1. IFPAC-NeSSI Report.ppt; 29 January 2008; Slide 1Siemens Energy & Automation, Inc. Criteria for Design and Specification NeSSI Issues Presentation to IFPAC Regarding NeSSI Generation 2 Bus January, 29, 2008 Bob Farmer

2. IFPAC-NeSSI Report.ppt; 29 January 2008; Slide 2Siemens Energy & Automation, Inc. Topics  Overview; terminology  Design criteria –System issues –Bus and cabling –Components  Product and marketing issues

3. IFPAC-NeSSI Report.ppt; 29 January 2008; Slide 3Siemens Energy & Automation, Inc. Basic Bus Configuration and System Concept V T P A Controlling Unit (SAM) BBBB

4. IFPAC-NeSSI Report.ppt; 29 January 2008; Slide 4Siemens Energy & Automation, Inc. Extended System Concept V T P A Controlling Unit (SAM) BBBB DC Power AC Power ? ?

5. IFPAC-NeSSI Report.ppt; 29 January 2008; Slide 5Siemens Energy & Automation, Inc. Extended System Concept V T P A Controlling Unit (SAM) BBBB DC Power AC Power B B Cabinet System Environment Ambient Environment

6. IFPAC-NeSSI Report.ppt; 29 January 2008; Slide 6Siemens Energy & Automation, Inc. SAM – including Bus source and software Component Electrical Implementation NeSSI Substrates Proprietary mechanical NeSSI component by component vendors Bus including drivers and power source Proprietary component-specific electronics by component vendor Bus electronics; Intrinsic Safety barriers; and Standardized interface to component electronics Assembly and certification of the complete component Bus Definition Point of Bus Interface Substrate Definition Point of Substrate Interface

7. IFPAC-NeSSI Report.ppt; 29 January 2008; Slide 7Siemens Energy & Automation, Inc. Design Criteria  System  Bus and Cable  Components

8. IFPAC-NeSSI Report.ppt; 29 January 2008; Slide 8Siemens Energy & Automation, Inc. System Design Criteria  Overall system configuration and size –Minimum –Typical –Maximum  Ambient environment –Impact on bus external to system enclosure  System environment –Impact on bus internal to system enclosure –Impact on components and devices in system  Component capabilities and requirements –Power issues –Native capabilities and implementation methods regarding safety concerns –Market volume: available development resource commitment and impact on bus interface development

9. IFPAC-NeSSI Report.ppt; 29 January 2008; Slide 9Siemens Energy & Automation, Inc. Bus Design Criteria  Capacity –Number of devices –Types of devices –Participating suppliers  Physical Issues / Installation –IP ratings / protection –Ambient conditions –Certifications / safety –Chemical resistance  Electrical –Length –Installed base / compatibility –Load capacity / load management –Power distribution –Interruption / interchange –Reliability / EMI / RFI –Instances / continuity  Software –Device representation –Device function –Maintenance issues –Configuration / addressing / identity Component ambient temperature to be >=70°C Design goal for flammability ignition temperature to be T4 (135°C) with minimum at least T3 (200°C). Capability for the standard functions to be implemented in a variety of ways. Number of components on bus: Typical: 5-15 Common: 20-30 Maxum: 200 Power Requirements: Sensors: 10-40ma Controllers: 20-70ma Valve pilots: 80-350ma

10. IFPAC-NeSSI Report.ppt; 29 January 2008; Slide 10Siemens Energy & Automation, Inc. Cabling Issues  Cable size, bend radius, height  Connection methods and system design  Jacket materials  Cost

11. IFPAC-NeSSI Report.ppt; 29 January 2008; Slide 11Siemens Energy & Automation, Inc. Component Design Criteria  Primary component performance  Physical size and shape  Mounting constraints  Power consumption  Diagnostic support  Ambient and physical ratings (see also Bus and Cabling)  Chemical and atmospheric tolerance (see also Bus and Cabling)

12. IFPAC-NeSSI Report.ppt; 29 January 2008; Slide 12Siemens Energy & Automation, Inc. Other Product Marketability Issues  System responsibility –Supplier: Integrator, component manufacturer, bus provider –System elements: Bus master, components, cables and peripherals –Field support –Training –Configuration and implementation difficulties –Issues with interchangeability  Spare parts and long term support –Field diagnosis and repair plan –Component support life: longevity in a “capital” investment versus short life span of electronic and software techniques

13. IFPAC-NeSSI Report.ppt; 29 January 2008; Slide 13Siemens Energy & Automation, Inc. Questions - Discussion