• en

MicroNet TMR Control System

MicroNet TMR Control System

MicroNet TMR Control System


The MicroNet TMR ® (triple modular redundant) controller is an upgrade for NetCon and is a state-of-the-art digital control platform designed to reliably control and protect steam turbines, gas turbines, and compressor trains used in system-critical applications where the chance of a safety issues or large economic losses may be possible. The MicroNet TMR’s 2-out-of-3 voting architecture ensures that correct decisions are made, correct responses are performed, and the prime mover continues to safely operate with or without any single-point failure. This controller’s robustness, accuracy, and availability make it the choice of turbine and compressor OEMs and operators.

The 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. Typical MicroNet TMR application experience and use:

Refrigeration Compressors (Ethylene, Propylene)
Methane and Syn Gas Compressors
Gas Cracker Compressors
Charge Gas Compressors
Hydrogen Recycle Compressors
Critical Turbine Generator Sets
Turbine Safety Systems

For IEC61508 SIL-3 based applications, a safety certified MicroNet Safety Module (MSM) is required as part of the MicroNet system. The MSM functions as the system’s SIL-3 logic solver, and its fast (12 millisecond) response time and integrated overspeed and acceleration detection/protection functionality make it ideal for applications on critical high-speed rotating motors, compressor, turbines, or engines. For more information on the MicroNet Safety Module, refer to Woodward product spec 03375.


The MicroNet TMR ® control platform utilizes a robust rack-mounted chassis with on-line replaceable I/O modules and triple modular architecture to achieve its 99.999% availability. This triple modular redundant based system consists of three isolated kernel sections (A, B, C) housed within the platform’s compact chassis. Each kernel section includes its own CPU, CPU power supply, and up to four I/O modules. The I/O modules can be used for simplex I/O, redundant I/O, triple redundant I/O, or any redundancy combination. I/O expandability is performed via additional system chassis or through distributed I/O.

This platform’s high-density modules and integrated application program provide first-out indication for monitored system events to reduce troubleshooting time. These purpose-built modules time-stamp discrete events within 1 millisecond and analog events within 5 milliseconds. The MicroNet TMR uses two power supplies, each of which powers the control from a separate power source. Inside each power supply are three independent power converters, one for each CPU and I/O section. This triplicate power architecture provides maximum protection against single or multi- point hardware failures.

The control’s special TMR Discrete I/O modules are designed for use in critical discrete circuits. This module accepts discrete inputs and distributes these inputs to each of the separate kernel sections, as well as output relay-based contacts to drive discrete application logic. The module’s special TMR outputs utilize a six-relay configuration and integrated latent fault detection logic to allow the failure of any one or in some cases two relays without affecting the integrity of the output contact. This type of architecture allows routine relay testing to be performed as well as on-line reparability, without affecting the integrity of the output or system.

Designed as a turbine control system, the MicroNet TMR controller’s actuator driver modules are designed to interface with proportional or integrating turbine valve servos using single or dual redundant coils, with AC or DC feedback position sensors. The MicroNet TMR control can accommodate any combination of Woodward standard MicroNet I/O modules to provide maximum application flexibility.

Available Inputs and Outputs include:

  • Magnetic pickups (MPUs) and proximity probes
  • Discrete I/O
  • Analog I/O
  • Thermocouple inputs
  • Resistance temperature devices (RTDs)
  • Proportional and integrating actuator drivers (integrated AC and DC position inputs
  • Ethernet and Serial communications

If you need to upgrade your NetCon to MicroNet Plus, or need to order, repair, retrofit or customize a solution for your NetCon or MicroNet Plus Control System, call us at 877-544-5201.

MicroNet TMR Control System

Product Specification 03363


  • IEC61508 SIL-3 Certified
  • Superior reliability and availability
  • Unmatched diagnostics
  • Deterministic scan rate using synchronized I/O
  • On-line repairable
  • On-line software changes
  • No single points of failure
  • High density I/O modules
  • IEC61131 programming tools
  • OEM qualified algorithms
  • Interfaces to all major DCS systems
  • Engineering, installation, and training services

Fact sheet

Download PDF
Share On Facebook
Share On Twitter
Share On Linkedin
Contact us