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D4-UV-2 is a UVPROM memory cartridge developed by Automation Direct, Facts Engineering, and Koyo. Designed for the DirectLogic 405 series, this cartridge interfaces directly with the central processing unit (CPU) modules of the same family. The CPU modules provide the programmable logic controller with memory space to store programming information and device data. Modules like D4-440 require a memory cartridge as there is no system storage, while others like D4-450 have integrated memory, but not a significant amount. Only the D4-430 cannot accept memory cartridges.
UVPROM memory is provided by the cartridge to the CPU module. D4-UV-2 features 15.5K of memory space to store various programs and data. This cartridge can be read from an infinite number of times without an issue. All written data is stored indefinitely on the card, with no power source required to preserve the data. No battery is required since power is not needed to maintain the device’s data. Though it can be read continuously, the card does have a finite number of times it can be written to. The life cycle of this memory cartridge is limited to 10,000 writes. Ultraviolet light is used as the memory clear method for this card.
To prevent damages to the cartridge, be sure to follow all installation and storage parameters. D4-UV-2 is simple to install. The cartridge fits into the memory card slot found on the back of D4-440 CPUs or higher. Once installed, the device is ready to be read and written to. A complete installation guide is available in both the series manual and the device datasheets. Technical support for these cartridges was originally provided by the manufacturers, Automation Direct and Koyo.
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