： 同号 ：吴工
PLC程序设计中传送和比较指令的作用
这些数据可以从输入端口上连接的外部器件获得，需要使用传送指令读取这些器件上的数据并送到内部单元；初始数据也可以用程序设置，即向内部单元传送立即数；另外，某些运算数据存储在机内的某个地方，等程序开始运行时通过初始化程序送到工作单元。
(1) 机内数据的存取管理
在数据运算过程中，机内的数据传送是*的。运算可能要涉及不同的工作单元，数据需在他们之间传送；运算可能会产生一些中间数据，这需要传送到适当的地方暂时存放；有时机内的数据需要备份保存，这要找地方把这些数据存储妥当。总之，对一个涉及数据运算的程序，数据管理是很重要的。
此外，二进制和 BCD 码的转换在数据管理中也是很重要的。
(2) 运算处理结果向输出端口传送
运算处理结果总是要通过输出实现对执行器件的控制，或者输出数据用于显示，或者作为其他设备的工作数据。对于输出口连接的离散执行器件，可成组处理后看作是整体的数据单元，按各口的目标状态送入一定的数据，可实现对这些器件的控制。
(3) 比较指令用于建立控制点
控制现场常有将某个物理量的量值或变化区间作为控制点的情况。如温度低于多少度就打开电热器，速度高于或低于一个区间就报警等。作为一个控制“阀门”，比较指令常出现在工业控制程序中
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Cutler Hammer EOP4MT07 120 VAC
Cutler Hammer HMDL3800F with MT3600T 800Amp 600 volt 65k@480v
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Eaton Cuter Hammer 150 Amp 120/240 VoltCircuit Breaker Cat:ED3150BP10
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GB-223E 175A Circuit
