Elements Of Ladder Logic (Lad) - Siemens SIMATIC S7-200 Manual

4.5

Elements of ladder logic (LAD)

0 and 1 are the only data states in digital control logic. The 0 state is designated as false and
the 1 state is true. This is why we say a PLC scan is either 0 (false) or 1 (true).
Getting Started - Beginners
Training Documents, 07/2007, A5E01031470B
First programming exercise
4.5 Elements of ladder logic (LAD)
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