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Kiiza

OMRON PLC MEMORY AREAS

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Hello guys,

I have gotten to a level where I can do a few things with an OMRON PLC. However, there's something that is supposed to be basic by now but I still don't understand it, and I will appreciate your help on this .

What is the difference between the D, W and H memory areas of the PLC? And in what instances do I utilise each of them for storage of my data?

Thank you.

 

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From a functional standpoint the only difference in those 3 is that the W memory area data is cleared during a restart and there are some restrictions on accessing D memory at the bit level depending on what CPU you have. In theory the W area should be used as Work (scratchpad) memory, the D area should be used for Data storage, and the H area should be used for Holding bit storage. In practice you can use them however you want in your program.

Edited by Mendon Systems
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Thank you  Dick Oestreich,

That does give me a general understanding.

I am used to SIEMENS PLCs and I would relate the two as follows from what I seem to understand;

D..........................Data block memory

W.........................Local memory

H..........................The M memory

Correct me if I am wrong, Thanks again.

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I've never even seen a Siemens PLC so I can't help you there.

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