函数块在某个实例上被调用时，函数块逻辑在这个实例数据的实例拷贝上执行。实例数据的值从–次执行延续到下–次执行。函数块的执行不能由中断触发。使用LD或者ST创建函数块逻辑。函数块逻辑可以对其他所有PAC块进行调用(程序块,参数化块，外部块和其他函数块)。LD或ST内的程序块(程序块，参数化块，外部块和其他函数块)可以调用函数块。

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