In the event of a fault, the "software redundancy" package initiates a switchover from the master central controller to the standby:
During switchover: no effect on process since the controller outputs remain frozen
Following switchover: continuation of process based on last data received. Data may be several cycles old, therefore only useable for slower processes.
The switchover time between failure of the master and continuation of the process on the standby controller depends on several factors:
Communication performance of the CPUs used
Communication medium for master/standby coupling, type of connection and transmission rate
Quantity of data to be transmitted
Cause of fault
Transmission rate of redundant PROFIBUS DP
Number of slaves on the redundant PROFIBUS DP
For example, the following switchover times result for a system comprising two 414-2 DP CPUs and four ET 200 stations with 4 KB data to be transmitted:
If the CPUs are coupled via PROFIBUS DP: 1.2 s.
If the CPUs are coupled via MPI: 1.5 s.
skener.ru
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Арматура DENDOR
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Датчики и измерители
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Регуляторы и регистраторы
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Пневматическое оборудование
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Краны и Клапаны
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Измерительные приборы
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Системы беспроводного управления «умный дом»
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Бесконтактные выключатели Конечные выключатели Оптические датчики Энкодеры
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SKW-FS - Установка умягчения
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SKW-FK - Установка обезжелезивания