The model XY242-300 explosion-proof HMI is a small explosion-proof human-machine interface used together with PLCs or intelligent controllers with communication ports that monitors the operation by means of words or indicators by changing the status or value of the registers or relays inside the PLCs so that the operators may control the machinery & equipment freely. The HMI may communicate with most existing PLCs used today, including Siemens, Mitsubishi, Omron, Panasonic, Schneider, Fatek, LG, Delta and AB. It is widely used for the machinery /equipment control systems or automatic control systems of the machinery/equipment production lines in hazardous locations with explosive gases and dust in a wide variety of industries including petroleum, chemical, light textile, pharmaceutics, mining machinery, metallurgy and electric power, etc.