_IN_OUT - 基本功能块类型的变量到派生 FB [...] _VAR IF b THEN inst [...] Output_2 : STRING; ENDVAR 称呼 fb

_TYPE FUNCTION_BLOCK FB [...] _PRG VAR fbSetA : FB [...] _VAR fbSetA(a

OldValue = 0 THEN // 0 means [...] you can write

Mutex THEN // bMutex is [...] you can write

) THEN // inputData is [...] 是对于 Profinet、EtherCAT 或 CAN [...] 使用特别实时关键的现场总线（EtherCAT、Profinet、CAN