B9 干扰变量视图

Disturbance Variable（干扰变量）数据在选中的控制器下的DV视图下显示和输入。
Disturbance Variable View（干扰变量视图）可在“ENG”和“OPE”两个模式下操作。以下是ENG模式的HIS窗口。

查看

Figure B2.2.6.1 Items/Parameters Under DV view ENG mode 图B2.2.6.1 ENG模式下DV的条目/参数

条目说明

需要操作员和工程师输入的各个条目/参数如下。

|条目 |描述| 操作员模式| 工程师模式|
| ------------- |:-------------:| -----:|
|Tag Name（位号名）| DV位号名。 |R| R|
|Tag Comment （位号描述）| DV描述。 |R |R|
|Measurement （测量值）| DV测量值（从DCS传输的干扰量实际PV值）。 |R |R|
|Bad Value（坏值）| TRUE表示DV测量值的质量是坏的； FALSE表示DV测量值的质量是好的。 |R| R|
|Disconnect（断开连接）| 当要禁止控制器使用该DV时，选择TRUE。MEASUREMENT（测量值）将被完全忽略。这在维护工作或特殊工艺操作条件期间是有意义的。 当要使控制器使用DV时选择FALSE。 |R/W| R/W|
|Essential for Control（必要的控制）| 当DV对控制是必须的时，选择TRUE。 当DV对控制不是必须时，选择FALSE（默认）。选择TRUE将有以下效果：如果DV不可用，则Execute Control（执行控制）将把控制器自动切至STANDBY模式。| R |R/W|
|Max Time Invalid (Sec)（最大无效时间）| SMOC可以使用无效值的最大允许时间。| - |R/W|
|Sample&Hold Signal（采样保持信号） |指示它是连续的（无扰动）还是采样保持信号（脉冲重连）。| -| R/W|
|Filter Time Constant (Sec)滤波时间常数| 在PV输出值有大变化后的时间常数滤波。| - |R/W|
|Minimum Value（最小值） |绝对的最小可接受值。| - |R/W|
|Maximum Value（最大值） |绝对的最大可接受值。| - |R/W|
|Minimum Deviation（最小偏差） |最小可接受变化值。| -| R/W|
|Maximum Deviation（最大偏差）|最大可接受变化值。| -| R/W|
|Value Accepted（接受值）| TRUE：表示新的DV测量值已被SMOC接受并使用，因为其满足PV检查条件。 FALSE：表示新的DV测量值未被接受，因为其不满足PV检查条件。 BAD-表示“尚未初始化”。| R| R|
|按钮||||
|Apply button（应用按钮） |如前所述。|||
|Undo button（撤销按钮） |在单击Apply（应用）按钮之前取消一个新输入的参数。然后该参数显示为黑色。|||
（R :只读, R/W :读,写或执行, -：未定义）

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原文：

B9. Disturbance Variable View

Disturbance Variable data are displayed and entered on the selected DV view of the selected controller.
Disturbance Variable View has two operations such as “ENG” and “OPE” mode. 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| DV Tag Name| R| R|
|Tag Comment |DV Comment |R| R|
|Measurement| Measured value of DV (This is actually a PV value from DCS for this disturbance) |R| R|
|Bad Value |TRUE indicates quality of measurement for DV is bad. FALSE- indicates quality of measurement for DV is good. |R |R|
|Disconnect| TRUE- is selected when DV 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 DV is to be enabled for use by the controller| R/W|R/W|
|Essential for Control |TRUE- is selected when DV is essential for control. FALSE -(Default) is selected when DV 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 |R/W|
|Max Time Invalid (Sec) |Maximum allowable time that invalid value can be used by SMOC. |-| R/W|
|Sample&Hold Signal |Indicates if it is a continuous (bumpless) or sample and hold signal (bump reconnection) |- |R/W|
|Filter Time Constant (Sec) |Time constant to filter PV out put value after a large change |- |R/W|
|Minimum Value|Absolute minimum acceptable value| - |R/W|
|Maximum Value| Absolute maximum acceptable value| -| R/W|
|Minimum Deviation| Minimum acceptable change in the value |- |R/W|
|Maximum Deviation| Maximum acceptable change in the value |- |R/W|
|Value Accepted| TRUE: Indicates that new DV measurement has been accepted and used by SMOC as it satisfies the PV check conditions. FALSE: Indicates that new DV measurement has not been accepted, as it does not satisfy the PV check conditions. BAD- indicates ‘Not yet initialized’.| R| R|
|Button|||
|Apply button |As Explained Earlier|||
|Undo button| Cancel a newly entered parameter before the “Apply” button is clicked. Then previous parameter is displayed in black.|||
（R : Read Only, R/W : Read, Write or Execute, -：Not displayed）

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2017.1.7