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D4-440 Image One
3 year warranty

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  • 4.67 (6)
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The D4-440 module is a CPU produced by Automation Direct for the DirectLogic 405 series. It has a total memory available of 22.5K with 7.0K V-memory. There is 16,384 I/O per remote channel limited to 2688.



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  • Part Number: D4-440
  • SKU: D4440AD
  • Manufacturer: Automation Direct
  • Series: DirectLogic 405

D4-440 Technical Specifications

Model Number D4-440
Series DirectLogic 405 (DL405)
Manufacturer Automation Direct
Product Type DL405 CPU Companion
Number of Built-In Ports 2 Ports
Maximum Baud Rate 19.2K
Typical Scan 2-3 ms
Number of PID Loops Max. 16
Used With Memory Cartridges

Product Description

The Automation Direct D4-440 is a central processing unit (CPU) module designed for the DirectLogic 405 series; the module is developed to interface with programmable logic controllers from the same series. Capable of performing fast boolean execution, this device is built for an optimal user experience. A separately sold memory cartridge is required to save programs to the module. The memory cartridges used with the D4-440 module are D4-RAM-1, D4-RAM-2, D4-EE-2, and D4-UV-2; each memory cartridge has a different memory type. Multiple power supply options are available using the device, including 110 and 220 VAC. The input voltage range of the device varies depending on the power supply. When operating 110 VAC, input voltages can range from 85 to 132 VAC. 220 VAC, in turn, requires between 170 and 264 VAC.

D4-440 features dual communication ports for programming and network connectivity. Port 1 is a 15-pin programming port that can read RS232 inputs. It can directly connect to several program writing devices, including computers, handheld programmers, DV-1000, and other operator interfaces. Port 2 is a 25-pin auxiliary port capable of inputting RS232/422 connections with a user-selectable baud rate. A slave port, this input can connect to DirectSOFT, DirectNET, and other operator interfaces. Baud rates are selectable using the CPU dipswitches found on the device. Users can use the CPU key switch to select either RUN, TERM, or STOP. The module has six status indicators, providing visual diagnostics, including PWR, RUN, CPU, BATT, I/O, and COM.

The D4-440 CPU has six status indicators on the front of the module to help the user and the system identify the operational function of the D4-440 and potential connections to ensure that no personal injury or property damage could occur. 

Frequently Asked Questions about D4-440

What is D4-440? What does it do?

Model D4-440 is one of the DirectLogic 4045 CPUs. It has built-in communication ports for direct connection to a handheld programmer produced by Automation Direct or a personal computer to aid in programming functions. This module is also used to provide a range of power supply options, such as 125 VDC, 24 VDC, or 110 VAC. It requires an additional memory cartridge. 

What is the key switch on the D4-440 used for?

The D4-440 key switch is used for controlling the CPU. It has a stop function that forces the CPU to stop. The term switch will allow peripherals such as DirectSOFT, DCM, and HPP to be selected for test and operating modes. The run function on the switch forces the CPU into run mode. 

Reviews For D4-440

Internal Review

While the D4-440 CPU is an excellent module, it is affected by a lack of total memory. While the D4-440 is more enhanced than the D4-430 CPU, the D4-440 has a lower memory capacity than the D4-450 which also has more programming and diagnostics features. - AX Control Tech

Repair Services For D4-440

Type Lead Time Price Action
Repair Service 1-2 weeks $300

Our highly skilled technicians can repair your D4-440. All of our repairs come with a 3 Year AX Control Warranty. Please contact us for additional information about our repair process. To receive the repair pricing and lead time listed above please process your repair order via our website. The following repair options may be available upon request:

  • 48-72hr Rush Repair
  • Detailed Repair Reports
  • AX Control Certificate of Warranty

AX Control Warranty Info

All products we sell are backed by our unparalleled warranty. A warranty certificate will be provided with your order upon request.
All PLCs, HMIs, and Turbine Control Boards: 3 Years
All AC/DC and Servo Drives: 2 Years
All Motors: 1 Year
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