ABB AC 900F学习笔记111：Freelance_Engineering_Process_Stations-17

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5.1.2 Redundancy toggle

冗余切换

If any of the following conditions occur at the Primary, a redundancy toggle is initiated deliberately between Primary and Secondary:

如果主（控制器）发生以下任何情况，在主（控制器）和从（控制器）之间主动发生冗余切换。

• the Prim/Sec TOGGLE switch of the controller is actuated,
• 启动控制器上的主/从开关
• the Prim/Sec button of the resource is actuated in commissioning mode,
• 调试模式下启动资源上的主/从按钮。
• the RESET switch is actuated > 5 s, resulting in a cold start of the Primary,
• 复位开关在>5秒后启动，导致主（控制器）冷启动。
• the system function “Force redundancy toggle” (PRIM_SEC) is executed.
• 执行系统功能“强制冗余切换”（PRIM_SEC)。

In typical applications, the Secondary will continue the application processing after 350 to 400 ms when a redundancy toggle is initiated deliberately. In the event of an error, the actual toggle time will generally be longer, as in addition to the time for change-over required by the controller, the error detection and the change of the connected field busses will take time.

在典型应用中，当有一启动冗余切换时，备（控制器）在350至400ms之后继续应用程序的处理。在错误发生时，实际的切换时间一般比较长，因为除了冗余切换所需时间之外，检查错误和连接现场总线变化也要消耗时间。