PSS (possibly "Process Systems Solutions" or similar) seems to be a company or a product line that offers various software solutions for industrial automation, process control, and related fields. WinPro 231 might be one of their products designed for specific tasks such as data acquisition, control systems, or engineering calculations.
PSS Winpro 2.3.1 remains a critical piece of legacy engineering software for professionals maintaining the range of programmable safety systems. Developed by Pilz , this system tool supports the design, programming, and diagnostics of safety and automation functions within complex industrial machinery. pss winpro 231 download 2021