QNX based DCS Unique Value Proposition

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QNX based DCSUnique Value Proposition

• Igor V. Lapko (lapko_at_rts.ua)

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Which code is more reliable ?
Code A
Code B

• Ask the question !
• What is the code length ?
• How long/thoroughly it was tested ?
• Is it vulnerable from outside ?

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Traditional OS Architecture
Protection among kernel components is absent !
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QNX OS Architecture
Tiny microkernel, refined for 20 years
Hardware protected address spaces!

QNX it is 99.999 of availability (or 5
minutes of downtime annually !)
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Real Time
All delays are specified and are in hundreds of
nanoseconds range
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Why QNX?

• QNX was intentionally developed for real time and
  mission critical applications rather than it was
  adopted for it
• Advanced and reliable scheduling. Bullet proof
  preemptive multitasking. Priority inheriting .
  All abovementioned enables the coexistence of
  control functions with HMI and DBMS functions at
  the same CPU core.
• True microkernel. Perfect MMU.
• Ability to restart every software component
  without system rebooting enables software
  watchdog functions.
• Fault protected file system. Multiple redundant
  network connections.
• POSIX-compatible. Very predictable, reliable and
  robust. No viruses.

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Software Architecture
QNX based DCS, generalized node architecture
Multimedia HMI
WEB Server
OPC Server
SQL Database (MySQL,Empress)
QNX microkernel
IEC-61131 Engine(S3)
Distributed I/O Drivers
Local I/O Drivers
Gateway
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Software Architecture
PAC features
SCADA Workstation

• Extended programming capabilities
• Extended communication options
• Extended database options
• Extended HMI

Operator Panel
PAC
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Communications

• Availability of PACs data in any networks
• Fieldbus adapters (PROFIBUS DP/FMS/FDL, CAN, LON,
  ASI, INTERBUS) from many vendors (Allen Bradley,
  Comsy, Echelon, Engenuity Systems, Inova
  Computers, PEP, Phoenix Contact, Siemens,
  Softing, SST, TMG i-tec, VISTA Electronics , etc)
• Full TCP/IP support and concomitant protocols
  (FTP, HTTP, ODBC, SNMP ? ?. ?.)
• Communication with MS Windows SCADAs via OPC

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DBMS

• It is possible to store data directly in PAC now
• ERP/MES integration via ODBC/JDBC and
  replication
• Popular DBMS support (MySQL, PostgreSQL Empress)

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HMI and WEB HMI

• PAC itself can provide full featured HMI now.
• It can realize complex graphical objects
  including animation and Flash objects
• Even Apache server runs at PAC providing full
  featured WEB HMI

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Software Architecture
DCS architecture
Redundant fault tolerant network
S3
S3
S3
Watch dog
HMI
OPC
SQL
QNX
QNX
QNX
SL
WEB
I/O
I/O
I/O