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ECT 358

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True faith and courage are like a kite an opposing wind raises it higher. ... Complex processors usually don't work alone to accomplish tasks. ... – PowerPoint PPT presentation

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Title: ECT 358


1
ECT 358
  • Lecture 32
  • MicroBlaze Communication

2
True faith and courage are like a kite an
opposing wind raises it higher.
  • But they that wait upon the Lord shall renew
    their strength they shall mount up with wings as
    eagles they shall run, and not be weary and
    they shall walk, and not faint.
  • Isaiah 4031

3
MicroBlaze Communications
  • Complex processors usually dont work alone to
    accomplish tasks. More recently, processors
    accomplish smaller tasks and communicate with
    other processors across a network to accomplish
    the task. This involves steps such as
    handshaking and sequence control.

4
Types of Communications
  • Operator Interface
  • Display Status
  • Multiprocessor Communications

5
Hardware Lines for Communications
  • Data
  • Address
  • Interrupt
  • Handshaking
  • Power/Ground

6
IEEE 1451
  • General Description (1451)
  • History
  • Model Description (1451.1)
  • Communication Interface (1451.2)
  • Applications
  • Manufacturers
  • Available Components
  • Advantages
  • Examples
  • Bibliography

7
General Description
  • IEEE 1451 is an open network independent smart
    transducer interface standard that is universally
    accepted for sensors and actuators.
  • Developed to reduce cost of installing,
    maintaining, and upgrading sensor/actuator
    networks
  • Plug and Play Transducers
  • Digital Network Communications

8
General Description
  • IEEE 1451.0 TEDS/Commands
  • IEEE 1451.1 Object Model
  • IEEE 1451.2 NCAP-Transducer Single Interface
  • IEEE 1451.3 NCAP-Transducer Multi
  • IEEE 1451.4 Mixed Mode Interface (A/D)
  • IEEE 1451.5 B Wireless
  • IEEE 1451.6 CANopen
  • B Ballot Development

9
General Description
10
History
  • Work began on the IEEE 1451 standards in
    September of 1993, when the TC9 Committee on
    Sensor Technology and the National Institute of
    Standards and Technology discussed sensor
    communication interfaces and the possibility of
    creating a standard interface.

11
IEEE 1451.1
  • Transducer application portability (software
    reuse)
  • Plug-and-play software capabilities (components)
  • Network independence (network abstraction layer)

12
IEEE 1451.1 Application Classes
  • An NCAP Block (consolidates system and
    communication housekeeping)
  • A Transducer Block (provides the software
    connection to the transducer device)
  • A Function Block (provides the transducer
    application algorithm (i.e., obtain and multicast
    temperature data every second)
  • Parameters (contains the network accessible
    variables that hold and update the data)
  • Ports (network communication objects for
    publishing and subscribing to information or
    interacting with other NCAPs using client/server

13
Conceptual View of an IEEE 1451.1 NCAP
  • Uses a backplane or card cage concept
  • NCAP centralizes and glues all the system and
    communications facilities together
  • Network communication viewed through the NCAP as
    ports
  • Function block application code is plugged in
    as needed
  • Transducer blocks map the physical transducer to
    the NCAP

14
IEEE 1451.1 Environment Models
  • An Object Model, defines transducer device
    specific abstract objects or, classes with
    attributes, methods, and state behavior
  • A Data Model, defines information encoding rules
    for transmitting information across both local
    and remote object interfaces
  • A Network Communication Model, supports a
    client/server and publish/subscribe paradigm for
    communicating information between NCAPs

15
IEEE 1451.1 Benefits
  • Extensible object-oriented model for smart
    transducer application development and deployment
  • Application portability achieved through agreed
    upon application programming interfaces (API)
  • Network neutral interface allows the same
    application to be plug-and-play across multiple
    network technologies
  • Leverages existing networking technology, does
    not re-implement any control network software or
    protocols
  • Common software interface to transducer hardware
    i/o

16
Communication Interface
Network Interface
Transducer Independent Interface (TII)
17
Transducer Independent Interface
18
TII Pin Assignment and Signal Definition
19
Example of Pin Connection
Characteristics are stored in the EEPROM memory.
The data is stored in the transducer electronic
data sheet (TEDS) format. TEDS format is a
hardware- and vendor - independent method of
storing the information necessary to describe
operating characteristics of a smart sensor,
transducer or actuator.
20
Chief Application Fields
  • Remote Monitoring
  • Remote Actuating
  • Distributed Control
  • Collaborative Measurement and Control

21
Specific Applications
  • Manufacturing
  • Industrial Control
  • Automotive
  • Aerospace
  • Building
  • Biomedicine

22
Manufacturers
  • Though different networks and fieldbuses continue
    to have different protocols and requirements,
    many of the 1500-2000 sensor manufacturers have
    come together on this common interface.
  • Some companies include
  • Boeing Commercial Airplane Group
  • Analog Devices
  • National Instruments
  • Maxim
  • Hewlett-Packard
  • Xerox
  • PCB Piezotronics
  • Electronics Development Corp. (EDC)
  • Wind River Systems
  • Grayhill Inc

23
Available Components
  • HP- 1451.2 Ethernet controllers
  • Analog Devices- 1451.2 compliant chips
  • Electronics Development Corp.- 1451.1 compatible
    Smart Transducer Network System
  • The Modal Shop- acoustic and vibration sensing
    sensors that conform to both 1451.2 and 1451.4
    standards
  • Maxim- Silicon pressure sensors w/TEDS
  • Smart Modal- Smart Isotron Accelerometers with
    1451.4-based TEDS

24
Advantages of Smart Sensors
  • Provides interfacing for many types of sensor
    elements capacitors, RTDs, thermistors,
    resistive bridges and potentiometers and many
    others.
  • Low-cost CMOS with standard input protection.line
    tri-state output.
  • Resolution and accuracy of 13 bits.
  • Simple output signal for easy interfacing with
    any type of micro-controller.
  • Continuous auto-calibration of offset and gain.
  • Suppression of 50/60 Hz interference.
  • Single 3.3-5.5V power supply, current consumption
    below 2.5 mA. (this is being increased to 7.5 mA
    in later revisions)
  • Measurement time of 10 ms or 100 ms typically.
  • Measurement of multiple sensor elements.
  • No additional interface circuitry required.
  • Power down mode
  • Operating temperature range of -30 deg C to 70
    deg C.
  • Self identification
  • Self testing
  • Sensors are self-calibrating
  • Ease of setup

25
Examples (System)
Plug-n-Play Controller
NCAP
STIM
Network
TII
26
Examples (STIM)
Smart Transducer Interface Module
Miniature accelerometer
27
Examples (NCAP)
Network Capable Application Processor
National Instrument TEDS Terminal Block
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