%T,%S,%SA,%SB和%SC变量有转换位，但是没有覆盖位。CPU将转换位用于计数器，状态转换结点和状态转换线圈。注意:计数器使用的转换位与结点和线圈使用的转换位不同。计数器使用的转换位存储在本地变两种。变量的转换位指示了最近写入变量的值(ON,OFF)和之前写入变量的值是否相同。当两个值相同时，转换位OFF.不同时

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