高分求助!有高手帮我翻译一下这个句子好吗，关于PLC（可编程控制器）的,

(3)Sequence,Timing,and Relationships 顺序、定时和相互关系 Next,determine the sequence in which control operations are to occur and the relative timing of the operations. 接着，确定待发生控制事件的顺序及操作的相对时序。 Identify the physical relationships between the I/O devic