B8. Manipulated Variable View-3

| | | | |
| ------------- |:-------------:| -----:|
| MV Status（MV状态） | 指示了MV状态。 ACTIVE-表示由控制器操作； INACTIVE- 表示控制器无操作； BAD- 表示尚未初始化。| R | R|
| MV Constraint（MV约束）| HILIMITED- MV被约束在SP High。 LOLIMITED- MV被约束在SP LOW。 | R| R|
| Prediction at Steady State（稳态预测）| Exasmoc MV在稳态下的预测值。| R | R|
|Constraint at Steady State（稳态约束）| HILIMITED- MV在稳态时被约束在Set Point High。 LOLIMITED-MV在稳态时被约束在Set Point LOW。 |R| R|
|Feed Forward（前馈） |断开连接时，若Exasmoc MV不需要用于Exasmoc控制器预测前馈时，选择FALSE（缺省）。 断开连接时，若Exasmoc MV需要用于Exasmoc控制器预测前馈时，选择TRUE。 通常操作员将其设置为“TRUE”或“FALSE”。| R R/W|
|*** Online Tuning Weight（在线整定权重） |由离线SMOC PC定义的控制准则权重因子。 |— |R/W|
|Apply button（应用按钮）| 输入上述条目的参数后，新输入的数据将以蓝色显示。 单击Apply按钮。新输入的参数被保存并发给控制器执行。颜色变为黑色。| R/W| R/W|
|Undo button（撤销按钮） |在单击Apply按钮之前取消新输入的参数。然后上一个参数显示为黑色。| R/W |R/W|
（R :只读, R/W : 读，写或执行, -：未定义）

提示

* High Limit（高限）应该> = Low Limit（低限）；

**当子控制器的执行周期为主控制器的倍数时，maximum move size（最大步幅）也为每个执行周期的MAXIMUM MOVE SIZE（最大步幅）的倍数。

** MV输出将被限制在Set Point High Limit（设定点高限）和Set Point Low Limit（设定点低限），但根据在控制器定义阶段被分配的控制优先级，可能会发生超出限制。

** Set Point High/Low Entry Limits（设定点输入高/低限）是供工程师使用的，是操作员输入的Set Point High/low/Limits（设定点高/低限）的输入限制。

Fig. 8.1 SP High/Low Entry Limit and Set Point High/Low Limit 图8.1 SP输入高/低限和设置点高/低限

检查这四个限制的关系，并显示错误代码（如果有）。

|输入检查|
| ------------- |:-------------:| -----:|
|SP High Entry Limit >= SP Low Entry Limit|
|SP High Entry Limit >= Set Point High Limit|
|SP Low Entry Limit <= Set Point Low Limit|

**即使为每个限制分配了位号名称，也会执行上述错误检查。 检测到错误时，数据变为Bad。 （R4.02）

*** MV输出值显示为“****”，直到在控制或优化模式下计算出第一个输出。

**** SPRB Precise Tolerance（SPRB精度公差） / Error Tolerance（误差公差）：

SPRB Error Tolerance >= SPRB Precise Tolerance >=0.

在控制器启动状态下，DEF文件初始加载后或两个公差都为0时，默认值被设定。

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原文：

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| ------------- |:-------------:| -----:|
|MV Status |MV status is indicated. ACTIVE- Indicates Manipulation by the controller. INACTIVE- indicates No manipulation by the controller. BAD- indicates ˉNot yet initializedˇ. |R |R|
|MV Constraint| HILIMITED- MV is limited at SP High LOLIMITED- MV is limited at SP LOW |R| R|
|Prediction at Steady State| Predicted value of Exasmoc MV at Steady State |R |R|
|Constraint at Steady State |HILIMITED- MV is limited at Set Point High at Steady state. LOLIMITED- MV is limited at Set Point LOW at Steady state. |R |R|
|Feed Forward |FALSE (Default) is selected when Exasmoc MV not required to be used for feed forward in to Exasmoc controller prediction when disconnected. TRUE is selected when Exasmoc MV required to be used for feed forward in to Exasmoc controller prediction when disconnected. Normally the operator will set it to ¨TRUE〃 or ¨FALSE〃| R |R/W|
|*** Online Tuning Weight| Control Criterion weighting factors as defined by OFF line SMOC PC. |— |R/W|
|Apply button| After entering parameters of items described above, the newly entered data are displayed in Blue. Click Apply button. The newly entered parameters are saved and be send to Controller for execution. The color then changes Black.| R/W |R/W|
|Undo button |Cancel a newly entered parameter before the “Apply” button is clicked. Then previous parameter is displayed in black. |R/W| R/W|
（R : Read Only, R/W : Read, Write or Execute, -：Not displayed）

TIPS

* High Limit should be >= Low Limit

** When the execution period of sub-controller is multiple of main controller, the maximum move size also becomes multiple of “MAXIMUM MOVE SIZE” per each execution period.

** MV output is limited between Set Point High Limit and Set Point Low Limit, though the limit violation will be occur according to the control priority assigned on the controller definition phase.

** Set Point High/Low Entry Limits for engineer use, is the entry limit for Set Point High/low/Limits for Operator.

The relationship of these four limits is checked and the error code is displayed if any.

|Entry check|
| ------------- |:-------------:| -----:|
|SP High Entry Limit >= SP Low Entry Limit|
|SP High Entry Limit >= Set Point High Limit|
|SP Low Entry Limit <= Set Point Low Limit|

** The above error check is also done even when the tag name is assigned to each limit. The data becomes Bad when the error is detected. (R4.02)

*** MV output value is shown as ‘****’, until the first output is calculated in the Control or Optimise mode.

**** SPRB Precise Tolerance / Error Tolerance:

SPRB Error Tolerance >= SPRB Precise Tolerance >=0.
The default vales are set when the controller starts after DEF file is initially loaded or both tolerance values are zero.

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2017.1.7