1336E-B025-AN-E​N

发布时间:2017-01-10

1336E-B025-AN-EN

1336E-B025-AN-EN

1336E-B025-AN-EN

 计算机面向对象编程的优点也有重用性和易管理型,在PLC中也曾在,以Step7为例,需要讨论FC和FB的差异。观察数据类型,FB比FC只不过多一个 “STAT”类型,在使用上FB需要背景DB,FC不需要,但就这个差别导致FB拥有自己独立的数据储存空间,而FC的数据储存却必须借助公有变量(如中 间变量M或者共享DB),有这样一种准则,程序块的独立性越强,其重用性也越好,产生数据访问冲突的可能性也更少,则更易于管理。有些公司生产的PLC, 其程序语言没有类似FB 的这种特性,这时可以采用类似“FC+共享DB”的替代方案解决,但它的独立性已经大大降低。

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