1. NeSSI Update
An Implementation of the Generation 2 Bus Siemens Activities
November 2006

2. Topics Summary Siemens activities Review of key bus requirements
Current status of Siemens implementation

3. Summary of Siemens Activities
Siemens is implementing a large analyzer system project
Owner has requested NeSSI Generation 2 sampling systems
Siemens is proposing an implementation
Compliant with project time frame
Based on available technology but consistent with long term NeSSI vision
Cooperative with major substrate and component suppliers

4. Initial Implementation “Smart” analyzers
Smart modular process sample conditioning implementation through the cooperation of:
Siemens
CIRCOR Instrumentation Technologies
Parker Hannifin
Swagelok
Siemens Maxum edition II GC with integrated NeSSI Generation 2 Bus Control capability.
I.S. Power Supply
Intrinsically safe, Generation 2 Bus V P T A
Sampling systems built with substrates and smart, Generation 2- compatible components.
SAM functionality is integral to the analyzer

5. Initial Implementation “Dumb” analyzers
Continuous Gas Analyzers with system control and network integration provided by Siemens Network Access Unit (NAU) with integrated NeSSI Generation 2 Bus Control capability.
I.S. Power Supply
Intrinsically safe, Generation 2 Bus V P T A
Sampling systems built with substrates and smart, Generation 2- compatible components.
SAM functionality is external to the analyzer

6. Review of Key Generation 2 Requirements Pieces Of the NeSSI Idea
New mechanical components
Modular
Standardized mounting platform
Interchangeable function
New electrical interconnection
Serial connection – plug in
Intrinsically safe
Self-identifying components
New smart design features (SAM)
Helpful HMI
Programmability
Standardized, transportable user programming
Complete;
Available from a variety of suppliers.
Lots of discussion. Various standards considered; none adopted.
Various implementations are possible.

7. Key Bus Physical / Functional Requirements
Sampling
System
Sampling
System
Sampling
System
Analyzer
Analyzer
Analyzer
Analyzer House (typical)
Note: ** Often, sampling systems are mounted separately from related analyzer. ** Some systems mounted attached to analyzer.
Analyzer may be up to 10m from sampling system. Total cable length <=20m
Number of bus “instances” to be limited to simplify analyzer control and reduce cost; <= 2 instances preferred, excluding power sources
Bus to support very large number of participating component and analyzer suppliers (unlimited ~ >1000’s)
Bus to provide for sensing and control of: valves, pressure, flow, temperature
Component power to be supplied via bus (rather than separate power bus) to simplify I.S. and physical issues
Analyzer
Local Power and Air

8. Key Bus Physical / Functional Requirements (Continued)
Components to be mounted in Division 1 / Zone 1 hazardous area.
Bus to be intrinsically safe and to support components mounted in hazardous area
Design goal for flammability ignition temperature to be T4 (135°C) with minimum at least T3 (200°C).
Component ambient temperature to be >=70°C
Sampling system to be capable of supporting at least 30 separate streams
Bus to support at least 200 component / functional instances
Bus to support component types in any combination up to the total number of components in the system.
Bus to support at least 4 simultaneously active valves
Bus to supply necessary component power management functions
Bus to support replacement of components while live without interruption of bus operation
Bus to provide for control of high-power components that do not draw power from the bus itself (eg. heaters)
Interior of cabinet is considered hazardous due to leakage of flammable gases in a closed area.
Mounting area may be hazardous or not.
Note: Requirements listed in no particular order.

9. Key Bus Requirements Functions Defined by Bus
Method of human interface for SAM.
External communications
Bus must provide a method for analyzers to get “on” the bus.
Bus must provide a method for components connect “to” the bus…
Analyzer
SAM
“SAM” may be either a physical device or a software implementation in the analyzer. V T P A

10. Status of Siemens Implementation Overview
I.S. Power Supply(ies)
As needed…
Media Access Controller Chip (chip spec and burn image by Siemens; assembly by component manufacturer)
Intrinsically Safe NeSSI Generation 2 Bus
Bus buffer and I.S. barrier
Existing I/O Link with proprietary protocol
Siemens GC
Mechanical component
Component interface electronics (by component manufacturer)
Substrate

11. Status of Siemens Implementation
Analyzer and software
Communications Software / Protocol: existing proprietary, complete
External bus
Buffer / drivers and I.S. barriers: in test
I.S. certification: preliminary review complete
EMI / RFI testing: bus validation proven; components pending
Robustness, bit error rate testing: bus validation proven; components pending
Components
Media Access Controller chip: Version 1 operating in test
Component interface and software: in test
I.S. certification: pending
Component functions: in test
Field Schedule
Live demonstration at engineering facility: November 2006
Planned field delivery: 2007
Compatibility with NeSSI Vision
Direct implementation of NeSSI concept; meets all key requirements
Architecture consistent with other Bus technologies currently being considered (CAN, Fieldbus, Profibus)