The Machine Primary Control Elements (MPCE) 1 and 2 are typically a relay with force guided contacts. When a safety interlock, light curtain, or e-stop switch opens a circuit, the MPCE NO contacts ...

Open-Source Robotics and Process Control: Sensor, Actuator and Control Circuit Examples – Part 1. August 19, 2008 by EDN ... I will present a few useful “cookbook” applications for real-time control ...