求翻译：为了进一步提高PLC的可靠性，近年来对大型PLC还采用双CPU构成冗余系统，或采用三CPU的表决式系统。这样，即使某个CPU出现故障，整个系统仍能正常运行。是什么意思？

In order to further improve the reliability of PLC, in recent years, posed to large PLC also uses dual-CPU redundant systems, or use a voting system of the three CPU. Thus, even if one CPU fails, the entire system can still function properly.

In order to further improve the reliability PLC in recent years, the large PLC also use double CPU constitutes a redundant system, or a combination of 3 CPU-vote system. In this way, even if a CPU malfunction, the entire system will be able to function correctly.

In order to further improve the reliability of PLC, in recent years, posed to large PLC also uses dual-CPU redundant systems, or use a voting system of the three CPU. Thus, even if one CPU fails, the entire system can still function properly.