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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