This is avoided by using the ExecutedOnceReg digital point to “skip” the SLC
algorithms until all transactions have been completed once.
5-7. Backup Mode Action
11/98 5-5 U3-1050
Westinghouse Proprietary Class 2C
5-7. Backup Mode Action
As described in Section 3, the “backupmodeaction” /FILE attribute can take the
value never, mute, or read_only. This parameter tells the interface program what
to do when it is not the module in a redundant pair which is in control.
When backupmodeaction is configured never, the LC module ignores the
controlreg parameter and never goes out of control. This is for standalone LCs
which are not part of a redundant link.
When bakupmodeaction is configured mute, the LC module makes no attempt to
communicate when the Controller has disabled the card via the controlreg.
When backupmodeaction is configured read_only, the LC module continues to
read data when it is not in control. The LC does not attempt to write data to the field
devices. This is used in those few cases where the hardware allows both LCs to
communicate with the field devices at the same time. When the switchover is made
from one redundant pair to the other, the newly enabled card will already have
current data and algorithms and will not have to be skipped (as discussed in
Section 5-6).

通过使用ExecuteOnCereg数字点“跳过”SLC，可以避免这种情况
算法，直到所有事务都完成一次。
5-7. 备份模式操作
1998年11月5-5日U3-1050
西屋专有2C级
5-7. 备份模式操作
如第3节所述，“backupmodeaction”/FILE属性可以采用
从不使用值、静音或只读。这个参数告诉接口程序什么
当控制权不在冗余对中的模块时。
配置backupmodeaction时，LC模块将忽略
controlreg参数，并且从不失控。这是针对独立LCs的
不是冗余链路的一部分。
当bakupmodeaction配置为静音时，LC模块不会尝试
当控制器通过controlreg禁用卡时进行通信。
当backupmodeaction配置为只读时，LC模块将继续运行
在数据不受控制时读取数据。LC不会尝试将数据写入字段
设备。这在硬件允许两个LCs同时工作的少数情况下使用
同时与现场设备进行通信。当切换完成时
从一个冗余对到另一个冗余对，新启用的卡将已经具有
不必跳过当前数据和算法（如中所述）
第5-6节）。