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1785-L40C15 | Allen Bradley | PLC-5/40C Processor

  • Brand/ Manufacturer:

    Allen Bradley
  • Dimensions:

  • Weight:

  • Country of Origin: :

    United States
  • Description:

    PLC -5/40 CONTROLNET Processor

Mfr. Part Number:



         Allen-Bradley / Rockwell Automation


Allen-Bradley 1785-L40C15 PLC-5/40C Processor with ControlNet 48K SRAM

Full Description:

Allen-Bradley 1785-L40C15 PLC-5/40C Processor with ControlNet, 48K Word SRAM. User

Memory Words, Max: 48K; Total I/O, Max: 2048 (any mix), 2048 in and 2048 out 

(complimentary); ControlNet I/O Transmission Rate: 5 Mbit/s; 

Number of ControlNet 

Ports: 1 (redundant); Maximum Number of Nodes: 48 (without repeater), 99 (with 

repeaters); Number of Remote I/O Racks, Max: 15; Number of Remote I/O Devices, Max: 

60; Number of Ports Configurable for DH+ or Remote I/O (Adapter or Scanner): 2; Serial 

Ports: 1; Coprocessor Ports: 1

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The Allen-Bradley 1785-L80C15 is a ControlNet PLC5 Programmable Logic Controller (PLC). This controller features a variety of embedded communication ports such as serial, Data Highway Plus (DH+), DH using 1785-KA, Remote I/O (RIO) and ControlNet. It supports a maximum user memory of 48K Words and capable of handling any mix of discrete I/O with a total of 2048 point and 2048 input and 2048 output in complimentary mode.

The Allen-Bradley 1785-L40C15 is a Programmable Logic Controller (PLC) from the classic PLC5 series. This controller is specifically part of the 1785 ControlNet PLC5 Programmable controllers, equipped with dual ControlNet communication interface with secondary and tertiary interfaces.

The 1785-L40C15 is designed to cater a maximum of controller memory up to 48KWords, able to handle 2048 I/Os or 2048 Input and 2048 output when operated in complimentary mode. It may be installed with memory modules to reach the memory limit. This controller is capable of implementing distributed I/O architectures with compatibility to a variety of distributed I/O platforms such as Bulletin 1771 I/O, 1794 I/O, 1746 I/O, and 1791 I/O modules, including 8-point, 16-point, 32-point, specialty and intelligent modules.


Rockwell Automation

Max Total I/O

2048 (any mix); 2048Input / 2048 output (complimentary)

Module Type


Part Number/Catalog No.


Control Coprocessor Expansion Port




Communication Ports

Data Highway Plus (DH+); Remote I/O (RIO); Serial; DH using 1785-KA; Two (2) ControlNet

Controller Memory

up to 48 Kwords

Hardware Addressing

2-slot; 1-slot; 1/2-slot

Program Scan time

0.5 ms per K word (bit logic) 2 ms per K word (typical)

Module Location

1771-A1B, -A2B, A3B, -A3B1, -A4B chassis; left-most slot

I/O system

Bulletin 1771 I/O, 1794 I/O, 1746 I/O, and 1791 I/O including 8-, 16-, 32-pt, and intelligent modules


Allen-Bradley 1770-XYC

Memory Modulues

1785-ME32, 1785-ME64, 1785-M100

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