系列90-30/20/Micro PLC中所设计的安全旨在防止对PLC内容的越权改变。PLC中有四级安全级。第1级为常有效,只提供读取PLC数据能力;不允许修改应用程序。其它三种安全级均由口令保护其存取安全级。每一个较高特权级允许作比较低级有更大的改变能力。存贮在所授特权中的特权级是当前级加上所有较低级的特权综合。
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