@BOOK{ iet:/content/books/ce/pbce050e, author = {R. W. Lewis}, keywords = {IEC 1131-3;structured text;sequential function chart;function block diagram;instruction list;function block;ladder diagram;}, title = {Programming Industrial Control Systems Using IEC 1131-3}, publisher = {Institution of Engineering and Technology}, year = {1998}, series = {Control, Robotics and Sensors}, url = {https://digital-library.theiet.org/;jsessionid=195wi4ocvee7t.x-iet-live-01content/books/ce/pbce050e} }