B10過程輸出變量視圖
Process Output Variable（過程輸出變量）數據在選中的控制器下的POV視圖下顯示和輸入。
Process Output Variable（過程輸出變量）視圖可在“ENG”和“OPE”兩個模式下操作。
以下是ENG模式的HIS窗口。
查看
條目說明
需要由操作員和工程師輸入的各個條目/參數如下所示。
| 條目| 描述| 操作員模式| 工程師模式|
| ------------- |:-------------:| -----:|
| Tag Name（位號名） | POV位號名。 | R| R|
| Tag Comment （位號描述）| POV的描述。| R | R|
| Measurement （測量值） | POV的測量值（該POV是從DCS讀取的實際PV值）。| R | R|
| Bad Value（壞值） | TRUE表示該POV測量值的質量是壞的； FALSE表示該POV測量值的質量是好的。 | R| R|
| Disconnect（斷開連接）| 當要將POV禁用，不讓控制器使用時，選擇TRUE。MEASUREMENT（測量值）將被完全忽略。 這在維護工作或特殊工藝操作條件時是有意義的。 當控制器要使用POV時，選擇FALSE。 | R/W| R/W|
| Essential for Control（必要控制） | 當POV對于控制是必需時，選擇TRUE。當POV對于控制不是必需時，選擇FALSE （默認）。選擇“TRUE”將有以下效果。 如果POV不可用時，則Execute Control（執行控制）將自動使控制器進入STANDBY（掛起）模式。| -| R/W|
| Maximum Time in Prediction（預測最大時間） | 當控制器在斷開或不可用（例如，BAD值）POV的情況下執行延長的時間段。控制器將在內部繼續預測POV值，但因為沒有來自過程的反饋，該預測不可避免地會偏離實際過程值。為此，已經為每個必要的POV添加了檢查，該檢查僅允許該POV在設置為MAX TIME IN PREDICTION（最大預測時間）的有限周期內保持斷開或不可用，之后控制器將被強制為STANDBY（掛起）。 對于非必需的POV，不執行該檢查。這可以確保具有長時間測量問題的POV可以永久斷開，直到問題解決。| -| R/W|
| Sample&Hold Signal（采樣保持信號）| 指示它是連續（無擾動）還是采樣和保持信號（脈沖重連）。| - | R/W|
| Impulse Factor (脈沖因子) | 用于過濾不可測量干擾的脈沖因子。| - | R/W|
原文：
B10. Process Output Variable View
Process Output Variable data are displayed and entered on the selected POV view of the selected controller.
Process Output Variable view has two operations modes such as “ENG” and “OPE”.
Following are the HIS windows for the ENG modes.
View
Description of items
Various items/parameters need to be entered by operator and engineers are described below.
| Item | Description | Operator mode| Engineer mode|
| ------------- |:-------------:| -----:|
| Tag Name | POV Tag Name | R| R|
| Tag Comment | POV’s Comment| R | R|
| Measurement | Measured value of POV (This is actually a PV value from DCS for this POV)| R| R|
| Bad Value| TRUE indicates quality of measurement for POV is bad. FALSE- indicates quality of measurement for POV is good. | R | R|
| Disconnect | TRUE- is selected when POV is to be disabled for use by the Controller. The MEASUREMENT will be totally ignored. This is of interest during maintenance work or special process operating conditions. FALSE- is selected when POV is to be enabled for use by the controller| R/W | R/W|
| Essential for Control| TRUE- is selected when POV is essential for control. FALSE -(Default) is selected when POV is not essential for control. Selection of “TRUE” provides following effect. If in case DV is not available then “Execute Control” routine will automatically put the controller into STANDBY mode.| -| R/W|
| Maximum Time in Prediction | It is not desirable for the controller to execute for a prolonged period with a disconnected or unavailable (e.g. BAD VALUE) POV. The controller will continue to predict the POV value internally, but without feedback from the process, this prediction inevitably wander away from the actual process value. For that reason, a check has been added for each essential POV which will allow only that POV to remain disconnected or unavailable for a finite period set as “MAX TIME IN PREDICTION” in minuets, after which the controller will be forced to “STANDBY” For a non-essential POV, this check is not carried out. This ensures that POV’s with long-term measurement problems can be permanently disconnected until problem is fixed.| -| R/W|
| Sample&Hold Signal| Indicates if it is a continuous (bumpless) or sample and hold signal (bump reconnection) | - | R/W|
| Impulse Factor | Impulse factor to filter unmeasured disturbances. | - | R/W|
2017.1.8
