TIA Portal: SWAP instruction??? Why we have to use?

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What is endianness and what are Big endian and little endian? Siemens data write endianness .What is Swap instruction? When we have to use it?
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I know it's well meant but this is misinformation. Siemens 1500 plcs are little endian but swap internally to big endian when you use standard blocks as you do in your case. This is for 300/400 compability

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