PTCON(NTCON)触点和POSCON(NEGCON)触点的本质区别在于每个用于逻辑控制的PTCON或NTCON触点指令有自己的关联实例数据。该实例数据给出了触点最后–次执行时与触点相关的BOOL变量的状态。因为每个PTCON或NTCON指令的实例都有自己的实例数据，使得与相同BOOL变量相连的两个PTCON或NTCON指令的表现不同成为可能。
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