![]() In this case, a memory location stores a “pointer†to another memory location. The following are examples of direct addressing:īy using the methods of indirect addressing the address used by an instruction can be varied to point to any number of locations. When a direct addressed is referenced by an instruction there is no question as to the location in memory. ![]() The most common form of addressing used in the Siemens S7 PLCs is direct and symbolic. Check out their website for hands-on and online training classes. This is a really nice explanation of a difficult but important subject. The following is provided by Automation Training from their excellent Siemens Step 7 training manual.
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