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Solving the Issue of Interoperability among Devices and Systems

Solving the Issue of Interoperability among Devices and Systems. ISA100 Wireless Solutions Summit 19 May 2008. Presenter. David D. Brandt Principal Engineer Rockwell Automation Advanced Technology – Milwaukee ddbrandt@ra.rockwell.com. About the ISA100 Standard Activity.

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Solving the Issue of Interoperability among Devices and Systems

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  1. Solving the Issue of Interoperability among Devices and Systems ISA100 Wireless Solutions Summit 19 May 2008

  2. Presenter • David D. BrandtPrincipal EngineerRockwell AutomationAdvanced Technology – Milwaukeeddbrandt@ra.rockwell.com

  3. About the ISA100 Standard Activity • Multiple protocol support on a single, integrated wireless network (ISA100.11a): • ISA100.11a native • HART® • FOUNDATION™ Fieldbus • PROFIBUS • Modbus® • CIP™ • Others • Multiple radio support in a family of standards (ISA100): • Process Automation (Process Focus) • Factory Automation (Discrete Focus) • Transmission and Distribution (Long Distance Focus) • RTLS/RFID (Industrial Tagging Focus)

  4. Control Systems Engineering Tools Asset Management MixedAutomationSystems Historians EmbeddedWirelessDevice Other applications Gateway MixedWired andWirelessDevices WiredDevice WirelessAdapter Challenge: How to provideInteroperability among Devices and Systems? HART®, FOUNDATION™ Fieldbus, PROFIBUS, Modbus®, CIP™, ... HART®, FOUNDATION™Fieldbus, PROFIBUS, Modbus®, CIP™, ... ISA100.11a,WirelessHARTTM,ZigBee®,…

  5. A specific challenge:ISA100.11a / WirelessHART™ Interoperability • ISA100-WirelessHART Joint Analysis Team (JAT) addressed this issue • The ISA100.11a draft standard has followed the recommendations for release 1: • Enable dual-mode gateways • Develop a “common high-side interface” in the gateway • As a common model and interface for mixed systems and devices • Base the interface on the WirelessHART™ optional XML interface • Specify as an implementation neutral Service Access Point • Provide enhanced tunneling for application layer protocols • Provide generic wireless network management that is separate from the application protocols • Provide information to facilitate coordination of RF usage • Convergence below the gateway will be considered for later releases

  6. Control Systems Engineering Tools Asset Management Historians “Other” e.g., Bluetooth®, ZigBee®, etc. Coexistence Features and Functions WirelessHART™ ISA100.11a Multimode Gateway withCommon High-side Interface Other applications Protocol translator and stack to communicate with plant network of choice Common High-side Interface “Other”specific interfaces ISA100.11a Stack (PHY through APP) WirelessHART™ Stack (PHY through APP) Other Stack… WirelessHART™specific interfaces ISA100.11a specific interfaces

  7. Gateway ServiceAccess Point (GSAP) • Session • Lease • Messaging • Publish/subscribe • Client/server • Source/sink • Bulk transfer • Alert • Reports • Device List • Topology, Schedule • Device Health, Neighbor Health, Network Health • Time Synchronization • Gateway configuration This is the Common High-side Interface used by protocol translators.

  8. Control Systems Engineering Tools Asset Management EmbeddedWirelessDevice EmbeddedWirelessDevice WiredDevice WiredDevice WirelessAdapter WirelessAdapter GSAP: Session Service Protocol translators act on behalf of plant applications to establish sessions with the gateway entity through the GSAP session service. Sessions allow resource allocation for a specific network. Resources are reclaimed when a session ends. Session Translatingproxy ProtocolTranslator Gateway GSAP Gateway Entity

  9. Control Systems EmbeddedWirelessDevice WiredDevice WirelessAdapter GSAP: Lease Service Protocol translators act on behalf of plant applications to establish leases within sessions to allocate specific communication resources. Leases allow dynamic resource allocation and release. Resources are allocated within the gateway entity, the network, or both. Specific types of leases are available for: publish/subscribe, client/server, bulk transfer and alerts Lease Translatingproxy Protocol Translator GSAP Gateway Entity

  10. GSAP: Messaging Services Translatingproxy Message Services BulkTransferClient Protocol translators act on behalf of plant applications to utilize lease-based messages services to perform messaging that supports protocol translation. Protocol specific application content is carried in the messages. Publish Subscribe Client Server Alert Buffer Buffer • Large item transfer • Reliable, in-orderdelivery Buffer Buffer Buffer Buffer • Change of state delivery • Local caching • Synchronization • Optional caching Buffer Buffer Alert Subscribe Publish Server Client BulkTransferServer

