Niveau: Supérieur, Doctorat, Bac+8
Convergence of Smart Objects in industrial wireless sensor network (Smart Object Security Workshop 2012) Kazunori Miyazawa Yokogawa Electric Corporation Introduction 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. Control cycle depends on target processes or materials and every PACS needs realtimeness. The control cycle is 1 Hz in general and sometimes more faster 4 Hz. As mentioned above, PACS processes hazardous materials which are sometimes explosive. Hence field devices such as sensors and actuators must be intrinsically safe and low power consumption, capacitance and inductance are seriously restricted. Network for PACS usually equips redundancy due to the high reliability requirements. Huge plant has tens of thousands of I/O points and over a ten thousands field devices.
- analog communication
- draft-garcia-core-security
- devices
- production phase after
- pacs
- can relax
- summary pacs
- end communication