You must be using a FX series PLC, with a Q series using GX Works 2 the need for this is eliminated. TO and FROM are used to read and write data between the PLC and any extension units connected to it. I'm guessing K0 and then some kind of reading from K5 as well? And ultimately leave it all in K4. I would assume it read an word-value (as in analogue) from one of them. How does the "To" and "From" functions work? And when I ask about these, I am fairly certain I have no real clue as to how their correlation with the operands. Now there's no doubt about how that works. A tad deeper than necessarily, but that's neat.
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