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NI PXI-7952R随着工业技术的指数级增长
系统安全
PAC系统支持以下两种系统安全类型:
密码/授权级别
■OEM保护
密码和授权级别
密码是PAC系统CPU的一个可配置的特性。可以选择是否使用密码。在编程软件中进行密码设置。编程器在线时,密码为编程器的访问设定了级别。下线模式下, 密码失效。
缺省状态是没有密码保护。CPU的每个权力等级可以有一个密码。密码长度为1~7ASCII个字符。只能使用编程软件更改密码。
设定密码之后,通过任何通讯形式访问CPU都要正确的输入相应权力级别的密码。密码通过校验后,访问可以进行本个级别和更低级别的访问(例如,正确输入了第3级密码以后,可以访问1, 2,3级的功能)
注意:CPU的运行模式转换会覆盖密码。即使在编程器上不能进行运行/停止模式的转换,也可以通过CPU上的转换开关进行转换。
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