Triple modular redundancy continuous time markov chains. Each version is expandable into multiple chassis as required by the system size and will support any mix of io, including networked, distributed io. Output field termination unit oftu the output field termination unit oftu is the section of the io module that connects all three aofius to a single field interface. Trusted uses control to minimize system trips and provides high availability, fault tolerance and failsafe features as part of its intrinsic, safetyrelated functionality. Triple modular redundancy verification via heuristic netlist. Localized triple modular redundancy ltmr redundant data path. This paper presents an innovative method that allows the use of dynamic partial reconfiguration combined with triple modular redundancy tmr in srambased fpgas faulttolerant designs. Triple modular redundancy layerzero power systems, inc. Triple modular redundancy verification via heuristic netlist analysis giovanni beltrame polytechnique montreal, montr. Trusted tmr 24 vdc digital input module 40 channel. Pdf on the optimal design of triple modular redundancy. Redundant copies of only a reduced set of luts are created to introduce seu immunity. The triplemodularredundant tmr configuration is considerably different from the triple redundancy outline because it employs three identical voting circuits instead of one voting circuit.
Increased clock frequencies, higher transistor counts, lower voltage levels, and reduced noise margin have exponentially raised performance of modern microprocessors but made processors more vulnerable to soft errors. N vijaykrishnan department of computer science and engineering pennsylvania state university usa. Reliability analysis of triple modular redundancy system. Whatever you prefer to call it power supply, rectifier, power system, power module, power brick we make millions of different kinds that can be used in thousands of different applications including electronic equipment, manufacturing, machinery, process control, factory automation, astrophysics, chemical processing, telecommunications, monitoring. For example, a typical triple modular redundant computer system may employ three processors. Us6141769a triple modular redundant computer system and. The system needed to be implemented in lockstep so that a. Abstract triple modular redundancy tmr is a common technique to protect memory elements for digital processing systems subject to radiation effects such as in space, highaltitude, or near nuclear. Music so, lets take a look at another example, namely a triple modular redundant system. Reduced triple modular redundancy for tolerating seus in srambased. The trusted tmr 120 vdc digital output module interfaces to 32 field devices.
This device accurately monitors turbine rotor speed and acceleration. This document addresses the protection of random sequential and combinatorial logic. We will focus on some of the most commons and we will have occasion to study them more deeply in a future post. The 2300d hics is built on the same advanced technology as 2300t, for a dualredundant solution. In this paper, we develop the avtmr all voting triple modular redundancy system that is operated correctly in the case of a fault, and evaluate the. The trusted tmr 24 vdc digital input module interfaces to 40 field input devices. There are similar sounding terms like, tri or triple redundant, used in industry to describe other sts products but they simply do not yield the same, high level of reliability. Triplemodular redundancy with perfect voting circuits figure 2. The classic n modular redundant example is triple modular redundant.
A triple modular redundant digital system for feedwater control and safety application in nuclear power plants 6 the built. Reduced triple modular redundancy for tolerating seus in. The design and evaluation of all voting triple modular. In computing, triple modular redundancy, sometimes called triple mode redundancy, tmr is a faulttolerant form of n modular redundancy, in which three systems perform a process and that result is processed by a majorityvoting system to produce a single output. Triple modular redundancy tmr you can implement tmr technique on critical logic such as state machines. The approach is called functional triple modular redundancy ftmr.
If any one of the three systems fails, the other two systems can correct and mask the fault. Integrated controls we specialize in integration, which solves the hassle of managing multiple black boxes by enabling tmc elements to communicate with each other. The faulted module can be replaced with a new module online without affecting the feedwater system operation. On the optimal design of triple modular redundancy logic for srambased fpgas conference paper pdf available march 2005 with 181 reads how we measure reads. Sonza reorda2 1universidade estadual do rio grande do sul uergs engenharia em sistemas digitais. Triple modular redundancy tmr mastering and implementing tmr into a design greatly increases the complexity and the time it takes to build and debug a system the xilinx tmrtool solution. Fault tolerant air bubble sensor using triple modular redundancy method. Partial evaluation based triple modular redundancy for single. Groups of redundant logic nodes are collapsed into one group. Requires identical system inputs voted before agreeing on the one input set that will be. This document discusses the use of triple modular redundancy tmr for the protection of combinatorial and sequential logic in reprogrammable logic devices. Reduced triple modular redundancy for tolerating seus in sram.
Imagine you have an embedded system which you want to perform very reliably. Fault tolerant air bubble sensor using triple modular. Tmr technique uses three implementation of the same function redundant modules. Fault tolerant computer systems employ redundant elements to guard against system failure. On the optimal design of triple modular redundancy logic for. Triple modular redundancy tmr was the most applied fault masking technique for fault tolerance of software or hardware systems. Any reproduction will not be for commercial use or profit. Triple module redundancy licensing the source and rtl files coming from thalesriscvregistersrouter, thalesriscvjtagrouter, thalesriscvchiselproject and thalesriscvfaultdetector are released under the bsd 3 clauses. Triplicated diagnostic tests are performed throughout the module including measurements for current, and voltage on each portion of the voted output channel. Redundancy sometimes produces less, instead of greater reliability it creates a more complex system which is prone to various issues, it may lead to human neglect of duty, and may lead to higher production demands which by overstressing the system may make it less safe. In this paper, we develop the avtmr all voting triple modular redundancy system that is operated correctly in the case of a fault, and evaluate the avtmr system in the failure rate based on.