  11. GSAP: Report Services CommonReports Translatingproxy Protocol Translator Common reports available, independent of the underlying wireless technology. Gateway GSAP Gateway Entity Report Generation

  12. Control System GSAP: Device List Report Service Protocol translators present each wireless device as if it were a wired device within the plant network. The device list report service allows the wireless devices to be discovered and mapped into the plant network, ultimately linking to the control strategy. Each device has a globally unique identifier. EDDL and other device description methods extensions can enable linkage without additional tools. PlantNetwork Proxy1 Proxy2 Proxy3 Proxy4 Protocol Translator GSAP Gateway Entity

  13. Control Systems Asset Management GSAP: Health Report Services Health reports are available to alert control systems to underlying problems in a generic manner. Health reports are also available to asset management systems for maintenance purposes. Protocol translators are responsible for conversion to specific formats. Translating proxy Protocol Translator DeviceHealth NeighborHealth NetworkHealth Gateway GSAP Gateway Entity Report Generation

  14. Engineering Tools GSAP: Topology Report Service,Schedule Report Service Topology and Schedule reports enable the ability to “drill down” when a Health report indicates a communication problem. When devices from different types of wireless networks share the same physical space, channel and transmission schedule can be evaluated for coexistence improvement opportunities. Translating proxy Protocol Translator Topology Schedule Health GSAP Gateway Entity Report Generation Errors Errors Time,Channel Network 1Node 1 Network 1Node 2 Time,Channel Network 2Node 1 Network 1Node 2

  15. Clock Source GSAP: Time SynchronizationService Services are available to synchronize underlying wireless networks to an external source. This is useful when the same source is used in a control system. This is also useful to synchronize wireless device communication across wireless networks. Protocol translators can adapt a variety of sources. Translatingproxy Protocol Translator Gateway GSAP Gateway Entity Time Synchronization

  16. Control Systems Control Systems Control Systems EmbeddedWirelessDevice Example wireless deviceintegration scheme FOUNDATION™FieldbusApplication HART®Application PROFIBUSApplication MultipleSystems A single wireless device (single catalog number) can operate across multiple systems. A specific protocol translator is required in the gateway for each system. ISA100.11a provides an efficient application model that native devices can use for this purpose. Translatingproxy Translatingproxy Translatingproxy MultipleProtocolTranslators Gateway GSAP Gateway Entity SingleGenericDevice

  17. Control Systems Control Systems Control Systems WiredDevice WiredDevice WiredDevice WirelessAdapter WirelessAdapter WirelessAdapter Example wired deviceintegration scheme FOUNDATION™FieldbusApplication HART®Application PROFIBUSApplication MultipleSystems Wired devices can operate across multiple systems. A simple protocol translator is required in the gateway to tunnel each protocol. Adapters must also implement the tunnel protocol. ISA100.11a provides an efficient tunneling model that can be used for this purpose. Translatingproxy Translatingproxy Translatingproxy TunnelingProtocolTranslators Gateway GSAP Gateway Entity SingleDevice

  18. Control Systems Conserving battery life:Minimizing transactions with caching Caching reduces transactions (increasing battery life). Caching gives immediate response to application if used properly. Both ISA100.11a native messaging and tunneled messaging utilize cache techniques. PlantNetwork Informationis routed throughgateway cache Gateway Buffer Buffer Native Information TunneledInformation

  19. Control Systems WiredDevice WirelessAdapter Conserving battery life:Reducing header sizes PlantNetwork ApplicationContent PlantNetwork WiredPacket Address Length Data IntegrityCheck Gateway MAP CARRY CREATE CREATE WirelessPacket Address Length Data IntegrityCheck CARRY MAP CREATE CREATE TunneledDeviceWiredPacket Address Length Data IntegrityCheck Enhanced tunneling reduces the size of packets (increasing battery life) via a “configuration agreement” to map and create fields rather than carrying them. ISA100.11a native messaging provides numerous mechanisms to reduce header size.

  20. Benefits to Users • Protects investment in legacy devices and protocols • Reduces the lifecycle cost associated with gateways • Acquisition cost (less gateways) • Training and Maintenance cost (common gateway model) • Provides a future migration path • For wired devices • For improved wireless technology • First step on path to more complete integration with WirelessHART™, anticipated to be upgradeable to “Release 2” approach without impacting higher level applications

  21. Benefits to Vendors • Reduces development cost and time • Design to a common gateway model • Independent of plant network • Independent of low-power wireless network • Single paradigm fits both ISA100 and WirelessHART™ architectures • Enables value-added integration enhancements • E.g., time synchronization across networks • E.g., coexistance coordination tools

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