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Honeywell DCS Terminal Board DC-TAOX11
The Quadruple Modular Redundant (QMR) architecture is based on 2oo4D voting, dual-processor technology in each QPP. This means that it is characterized by an ultimate level of self-diagnostics and fault tolerance. The QMR architecture is realized with a redundant Controller. This redundant architecture contains two QPPs (see Figure 12), which results in quadruple redundancy. The 2oo4D voting is realized by combining 1oo2 voting of both CPUs and memory in each QPP, and 1oo2D voting between the two QPPs. Voting takes place on two levels: on a module level and between the QPPs.
When a point is modified that affects a SafeNet allocation then the peer Safety Manager Controller will also be locked temporarily to prevent database inconsistencies. This lock will remain active until Point Configurator is closed. If the peer Safety Manager Controller database can not be locked, the SafeNet allocation will not be changed.
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