Convergence of Smart Objects in Industrial Wireless Sensor Network (smart Object Security Workshop 2012)

Process Automation Control System (PACS) requires high reliability because it processes hazerdous materials, which are often explosive and toxic. PACS has been mainly using 4-20mA analog communication overlaying on power supply because of its high reliablity. This analog communication needs one line to transmit to single value and it is uni-directional. Brand new PACS introduces field bus network for communication between control systems and sensors. It is bi-directional digital communication and achieves to share a communication line with some devices. So far PACS mainly uses wired communication but demand for wireless communication increases due to the cost merit. The purpose of wireless communication is mainly monitoring at this moment. Some users expect to extends it to more critical purpose such asI/Os of control loops.