1746-P4 A-B 后备系统

FOXBORO FBM241C
FOXBORO FBM241C
FOXBORO FBM241C
YASKAWA CP-9200SH/CPU
AB VPL-B0631T-CJ12AA
FISHER-ROSEMOUNT KJ1501X1-BB1
FISHER-ROSEMOUNT KJ1501X1-BB1
ASCO WSNF8327B012*220VAC
A-B 1756-IF16
GE IC693CPU350
A-B 9324RLD000ENM
FOXBORO P0926AH-B
SCHNEIDER 140AC013000
SIEMENS 6AV6642-0AA11-0AX1
GE IC200GBI001
ABB RF620

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Description

余设计和降级操作是必要的。冗余设计可采用热后备或冷后备方式。热后备方式操作时,冗余的后备系统也同时运行,两者输出的结果一致时,表示系统是正常运行的;一旦结果不一致,则发出警报信号,同时,根据自诊断的结果,切换到正常的系统去。冷后备方式操作时,冷后备系统不运行,它在自诊断检测出运行系统故障后才切入后备系统。

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