Chapter 10 Ladder Diagram *. If the Auto-leading ‘Add Symbol’ Dialog checkbox in the Options window is selected, the Add Symbol window will appear automatically after users type a symbol which is not declared. Please refer to section 2.3.1 for more information. Right-click on top of the function block, select Auto Generate Symbols and choose to generate by default. The default name usually adopts function block name + pin name and once symbols are generated type in pin position (see below); type in the spelling or words to generate symbols and type in pin position. Programs PLCs using structured text supported by function blocks and pins of DVPxxMC/AS5xx series as below shown. 10-17