只有通过设置在CPU配置菜单中的MEM PROTECT功能设置为ENABLE时此功能才会起作用，如果此功能设置为ENABLE并且开关拨到ON的位置，那么(1)用户RAM存储器不能改变(2)数字量点不能写入和(3)时间日期时钟不能通过手持式编程器改变(然而，时间日期时钟仍然可以通过程序软件改变).
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