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Ladder Logic (LAD) for S7-300 and S7-400 Programming
cache.industry.siemens.comLadder Logic (LAD) for S7-300 and S7-400 Programming 4 Reference Manual, 05/2010, A5E02790079-01 Requirements To use this Ladder Logic manual effectively, you should already be familiar with the theory behind S7 programs which is documented in the online help for STEP 7. The language packages also use the
Statement List (STL) for S7-300 and S7-400 Programming
cache.industry.siemens.comThis manual is valid for release 5.6 of the STEP 7 programming software package. Compliance with Standards STL corresponds to the "Instruction List" language defined in the International Electrotechnical Commission's standard IEC 1131-3, although there are substantial differences with regard to the operations.