SDO is based on the concept of disconnected data graphs.
sdo基于断开连接的数据图的概念。
Online device disconnected with unsent data. RETRY or OK to lose data.
联机设备断开，有未发送的数据。按RETRY(重试)，或按OK丢弃数据。
The data context does not track the state of disconnected entities.
资料内容不会追踪已中断连接之实体的状态。
The data context does not track the state of disconnected entities.
资料内容不会追踪已中断连接之实体的状态。
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