1785-L40E | Allen-Bradley PLC-5 EtherNet/IP PLC-5/40E Controller, 48K Word SRAM
1785-L40E | Allen-Bradley PLC-5 EtherNet/IP PLC-5/40E Controller, 48K Word SRAM
1785-L40E | Allen-Bradley PLC-5 EtherNet/IP PLC-5/40E Controller, 48K Word SRAM
    1785-L40E | Allen-Bradley PLC-5 EtherNet/IP PLC-5/40E Controller, 48K Word SRAM
1785-L40E | Allen-Bradley PLC-5 EtherNet/IP PLC-5/40E Controller, 48K Word SRAM

1785-L40E | Allen-Bradley PLC-5 EtherNet/IP PLC-5/40E Controller, 48K Word SRAM

Part #: 1785-L40E Manufactured by: Allen-Bradley
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Product Overview
Allen Bradley PLC 5 PLC-5/40E Ethernet PLC-5 Processor, 2048 Max Analog I/O, 48 Kilowords, 3.6 Amperes Backplane Current (...  Read more
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Product Description P/N: 1785-L40E

Description / Specifications

Description 

The Allen-Bradley 1785-L40E is an Allen-Bradley PLC5 Controller. This controller has 48K words of user memory, supports 2048 (any mix) or 2048 in + 2048 out (complementary). It has embedded communication ports such as Two (2) DH+/Remote I/O (Adapter or Scanner) One (1) serial port, configurable for RS-232 and 423 and RS-422A standards and One (1) Ethernet communication port.

 

Technical Specifications 

 

Brand Allen-Bradley
Manufacturer Rockwell Automation
Part Number 1785-L40E
Product Type Programmable Logic Controller
Power Supply 1771-P4S, -P6S, -P4S1, -P6S1
Power Dissipation 17.3W
Backplane current load 3.3A
Embedded Communication interfaces 4 DH+/Remote I/O (Adapter or Scanner) 1 serial port, configurable for RS-232 and 423 and RS-422A standards
Memory 48 KWords
Battery 1770-XYC
Maximum number of I/O per link 32
Operating Temperature EC 60068-2-1 (Test Ad, Operating Cold), IEC 60068-2-2 (Test Bd, Operating Dry Heat), IEC 60068-2-14 (Test Nb, Operating Thermal Shock): 0...60 o C (32...140 o F)
Product Family PLC5
Non-Operating Temperature IEC 60068-2-1 (Test Ab, Un-packaged Nonoperating Cold), IEC 60068-2-2 (Test Bc, Un-packaged Nonoperating Dry Heat), IEC 60068-2-14 (Test Na, Un- packaged Nonoperating Thermal Shock): –40...85 o C (– 40...185 o F)
Module Type Ethernet PLC-5 Processor
Processor PLC-5/40E
Battery-Backed Static RAM Yes
EEPROM Program Backup Option (using 1785-ME16, -ME32, -ME64, and -M100) Yes
Protected Memory No
Max Total I/O 2048 (any mix) or 2048 in + 2048 out (complementary)
Max Analog I/O 2048
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 61
Max I/O Chassis Extended Local 0
Max I/O Chassis Universal Remote 60
RS-232-C/422-A/423- A Ports 1
Control Coprocessor Expansion Port Yes

  

 

Information About 1785-L40E

The Allen-Bradley 1785-L40E is a Programmable Logic Controller (PLC). This controller module is ideally used for medium to large application and capable of interfacing simultaneously with a variety of devices for automation of machine s or processes.

The 1785-L40E is installed to a 1771 chassis. This chassis hosts the electronic backplane where system power is supplied and distributed among other modules including the 1785-L40E controller. Compatible chassis for this controller are 1771-A1B, 1771-A2B, 1771-A3B, 1771-A3B1, and 1771-A4B while compatible power supplies are 1771-P4S, -P6S, -P4S1, -P6S1. The controller’s current draw is 3.3A with power dissipation of 17.3W.

The 1785-L40E supports a variety of industrial protocols via the embedded communication ports such as Two (2) Data Highway + (DH+) /Remote I/O (RIO) (Adapter or Scanner) combination port, One (1) serial port, that supports RS-232, 423 and RS-422A EIA standards and One (1) Ethernet communication port that supports 10/100 Mbps transmission speed. All these communication ports may be used for communicating with visualization system, PLC5 controllers and other Allen-Bradley controllers, and other devices.

