Developing a Powerful HMI Application Using NI Hardware and Windows Embedded Software

8/12/2019 Developing a Powerful HMI Application Using NI Hardware and Windows Embedded Software

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Developing a Powerful HMIApplication Using NI Hardware and

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Andrew Mierau

Project Engineer


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Definition of: HMI(Human Machine Interface) The user interface in a

manufacturing or process control system. Itprovides a graphics-based visualization of an industrialcontrol and monitoring system. An HMI typically residesin an office-based Windows com uterthat

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communicates with a specialized computer in the plantsuch as a programmable automation controller (PAC),programmable logic controller (PLC) or distributedcontrol system (DCS).

PC Magazinehttp://www.pcmag.com/encyclopedia_term/0,2542,t%3DHMI&i%3D44300,00.asp


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Why Would I Choose Windows?

Graphical User Interface Extensive driver and application support

Complete tool chain Well documented APIs

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Extensive hardware support

Fast time to market

Standard conformity

Extensibility (no-closed box)

Built-in manageability Localized language support


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Why Wouldnt I Choose Windows?

Large footprint Only x86 Support

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Perceived quality issues

Not reliable

Not resilient

Not stable


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What can developers do to create a reliable,custom HMI solution based on Windows?

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Step #1

Pick the correct version of Windows for your use-case

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Windows Embedded Overview

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National Instruments Windows Offerings

Windows Embedded Enterprise x86-based development systems

PXI(e) Controllers

Rack Mount Servers

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n ows an n ows Windows Embedded Standard x86-based deployment systems

cRIO-908x

TPC-22xx Windows Embedded Standard 7 (WES7)


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Windows Embedded Standard 7 (WES7)

Modularized version of Windows 7 Ultimate Binary Compatibility with Windows 7 Ultimate

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Reduced operating system size

Embedded Enabling Features


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Modularized

WES7 1 Embedded Core Package

150 System Packages

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37 Language Packages

Windows XP Embedded/WES2009 10,000 Components

1,000 OS Components 9,000 Driver Components


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Compatibility

Windows API Support Any application that runs on Windows 7 Client can also

run on WES7*

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n ows r ver uppor Existing Windows 7 Client drivers will work on WES7*

*Provided the correct packages are included in the image


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Footprint

Minimum Configuration 550MB

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Typical Configuration

~1.4GB

Nearly Identical to Windows 7 experience Default Windows 7 OEM install is 16GB!!


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Recommendation #1

For Windows-based HMI systems, NationalInstruments recommends using Windows

Embedded Standard 7

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Step #2

Utilize features available in the OS

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Embedded Enabling Features (EEF)

Specifically targeted to embedded customers Unique to Windows Embedded Standard

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Target specific use-cases


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Enhanced Write Filter (EWF)

Benefits Protects a volume from write access

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Volume writes are not persistent across reboots

Extends life of flash media

Protects against malicious or unintended changes tothe system


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EWF in Detail

Upper filter driver in

the volume stack thatis located between the

file system and the

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interface with the

physical disk


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EWF Commands

Enable* Disable*

Commit*

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Commit and Disable* Commit and Disable Live

*Requires reboot


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Enhanced Write Filter (EWF)

Limitations

Not ideal for data logging Persistent data should be logged to unprotected partitions,

removable devices or network locations

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emory sage Memory usage should be monitored

Virtual Memory (Page File) is not recommended

Normally requires reboots Normally set up during development/maintenance

Requires Administrative privileges


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Hibernate Once, Resume Many (HORM)

Benefits Always boot to the same hibernation image

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Ideal for Kiosk-type applications

Once active, hibernate normally to create a resume

point


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Hibernate Once, Resume Many (HORM)

Limitations Requires EWF on all mounted, fixed disks

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Persistent data should be logged to removable devices ornetwork locations

HORM state lost when committing EWF

Inherits all limitations of EWF


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File Based Write Filter (FBWF)

Benefits

Protects the disk against write access at afile/directory level as opposed to the volume level in

EWF

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Selective write through Exclusion List for files/directories

Selective commit/restore

Limitations

Does not support HORM


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FBWF Commands

Enable* Disable*

Add/Remove Volume*

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Add/Remove Exclusion* Commit/Restore

*Requires reboot


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Controlling EEF

LabVIEW Utility LabVIEW API

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EWF and HORM Demo

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Recommendation #2

Utilize Embedded Enabling Features to increasereliability and stability when they fit your end

use-case

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Step #3

Customize the OS to meet project requirements

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Automatic Restart on System FailureControl Panel -> System ->

Advanced -> Startup and

Recovery

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User Interface

Background Change Logon Background

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backgroundDefault.jpg

Must be less than 256KB in size


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User Interface

Auto Logon HKLM\Microsoft\Windows

NT\CurrentVersion\Winlogon\

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AutoAdminLogon DefaultUsername

DefaultPassword


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User Interface

Cursor Make cursor transparent

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Auto-hide or lock

Startup

Put a shortcut to your application in Startup


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Shell Replacement

Replace the Explorer, Windows shell

Per System

HKLM\Microsoft\Windows

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NT\CurrentVersion\Winlogon\Shell Per User

HKCU\Software\Microsoft\Windows

NT\CurrentVersion\Winlogon\Shell

Always have a way to execute Explorer.exe


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Customization Demo

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Recommendation #3

Customize your solution for your users specificneeds.

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Conclusions

WES7 is ideal for HMI applications Utilize EEF to make your system more reliable

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Customize your solution for your users specific

needs


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Developing a Powerful HMI Application Using NI Hardware and Windows Embedded Software

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