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Convergence of Smart Objects in industrial wireless sensor network Smart Object Security Workshop Kazunori Miyazawa Yokogawa Electric Corporation Kazunori yokogawa com 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 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 Hz in general and sometimes more faster 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 So that field devices and their engineering are cost sensitive If once a plant starting up and becoming production phase after construction the equipments are hardly changed and they are used years or years long The system is very static and it has long life cycle Construction and engineering of PACS are executed in parallel to shorten the time to build a plant In a user site the construction is carried out according to physical design The devices are directly delivered ...

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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


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Convergence of Smart Objects in industrial wireless sensor network (Smart Object Security Workshop 2012) Kazunori Miyazawa Yokogawa Electric Corporation Kazunori.Miyazawa@jp.yokogawa.com 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. So that field devices and their engineering are cost sensitive. If once a plant starting up and becoming production phase after construction, the equipments are hardly changed and they are used 20 years or 30 years long. The system is very static and it has long life cycle. Construction and engineering of PACS are executed in parallel to shorten the time to build a plant. In a user site the construction is carried out according to physical design. The devices are directly delivered to a user site and deployed. On the other hand, control systems are implemented in a system vendor and delivered to a user site after the construction. These parallel works requires logical identifiers that are human readable to bind a logical information to a physical device. The identifier called “tag” or “device tag”. In a user site the device tags are manually installed into devices in deployment phase. In a system vendor, control logic and communication configurations are implemented using the device tag to bind them at the user site. PACS is operated under a single authority as contrasted with the situation of building automation (BA) or Smart Grid system where some authorities share systems. For instance an owner of a building and residents share permission to access lights and HVAC systems in BA and a power supplyer and clients share monitoring systems in SmartGrid. The operators of PACS are experts of chemical process and plant operation but not IT or network technologies. The operators believe that behavior of PACS is deterministic and predictable in any situation. The requirements for wireless network security are basically same as other automation systems such as BA, HA and Smart Grid. But the security should be along with requirements and features of PACS, which are mentioned above.