PLC-based autocontrol system for DC-arc plasma jet system to deposit diamond by CVD

For the DC-arc plasma jet system to deposit diamond by CVD(chemical vapor deposition),a PLC was taken as the core of its autocontrol system with touch screen as man-machine interface and lad dleder as programming language.In such a way not only the automatic operation can be implemented,but also the remote monitoring for multiple devices and long-term recording of operational data are both available via the 485 bus for the confiquration softwares of upper computer.The actual running result showed that the autocontrol system thus designed is composed of reliable hardwares and stably running softwares and meets the design requirements.