How to Calculate PLC Program Memory and Determine the Right Size for Your Needs

Question:

When choosing a Programmable Logic Controller (PLC), what is the guideline for calculating program memory? Additionally, how do you determine the appropriate memory size for a PLC?

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Discover the differences in memory types and I/O configurations across various PLC (Programmable Logic Controller) manufacturers. Whether you’re looking for insights on coding, data storage, or input/output management, each PLC has its unique characteristics. Get in touch with industry experts or makers for personalized guidance!

Kudos to @spaderkung! It's especially relevant now that several PLC vendors are allowing the storage of not only the program documentation but also the actual code directly on the PLC unit. This feature is incredibly convenient, but it does require significantly more storage space than the program itself!

A Programmable Logic Controller (PLC) will be engineered to possess sufficient memory to accommodate the programs that correspond to the extensive range of Input/Output (I/O) it is designed to support. Therefore, unless you anticipate that your programming requirements will demand an exceptionally high memory capacity, any PLC capable of managing your I/O needs will also have the adequate memory to execute your software applications effectively.

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