西门子PLC被锁了怎么解密

问题1：什么是西门子PLC的锁？我怎样才能知道我的PLC被锁了？<brstyle="box-sizing:border-box;color:#647f9b;font-family:"LantingheiSC","OpenSans",Arial,"HiraginoSansGB","MicrosoftYaHei",STHeiti,"WenQuanYiMi...