如何
在趋势日志列表中附加计算方法
您可以在趋势日志列表中附加计算方法，以处理记录值和显示结果。
Use a calculation method to process the records of the trend log before presenting them in a trend log list or a trend chart. The original records in the trend log are not affected by the calculation method. The calculation method is applied to the trend log records grouped by a specific time interval.
可使用以下计算方法：
无
最大值
最小
平均
小计
增量
区间增量
仪表消耗
并非所有计算方法都适用于 EcoStruxure Building Operation 的所有功能。
Adapt the period so it contains the required amount of records to generate a correct calculation.
If a calculation method is connected to an interval trend log with delta, make sure that the period and delta are adapted for the calculation.
趋势图和趋势日志列表中的周期时间戳
When a calculated value for a period is presented, the middle of the period is used as the timestamp.
Example:
The calculated value for the period 8:00-9:00 is stamped 8:30. If there is a value at 9:01, the next period is 9:00-10:00, which is stamped as 9:30. The full period may not have passed yet, but the value can be presented even if parts of the period are in the future.
在 WorkStation 的 系统树 窗格，选择想要附加计算方法的趋势日志列表。
在 趋势日志列表 工具栏，点击 打开趋势日志列表设置 按钮
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在趋势日志清单属性的 计算方法 框中，选择一个计算。
在 周期增量 框中，如果计算方法是带周期的增量计算，选择 是 。
在 周期 框中，选择要执行计算方法的时间跨度。
注释：If Custom is selected in the Period box, enter a custom time span for which the calculation method is to be executed in the Custom period box and the time when you want the custom period to start in the Custom period alignment boxes.
To calculate the required number of records for a trend log, multiply the number of records in one day with the number of days you want the trend log to record. For example, the interval of the trend log is set to 1 hour, then this gives 24 recorded values per day. The trend log should record at least one month of recorded values equal to 31 days. For example, the number of records = 24 x 31 = 744.
在 自定义周期 框中，输入要执行计算方法的自定义时间跨度。
在 自定义周期调整 框中，输入想要自定义周期开始的时间。
点击 确定 。
现在会在趋势日志列表中附加计算方法。
计算方法
Trend Log List Properties
Meter Trend Log Calculation Fails