Starting with PLC 2â??s and 3â??s and handheld SLC 150â??s communicating with DH+ or serial to Panelviews running Panelbuilder we have grown and adapted in our field that is now using AOIâ??s and UDTâ??s. In an ever-changing environment to meet the demands and needs of manufacturing and process standards, we have had to learn an entire toolbox of platforms.