function block

基本解释

Variables that are a part of a %FUNCTION block, and they can only to be referenced within that block
FUNCTION 块中的变量，并且它们只能在该块中引用。
The receive() method blocks until a message appropriate to the function block that's passed in to it is received.
receive()方法将阻塞，直到接收到对于功能块合适的消息。
It delivers time distribution to fieldbus devices for support of Function Block scheduling and alarm time-stamping at the point of detection.
根据时间调度在设备间传输数据来支持功能块调度和报警时间戳的现在检测。

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