请看英语帮助：

RS (Reset-Set Flip Flop) is reset if the signal state is "1" at the R input, and "0" at the S input. Otherwise, if the signal state is "0" at the R input and "1" at the S input, the flip flop is set. If the RLO is "1" at both inputs, the order is of primary importance. The RS flip flop executes first the reset instruction then the set instruction at the specified <address>, so that this address remains set for the remainder of program scanning.

问题出在中文翻译上。德国大学图书馆的英语书和杂志比德语的还多，西门子的英语资料一般是可信的。怀疑帮助有问题建议看看英语帮助。