geic695cpe310
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厦门仲鑫达科技有限公司提供停产控制系统零件以满足您的老机组需求!无与伦比的灵活性维护工业自动化备件领域!
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不是很理解,能不能说得细一点
1:如果在ob里编写子程序段,是扫描的,但是如果您编写为fc调用,那么在fc的调用条件没有满足时,fc中的程序暂时不执行。这也是我所说节省时间的意思。
2:plc的执行步数根据程序长短会不同,扫描时间会根据执行步数的不同而不同,如果用一个mov指令完成8个数字量输出的控制,当然比用8个mov指令完成8个数字量输出的控制所需要的程序步数少。
添加一个:
避免了类型转换,方法如下:
以s7-200为例,它的内存格式与我们常用的pc机正好相反,它是高字在前,低字在后的。所以我们可以将字变量放在后两个字节,在程序初始化时将前两个字节清零(程序的其它地方不得使用这两个字节)。
如我们定义符号时将字变量定义在vw2,同时保持vw0的值为零。则程序中可以用vw2以字型访问该变量,同时也可以vd0以双字型访问,避免了类型转换。
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