6SL3352-6TH28-5AA3

6SL3352-6TH28-5AA3

6SL3352-6TH28-5AA3

转换条件标注在转换符号近旁，转换条件可以用 3 种方式表示。

（1）文字语句：b、c 触点中任何一个闭合，触点 a 同时闭合。

（2）布尔表达式：a(b+c)。（3）图形符号：

所谓转换条件是指与该转换相关的逻辑变量，可以是真(1)，也可以是假(0)。如果逻辑变量为真，转换条件为“l”，转换条件满足；如果逻辑变量为假，转换条件为“0”，转换条件不满足。只有当某使能步转换条件满足时，转换才

选择序列的开始称为 分支，转换符号只能标在水平线之下，每个分支上具有一个或一个以上的转换条件，且具有优先级。

选择序列的结束称为 合并，几个选择序列合并到一个公共序列时，转换符号只能标在水平线之上。

并行序列用双水平线表示，转换符号在双水平线之上，为公共转换条件。

并行序列的结束称为合并。转换符号在水平线以下，当双水平线之上的所有前级都处于活动状态时，且转换条件成立，则下一步被激活。同时所有前级步都变为不活动步。

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