It is worth pointing out that during the execution of the program,in the same cycle,the previous logical operation result affects the following contacts,that is,the executed program uses the previous latest intermediate operation result.However,within the same week,the result of the subsequent logical operation does not affect the previous logical relationship.The final state of all internal relays except the input relay in this scan cycle(whether the coil is on or not,whether the contact is on or off)will affect the on and off of each contact in the next scan cycle.
值得指出的是:在程序的执行过程中,在同一周期内,前面的逻辑运算结果影响后面的触点,即执行的程序用到前面的最新中间运算结果。但在同一周其内,后面的逻辑运算结果不影响前面的逻辑关系。该扫描周期内除输入继电器以外的所有内部继电器的最终状态(线圈导通与否、触点通断与否)将影响下一个扫描周期各触点的通与断。
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