MicroNet TMR Control System for Turbines and Compressors


Woodward's MicroNet TMR (Triple Modular Redundant) controller is a customizable digital control platform that reliably controls and protects steam, gas turbines, and compressor trains used in system-critical applications where the chance of a safety issue or large economic loss may be possible.

MicroNet TMR’s superior architecture and diagnostic coverage combine to create a system with 99.999% availability and reliability. The MicroNet TMR can be applied as a component of protection and safety systems to allow the overall system to meet IEC61508 SIL-3 compliance standards. IEC61508 calculations and application assistance are available upon request. 

As an independent company, Woodward and our partners are able to provide full service, support and upgrades. We take great pride in customer support and continue to support fielded products for as long as parts are available. When upgrades are required, our OEM and Channel Partners are able to provide upgrade services on all controls.

Through standardization and attention to software evolution, Woodward’s partners are able to adapt 1990’s software into today’s advanced control platforms with minimal or no changes required. Our world class software environment allows for updates to be done in GAP or imported as single blocks from other commonly used software environments including Matlab, C++, etc.


Operating Conditions

  • Temperature (0 to 55) °C / (32 to 131) °F ambient air temperature range
  • Shock US MIL-STD-810C, method 516.2-1, procedure 1B
  • Vibration Lloyd’s ENV2 test #1
  • Emissions * EN61000-6-4
  • Immunity * EN61000-6-2
  • Certifications * CE, UL/cUL, CSA (Class I, Division 2), LR for ENV1 & ENV2, ABS, GOST
  • Other International Compliance (with the use of MicroNet Safety Module) TÜV certified for SIL-3 per IEC 61508 Parts 1-7, Function Safety of Electrical / Electronic / Programmable, Electronic Safety Related Systems

MicroNet TMR Chassis —18 slot chassis

  • Mounting Bulkhead mounted or adaptable to 483 mm (19 inches) rack mount back panel
  • Control Chassis Dimensions 478 mm wide x 363 mm high x 307 mm deep
     (18.8 inches wide x 14.3 inches high x 12.1 inches deep)
  • Control Chassis Weight 25 kg (55 lb)
  • Power Chassis Dimensions 163 mm wide x 363 mm high x 307 mm deep
     (6.4 inches wide x 14.3 inches high x 12.1inches deep)
  • Power Chassis Weight: 7 kg (16 lb)

  Power Supply Input Options

  • (18 to 36) Vdc, (100 to 150) Vdc, (88 to 132) Vac / (47 to 63) Hz, (180 to 264) Vac / (47 to 63) Hz

(*) Specifications apply to most components and modules. Some certifications may be pending. Contact Woodward for further information.

Features of the MicroNet TMR include:

  • IEC61508 SIL-3 Certified
  • Cyber secure CPU
  • Simplex or redundant CPU configurations
  • VME-based (Full and Narrow Chassis)
  • Real-time multitasking VxWorks® operating system
  • Woodward’s proven graphical application programmer (GAP) software and supporting tools
  • Deterministic update rates as fast as 5 ms
  • Improved control system availability and reliability
  • SNTP compliant for time synchronization
  • Expandable with redundant realtime network available in CAT-5 or fiber optic configurations
  • Ethernet communications
  • Simplex or dual power supplies
  • Modular I/O
  • Time stamping of events to 1 ms
  • Hot replacement of modules for online repair


Capabilities of the MicroNet TMR include:
  • Speed and load control
  • Temperature and process control
  • Combustion control
  • Anti-surge control
  • System sequencing and package auxiliary control
  • Rigorous load rejection performance
  • Complex DLE fuel control algorithms
  • Incipient surge detection
  • Long-term naval programs
  • Alarm + shutdown communication

Regulatory Compliance 

North American: 

     UL: UL Listed for Class I, Division 2, Groups A, B, C, & D, T3A(UL File E156028)


European Compliance for CE Marking: 

    EMC Directive: 89/336/EEC: EN61000-6-2, EN61000-6-4

    Low Voltage Directive: 73/23/EEC: EN61010-1

    ATEX Directive: 94/9/EC: EN60079-15 (Zone 2, Cat. 3, Group II G, Ex nA [nL] IIC T3 X)


Other European Compliance: 

  Machinery Directive: 98/37/EC (compliant as a component)


Marine Compliance: 

  ABS: ABS Rules 2006 4-9-7/Table 9

  DNV: Temp. Class A, Hum. Class B, Vib. Class B, and EMC Class A

  LRS: ENV1 and ENV2