Triple modular redundant description the protechgii is an overspeed safety device designed to safely shut down steam, gas, and hydro turbines of all sizes upon sensing an overspeed or overacceleration event. Verification of triple modular redundancy insertion for reliable and trusted systems. In computing, triple modular redundancy, sometimes called triplemode redundancy, tmr is a faulttolerant form of nmodular redundancy, in which three systems perform a process and that result is processed by a majorityvoting system to produce a single output. It is designed to provide maximum safety and system availability. Pdf a fault tolerant voter circuit for triple modular. Aikofahi hereby grant permission to the wallace memorial library of the rochester institute of technologyto reproduce mythesis in whole or in part. Triple modular redundant system was implemented on intel galileo generation 1 as satellite onboard computer development hardware. The project goal was to create a triple modular redundant system using three altera nios ii soft ipcores on a fpga development board for general dynamics c4 systems at its needham, massachusetts location. The hi system, certified compliant with sil3, and showcased to the public at the. In a triple modular redundant t mr system, the robustness of the voter circuit has been improved. On the optimal design of triple modular redundancy logic. To be presented by melanie berg at government microcircuit applications and critical technology conference, orlando, fl, marc h 1417, 2016. The method is often referred to as triple modular redundancy tmr. Redundancy implemented in onboard computer using bash shell script.
Triple modular redundant computer system and associated method download pdf info publication number. A vhdl approach has been developed for automatic tmr insertion and a demonstration design has been developed. A machine with two replications of each element is termed dual modular redundant dmr. This system implemented as hardware fault tolerant system for satellite onboard computer. So in case you have three of these processors such a the system called a triple modular redundant system, three processors, a single voter. The input environment is given in terms of signal probabilities of the lines. Tmr r3,0 3 modules, 0 spares identical modules synchronized to the level of being able to compare and vote on the outputs usually means preplanned, lockstep comparisions. Design and implementation of triple modular redundant. A microblaze tmr subsystem is of fault tolerant fail safe ftfs type, which means that it continues to work without degradation after the first failure ft and will detect a second failure fs. Triple modular redundancy, a proper noun, is a based on proven statistics and stringent mathematics.
The trusted solution features a triple modular redundant tmr controller. Hierarchical triplemodular redundancy htmr network for. Reliability analysis of triple modular redundancy system with. A machine with three replications of each element is termed triple modular redundant tmr. In this article we will go over the most usual options to configure a redundant architecture. Design and implementation of triple modular redundant system on linuxbased onboard computer for cubesat emir husni, angga putra, nazmi febrian sekolah teknik elektro dan informatika, institut teknologi bandung jl. Design and implementation of triple modular redundant system. Programming the micronet control system provides an iec1 environment for programming. Sep 07, 2016 350020 rack interface module operation and maintenance manual 2 1. This device accurately monitors turbine rotor speed and acceleration via active or passive mpus magnetic pickups and issues a. Reliability analysis of triple modular redundancy system with spare i khalid a. The voting solution uses advanced diagnostics to assist in results. Fault tolerance is achieved through a triple modular redundant tmr architecture within the module for each of the 40 input channels.
Verification of triple modular redundancy tmr insertion. On the optimal design of triple modular redundancy logic for srambased fpgas f. Complete stepbystep instructions are given for the entire process, explaining the use of the isolation design flow idf. Triple modular redundancy verification via heuristic. The classic nmodular redundant example is triple modular redundant. Uses the same triple modular redundant tmr architecture as proven over more than 30 years adheres to the same principals of operation as proven in more than 19,000 systems is the field proven tricon inside a compact form factor is based on the proven tricon modules. Distributed tmr dtmr or global tmr gtmr xtmr but its not this easy tmr schemes are differentiated by how the triplication is performed and where the voters are placed. Partial evaluation based triple modular redundancy for single event upset mitigation sujana kakarla abstract we present a design technique, called partial evaluation triple modular redundancy for hardening combinational circuits against single event upsets seu. The voting circuit can then only detect a mismatch and recovery relies on other methods.
For this purpose, redundancy at transistor level has been add ed. So, for example, two processors compute the same correct result and the third processor is. For the highest level of integrity and availability, the 2300t triple modular redundant system features voting with triple, dual or common io, as required. Us6240526b1 triple modular redundant computer system. But wait, recently stratus announced its perfect performance program, which guarantees 100% uptime. Synchronizing triple modular redundant designs in dynamic partial reconfiguration applications.
Verification of triple modular redundancy tmr insertion for. Synchronizing triple modular redundant designs in dynamic. The use of triplemodular redundancy to improve computer. Any number of 4channel relay modules can be placed in any of the slots to the right of the rack interface module.
Gii overspeed protection device triple modular redundant description the protechgii is an overspeed safety device designed to safely shut down steam, gas, and hydro turbines of all sizes upon sensing an overspeed or overacceleration event. Triple modular redundancy with perfect voting circuits figure 2 illustrates the triple modular redundant con. The 2300d hics is built on the same advanced technology as 2300t, for a dual redundant solution. If one redundant element fails then another element takes over for the failed element. Intel stratix 10 seu mitigation user guide archives on page 31. This document does not address the protection of inputs and outputs, the usage of onchip block memories or dedicated shiftregisters etc. Triple modular redundancy using intel advanced vector extensions technical report dmitrii kuvaiskii yoleksii oleksenko pramod bhatotia pascal felberz christof fetzery y technical university of dresden, germany z university of neuchatel, switzerland abstractinstructionlevel redundancy ilr is a well known approach to tolerate transient cpu faults. Modular redundant power supply systems using linear regulated power supplies acdc single output. Basic concepts of redundant architecture of plc plcdesign. Verification of triple modular redundancy insertion for. Download instruction sheet adobe acrobat pdf format download pdf file. Description rockwell automation publication icsttrm284oenp issue 15 5 1. Superior protection for your people, your production, and. Modular redundant systems linear regulated with power supply case sizes cm6, cm9, cm, ch11, ch16 file size 1k.