因为PACSystems CPU缺省的局地址就是1。CPU在两种情况下使用缺省地址:1.如果没有配置时上电，使用缺省局地址1.2.当端口模式参数被设置为信息模式，Modbus变成停止模式下的协议，局地址默认为1,在CPU配置中给端口指定–个停止模式除外，然后改变用于停止模式局地址。

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