This video provides an introduction to data types and structures in the SEL Real-Time Automation Controller (RTAC) IEC 61131-3 logic engine and how to access subattributes of extended data types, such as SPS and MC. We also discuss other data types, such as SPS and MV, and the data type conversion functions built into ACSELERATOR RTAC SEL-5033 Software. View in fullscreen mode for best image quality.