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3 year warranty

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  • 4.20 (10)
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DirectLogic 405 (DL405) model D4-RAM-2 was produced by Automation Direct as a CMOS RAM Memory Cartridge; the amount of memory is 15.5K RAM. The memory clear method used when needed to clean the memory is electrical.



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  • Part Number: D4-RAM-2
  • Manufacturer: Automation Direct
  • Series: DirectLogic 405

D4-RAM-2 Technical Specifications

Part Number D4-RAM-2
Series DirectLogic 405
Manufacturer Automation Direct
Model Type Memory Cartridge
Memory Type CMOS RAM
Program Storage Memory Capacity 15.5K
Cartridge Battery Type Lithium
Writing Cycle Life Not Available on this Model

Product Description

The Automation Direct Model D4-RAM-2 is a CMOS RAM cartridge. Developed for the DirectLogic 405 family, this cartridge is designed to interface directly with the central processing unit (CPU) modules of the same series. Most CPU modules for DL405 programmable logic controllers do not include integrated memory and require external cartridges like this. System memory is needed to store programming data for the CPU. Units like D4-440 include no system memory and require a cartridge, while others like D4-450 have integrated memory but not a significant amount of space. The only module that cannot accept the cartridge is the D4-430 CPU.

CMOS RAM is offered to the CPU by this cartridge. D4-RAM-2 contains 15.5K of memory for program and data storage. RAM can be written to and read from an infinite amount of times, but it does require a power source to maintain that memory. Only while the PLC is powered will the RAM maintain the saved data. If no battery backup is used, the contents of the memory will be lost once a power supply is disrupted.

Outlined storage and installation parameters should be followed to prevent any damage to the cartridge. On the back of the CPU module, a memory card slot is available. This cartridge can only be installed in that specific memory slot on the module. Be sure to install the entire PLC unit in a temperature-controlled environment to prevent any CPU or PLC damage. A detailed installation guide is available in a series manual and a device datasheet. The appropriate manual is the D4-USER-M Instruction Manual.

Frequently Asked Questions about D4-RAM-2

Three other memory cartridges are available in the DirectLogic 405 series; what are the differences between the D4-RAM-2 and the remaining cartridges?

The D4-RAM-2 model is just one of the memory cartridges available. The remaining cartridges are UVPROM, EEPROM, and CMOS RAM. The other CMOS RAM cartridge, called the D4-RAM-1 model, is the predecessor to the D4-RAM-2 model; the D4-RAM-1 cartridge has a program storage capacity of 7.5K, which is significantly less than the storage capacity of this unit. The UVPROM cartridge, called the D4-UV-2 model, has the same storage capacity as the D4-RAM-2 unit. The final cartridge, the EEPROM cartridge, has an identification number of D4-EE-2 and has the same memory capacity as the D4-RAM-2 and D4-UV-2 models. 

What CPUs are required to have a memory cartridge attached?

Three of the CPUs in the DL405 family are required to have a memory cartridge, such as the D2-RAM-2 model. The D4-440, D44DC-1, and D4-440DC-2 models all require memory cartridges. The D4-450DC-2 model has 7.5K of built-in flash program memory, but a memory cartridge can be added to enhance the amount of memory on the unit.

Reviews For D4-RAM-2

Internal Review

The best thing about the D4-RAM-2 model is that it is the enhanced and newest model of CMOS RAM units. The previous model, D4-RAM-1, has less memory capacity than this model. When connected to a CPU such as the D4-440 the D4-RAM-2 cartridge will add an extra memory storage capacity of 15.5K. AX Control Tech

Repair Services For D4-RAM-2

Type Lead Time Price Action
Repair Service 1-2 weeks $267

Our highly skilled technicians can repair your D4-RAM-2. 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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