This controller supports a variety of programming languages per IEC 61131-3 standard. Supported programming languages include Sequential Function Chart (SFC), Ladder Logic, and Structured Text (ST).

The 1785-L40E supports implementation of automatic and manual control of discrete and analog devices, perform signal conditioning, implementation of advanced control algorithms such as Proportional-Integral and Derivative (PID) functions, among other industrial functions. This controller has built-in memory of 48KB can handle 2048 any mix or 2048 input and 2048 output (complement.) It can support up to 61 chassis wherein 1 chassis is the local chassis and the other 60 chassis can be remote I/O systems.

This module is pre-installed with an Allen-Bradley 1770-XYC battery module. It supports installation of optional backup memory devices such as 1785-ME64, 1785-ME32, or the 1785-M100 lithium batteries. The 1785-L40E is compatible with 8-point, 16-point, 32-point, and 1771 intelligent I/O modules, and the controller offers users a maximum selectable I/O scan time of just 0.5ms for the extended-local I/O adapter, an I/O scan time of 10 milliseconds for the remote I/O rack at 57.6 kbps, and a scan time of 3 milliseconds for the remote I/O rack at 230.4 kbps. It supports maximum of 16 I/O racks (0 to 15), and up to 61 I/O chassis links.

The 1785-L40E addresses the I/O hardware via 3 different modes. Specifically, these addressing methods are 2-slot mode which addresses any mix of 8-point modules and a pair of 16-point modules, the 1-slot mode which addresses any mix of 8 and 16-point modules, and 1 pair of 32-point I/O modules, and the half-slot mode which addresses any mix of 8-point, 16-point, and 32-point modules.

The 1785-L40E has 1 dedicated 15-pin, Ethernet/IP port (with TCP/IP protocol), 2 Data Highway Plus (DH+)/Remote I/O (Adaptor or Scan) ports for connection to the Allen-Bradley Data Highway (DH+) network, and 1 RS-232-C, 422-A, and 423-A serial communication port. The controller has an internal circuit clock that has a +/- 5 min per month of accuracy variation, and it will function without de-rating at a temperature of 0 to 60 degrees Celsius (32 to 140 degrees Fahrenheit) around 5 to 95% non-condensing humidity range. The controller has an operational shock withstand of 30G with 1G operational vibration at 10 to 500 Hertz without, and is CSA, C-TICK, CE, and UL-certified. It weighs averagely 1.38 kilograms (3.0 pounds) and comes in an open enclosure.



Manufacturer information

Allen-Bradley, a brand of Rockwell Automation, specializes in manufacturing industrial automation equipment. The product range includes programmable logic controllers (PLCs), motion control systems, safety devices, motor control equipment, automation software, and HMI panels. Allen-Bradley products are known for their reliability and integration with other systems.

Frequently Asked Questions about 1785-L40E
Question: What is the 1785-L40E?
Date Update:04/06/2025
Answer:

The 1785-L40E is an Allen-Bradley SLC 500 series processor that provides a highly reliable and flexible platform for small to medium-sized control applications. It supports up to 40K words of memory and provides Ethernet communication for integration into larger control systems. It is a popular choice for distributed control applications and interfaces easily with a variety of I/O modules and Ethernet-based devices.

Question: What are the key specifications of the 1785-L40E?
Date Update:04/06/2025
Answer:

Key specifications of the 1785-L40E processor include:

  • Processor Memory: 40K user memory (program and data storage).
  • Input/Output Capacity: Can support up to 30,000 I/O points (depending on system configuration).
  • Processor Speed: Supports fast processing with scan times typically between 10ms to 50ms (depending on the program and configuration).
  • Ethernet Communication: Built-in Ethernet port for communication with Ethernet/IP and other devices over a network.
  • Chassis Compatibility: Works in SLC 500 chassis along with remote I/O racks for expanded I/O capacity.
  • Communication Ports: DH+ (Data Highway Plus), DF1 serial communication, and Ethernet.
  • Power Supply: Typically requires 24V DC power, depending on the specific configuration of the system.
  • Operating Temperature Range: Typically 0°C to 60°C (32°F to 140°F).
Question: How do I connect the 1785-L40E to an Ethernet network?
Date Update:04/06/2025
Answer:

