Historically, these were defined by macros which built a Program Control Table (PCT), but are nowadays defined in TRANSACTION definitions within the resource definition online (RDO) database.

在历史上，这些都是由构建程序控制表(PCT)的宏定义的，但是，如今在资源定义联机(rdo)数据库的TRANSACTION定义中进行定义。

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Packet Internet Groper a program used to test whether a particular network destination is online, by sending an Internet control message protocol echo request and waiting for a response.

包因特网查询工具用于通过发送一个Internet控制消息协议回送请求并等待应答来测试一个特定网络目的地是否联机的一种程序。

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Based on the analysis of the control process and realization process, a clear flow for the online load control by the PLC control program is illustrated.

通过对控制过程及实现过程的分析，以逻辑图的方式展示了PLC控制程序对上网负荷控制的清晰流程。

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