变量（有时被称为标签）是被命名的数据存储区。在工程中的所有变量都在变量浏览栏中被列出。每一个变量都会占用一个PLC的内存空间，所有的PLC系列（PACSystems™ RX7i除外）必须为每一个变量内存地址（如%R00001）。在 PACSystems™ RX7i中，你不需要对变量内存地址，系统会把它看作一个符号变量。

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