IC694ALG220CA
IC694ALG220CA库存现货，当天发货
在石油、化工、冶金等行业的某些系统中，要求控制装置有极高的可靠性。如果控制系统发生故障，将会造成停产、原料大量浪费或设备损坏，给企业造成极大的经济损失。但是仅靠提高控制系统硬件的可靠性来满足上述要求是远远不够的，因为PLC本身可靠性的提高是有一定的限度。使用冗余系统或热备用系统就能够比较有效地解决上述问题。
1、冗余控制系统
在冗余控制系统中，整个PLC控制系统（或系统中重要的部分，如CPU模块）由两套完全相同的系统组成。两块CPU模块使用相同的用户程序并行工作，其中一块是主CPU，另一块是备用CPU；主CPU工作，而备用CPU的输出是被禁止的，当主CPU发生故障时，备用CPU自动投入运行。这一切换过程是由冗余处理单元RPU控制的，切换时间在1~3个扫描周期，I/O系统的切换也是由RPU完成的。
2、热备用系统
在热备用系统中，两台CPU用通讯接口连接在一起，均处于通电状态。当系统出现故障时，由主CPU通知备用CPU，使备用CPU投入运行。这一切换过程一般不太快，但它的结构有比冗余系统简单。
小谢：（） 传真： QQ：1924049335
* 极高的可靠性
* 极丰富的指令集
* 易于掌握
* 便捷的操作
* 丰富的内置集能
* 实时特性
* 强劲的通讯能力
* 丰富的扩展模块
是谁带来了平易近人的价格，[厦门泰尼电气]
是谁留下了财富的热线 ，[]
难道说还有比这家的供应商？[厦门泰尼电气]
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