ISPSoft User Manual 14.2.8 Internal Property The internal property provides users to use in POUs and particular parameter properties in SFC programming. The parameter properties are categorized into Step, Action and Transition. The following content introduce the properties accordingly. 14.2.8.1 Step Property To use SFC in POU, the step property adopts STRUCTURE framework to display. The structure consists of POU Name, Step Name and Step Member. Users can select the appropriate POU and Step name then decide on the step member. 14-22