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

IFPAC-NeSSI Report.ppt; 29 January 2008; Slide 1 Siemens Energy & Automation, Inc.

Criteria for Design and Specification

NeSSI IssuesPresentation to IFPAC Regarding NeSSI Generation 2 Bus

January, 29, 2008Bob Farmer


Topics

Overview; terminology

Design criteria– System issues

– Bus and cabling

– Components

Product and marketing issues


Basic Bus Configuration and System Concept

VTP

A

Controlling Unit (SAM) B B B B


Extended System Concept

VTP

A


DC Power

AC Power

?

?


Extended System Concept

VTP

A


DC Power

AC Power

B

B

Cabinet

System Environment

Ambient Environment


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


Design Criteria

System

Bus and Cable

Components


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


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: 5-15Common: 20-30Maxum: 200

Power Requirements:Sensors: 10-40maControllers: 20-70maValve pilots: 80-350ma


Cabling Issues

Cable size, bend radius, height

Connection methods and system design

Jacket materials

Cost


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)


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


Questions - Discussion

Documents

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