input ==>輸入
negated input ==>反向輸入
connector ==>連接器
negated , connector ==>反向連接器
JU FB ==> FB unconditional ==> 無條件呼叫FB
JC FB ==> FB conditional ==> 有條件呼叫FB
S/R ==> Priority setting flip-flop ==> 優先設定 正反器
R/S ==> Priority resetting flip-flop ==> 優先重設 正反器
