Kilde: https://www.youtube.com/playlist?list=PLC76AD9A5EF6E8212
Kilde S7-1200: https://www.siemens.com/global/en/home/products/automation/systems/industrial/plc/s7-1200.html
Bilder: https://www.automation.siemens.com/bilddb/search.aspx?lang=en&aktprim=0&usestructure=2&nodeid=10045648
Programming Guidelines and Programming Styleguide for SIMATIC S7-1200 and S7-1500