviews

Reviews for 1785-LT

Internal Review

"The Allen-Bradley 1785-LT is a classic PLC5 controller. This controller feature 6K words of RAM with expansion provision. Compared to the PLC 5/10 and PLC 5/12 which do not support RAM expansion however, the PLC 5/15 support higher I/O density wherein up to 512 I/O is supported. " -DO Supply Tech