NI TB-2627多种分辨率的编码器
PAC系统应用程序的结构
PAC系统应用程序是程序块结构的。应用程序中包括系统内的CPU和模块所需的所有控制逻辑。
应用程序在编程软件中开发并且传输到CPU中。程序存储在CPU的稳定内存中。在CPU扫描过程中(第5章),CPU从模块读取输入数据,并且存储在输入存储器中。然后CPU使用更新了的输入数据完全执行一-次应用程序。应用程序执行后产生新的输出数据并将这些数据写入输出存储器。
应用程序执行完后,CPU将输出模块写到模块中。模块结构的程序包含一个_MAIN 块。程序从MAIN 块开始执行,包括MAIN 块在内,程序最多可以有512个块。
如何调用程序块
在程序逻辑中_ MAIN 块和其他块中调用后,程序块执行。在本例中,LD_ BLK1 - -直被调用。可以设定程序块的调用条件,在输入量%100500和输出量%Q00100为ON时,调用LD_ BLK2。 详见第八章的调用函数。
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