To connect the 1785-L40E to an Ethernet network, follow these steps:

  • Ethernet Cable: Use a standard Ethernet cable to connect the Ethernet port on the 1785-L40E processor to the Ethernet switch or router.
  • Assign an IP Address: Use RSLogix 500 or Studio 5000 software to assign an IP address to the 1785-L40E processor. You will need to configure network settings, such as subnet mask and gateway, if necessary.
  • Configure Communication: Once the IP address is assigned, configure communication settings within the software. The Ethernet port on the 1785-L40E supports Ethernet/IP or other Ethernet-based protocols, depending on the application.
  • Network Settings: Ensure all devices on the network have valid IP addresses and are on the same subnet for proper communication.
Question: What communication protocols does the 1785-L40E support?
Date Update:04/06/2025
Answer:

The 1785-L40E processor supports several communication protocols for integration into different network setups:

  • Ethernet/IP: Supports communication with other devices that use the Ethernet/IP protocol (such as other PLCs, HMIs, and drives).
  • DH+ (Data Highway Plus): Can communicate with other Allen-Bradley devices over a DH+ network, such as older SLC processors, PLC-5, or ControlLogix devices.
  • DF1 (RS-232): Supports serial communication (DF1) for point-to-point connections to devices such as HMIs or other PLCs.
  • Remote I/O: Can be used with remote I/O racks and supports both local and remote I/O modules to expand I/O capacity.

For all protocols, communication settings (e.g., baud rate, node address, and IP address) must be configured within RSLogix 500 or Studio 5000.

Question: Can I use the 1785-L40E with newer Allen-Bradley controllers?
Date Update:04/06/2025
Answer:

Yes, the 1785-L40E processor can be used with newer Allen-Bradley controllers and devices, although it is part of the SLC 500 series. It can communicate with other systems using Ethernet/IP, DH+, and DF1 communication protocols. However, modern PLCs such as ControlLogix and CompactLogix may require additional communication modules to integrate with older SLC 500 processors like the 1785-L40E.

IQElectro is not an authorized distributor.
QElectro LLC (IQElectro) is NOT an Authorized Distributor or in any way affiliated with Rockwell Automation, Siemens, or any other Manufacturers. IQElectro is NOT an Authorized Dealer of this product. The product may be of older version, date codes, or design than that available from authorized dealers. As IQElectro is not an authorized dealer of this product, the Original Manufacturer's Warranty and Support DO NOT apply. IQElectro sells SURPLUS only and DOES NOT SELL SOFTWARE or FIRMWARE licenses For more detailed information, please refer to the full version of our disclaimer policy Disclaimer Policy.
Description / Specifications

Description 

The Allen-Bradley 1785-L40E is an Allen-Bradley PLC5 Controller. This controller has 48K words of user memory, supports 2048 (any mix) or 2048 in + 2048 out (complementary). It has embedded communication ports such as Two (2) DH+/Remote I/O (Adapter or Scanner) One (1) serial port, configurable for RS-232 and 423 and RS-422A standards and One (1) Ethernet communication port.

 

Technical Specifications 

 

Brand Allen-Bradley
Manufacturer Rockwell Automation
Part Number 1785-L40E
Product Type Programmable Logic Controller
Power Supply 1771-P4S, -P6S, -P4S1, -P6S1
Power Dissipation 17.3W
Backplane current load 3.3A
Embedded Communication interfaces 4 DH+/Remote I/O (Adapter or Scanner) 1 serial port, configurable for RS-232 and 423 and RS-422A standards
Memory 48 KWords
Battery 1770-XYC
Maximum number of I/O per link 32
Operating Temperature EC 60068-2-1 (Test Ad, Operating Cold), IEC 60068-2-2 (Test Bd, Operating Dry Heat), IEC 60068-2-14 (Test Nb, Operating Thermal Shock): 0...60 o C (32...140 o F)
Product Family PLC5
Non-Operating Temperature IEC 60068-2-1 (Test Ab, Un-packaged Nonoperating Cold), IEC 60068-2-2 (Test Bc, Un-packaged Nonoperating Dry Heat), IEC 60068-2-14 (Test Na, Un- packaged Nonoperating Thermal Shock): –40...85 o C (– 40...185 o F)
Module Type Ethernet PLC-5 Processor
Processor PLC-5/40E
Battery-Backed Static RAM Yes
EEPROM Program Backup Option (using 1785-ME16, -ME32, -ME64, and -M100) Yes
Protected Memory No
Max Total I/O 2048 (any mix) or 2048 in + 2048 out (complementary)
Max Analog I/O 2048
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 61
Max I/O Chassis Extended Local 0
Max I/O Chassis Universal Remote 60
RS-232-C/422-A/423- A Ports 1
Control Coprocessor Expansion Port Yes

