In the Siemen's Step 7 world what is the difference between an Input Word (IW) and Peripheral Input Word (PIW)?
For example, if I right-click on an analog input module and 'Edit Symbolic Names' the symbols that show up are IW's (e.g., IW512). Yet, I can reference this same address as PIW512 within logic. Is there any difference? In this example it would appear IW512 = PIW512, but is this always true?
Thanks.
For example, if I right-click on an analog input module and 'Edit Symbolic Names' the symbols that show up are IW's (e.g., IW512). Yet, I can reference this same address as PIW512 within logic. Is there any difference? In this example it would appear IW512 = PIW512, but is this always true?
Thanks.