也可以使用托管在Azure之外的外部定时器，但是这会导致可靠性的问题。
External timers hosted outside Azure could be used, but this leads to reliability issues.
以工程实例为基础，对使用外部定时器时给P LC系统带来的时间竞争问题进行分析，并提出解决措施。
Based on instances, the paper analyses the time conflict of PLC system caused by exterior timer, and provides the solution to the problem.
只在使用非静态的服务绑定时使用这两个lob；可选伙伴链接，代表到外部服务的连接。
Both LOBs are used only if a non-static binding of services is used; optional Partner links, which represent connections to external services.
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