  

 

Information About 1785-L40E

The Allen-Bradley 1785-L40E is a Programmable Logic Controller (PLC). This controller module is ideally used for medium to large application and capable of interfacing simultaneously with a variety of devices for automation of machine s or processes.

The 1785-L40E is installed to a 1771 chassis. This chassis hosts the electronic backplane where system power is supplied and distributed among other modules including the 1785-L40E controller. Compatible chassis for this controller are 1771-A1B, 1771-A2B, 1771-A3B, 1771-A3B1, and 1771-A4B while compatible power supplies are 1771-P4S, -P6S, -P4S1, -P6S1. The controller’s current draw is 3.3A with power dissipation of 17.3W.

The 1785-L40E supports a variety of industrial protocols via the embedded communication ports such as Two (2) Data Highway + (DH+) /Remote I/O (RIO) (Adapter or Scanner) combination port, One (1) serial port, that supports RS-232, 423 and RS-422A EIA standards and One (1) Ethernet communication port that supports 10/100 Mbps transmission speed. All these communication ports may be used for communicating with visualization system, PLC5 controllers and other Allen-Bradley controllers, and other devices.

This controller supports a variety of programming languages per IEC 61131-3 standard. Supported programming languages include Sequential Function Chart (SFC), Ladder Logic, and Structured Text (ST).

The 1785-L40E supports implementation of automatic and manual control of discrete and analog devices, perform signal conditioning, implementation of advanced control algorithms such as Proportional-Integral and Derivative (PID) functions, among other industrial functions. This controller has built-in memory of 48KB can handle 2048 any mix or 2048 input and 2048 output (complement.) It can support up to 61 chassis wherein 1 chassis is the local chassis and the other 60 chassis can be remote I/O systems.

This module is pre-installed with an Allen-Bradley 1770-XYC battery module. It supports installation of optional backup memory devices such as 1785-ME64, 1785-ME32, or the 1785-M100 lithium batteries. The 1785-L40E is compatible with 8-point, 16-point, 32-point, and 1771 intelligent I/O modules, and the controller offers users a maximum selectable I/O scan time of just 0.5ms for the extended-local I/O adapter, an I/O scan time of 10 milliseconds for the remote I/O rack at 57.6 kbps, and a scan time of 3 milliseconds for the remote I/O rack at 230.4 kbps. It supports maximum of 16 I/O racks (0 to 15), and up to 61 I/O chassis links.

The 1785-L40E addresses the I/O hardware via 3 different modes. Specifically, these addressing methods are 2-slot mode which addresses any mix of 8-point modules and a pair of 16-point modules, the 1-slot mode which addresses any mix of 8 and 16-point modules, and 1 pair of 32-point I/O modules, and the half-slot mode which addresses any mix of 8-point, 16-point, and 32-point modules.

The 1785-L40E has 1 dedicated 15-pin, Ethernet/IP port (with TCP/IP protocol), 2 Data Highway Plus (DH+)/Remote I/O (Adaptor or Scan) ports for connection to the Allen-Bradley Data Highway (DH+) network, and 1 RS-232-C, 422-A, and 423-A serial communication port. The controller has an internal circuit clock that has a +/- 5 min per month of accuracy variation, and it will function without de-rating at a temperature of 0 to 60 degrees Celsius (32 to 140 degrees Fahrenheit) around 5 to 95% non-condensing humidity range. The controller has an operational shock withstand of 30G with 1G operational vibration at 10 to 500 Hertz without, and is CSA, C-TICK, CE, and UL-certified. It weighs averagely 1.38 kilograms (3.0 pounds) and comes in an open enclosure.



Manufacturer information

Allen-Bradley, a brand of Rockwell Automation, specializes in manufacturing industrial automation equipment. The product range includes programmable logic controllers (PLCs), motion control systems, safety devices, motor control equipment, automation software, and HMI panels. Allen-Bradley products are known for their reliability and integration with other systems.

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