SMPCONT-A3B KOKUSAI 模块

山西润盛进出口有限公司

(1)控制回路的多点I/O卡应冗余配置。

(2)重要检测点的多点I/O卡可冗余配置。3）根据需要对重要的I/O信号，可选用2重化或3重化的I/O接口单元。

(六)经济性的考虑

选择PLC时，应考虑性能价格比。考虑经济性时，应同时考虑应用的可扩展性、可操作性、投入产出比等因素，进行比较和兼顾，终选出较满意的产品。

输入输出点数对价格有直接影响。每增加一块输入输出卡件就需增加一定的费用。当点数增加到某一数值后，相应的存储器容量、机架、母板等也要相应增加，因此，点数的增加对选用、存储器容量、控制功能范围等选择都有影响。在估算和选用时应充分考虑，使整个控制系统有较合理的性能价格比。

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