a．控制单元的冗余

（1）重要的过程单元：CPU（包括存储器）及电源均应1B1冗余。

（2）在需要时也可选用PLC硬件与热备软件构成的热备冗余系统、2重化或3重化冗余容错系统等。

b． I/O接口单元的冗余

（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。

武汉路易达自动化设备有限公司
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