**POV細(xì)節(jié) **
| 名稱 | 默認(rèn)值 | 描述 |
|---|---|---|
| Alias（別名） | 工作區(qū)中POV變量的名稱。 | |
| Description（描述） | POV變量描述（與GMB中的POV描述相聯(lián)系）。 | |
| Measurement Tag [t]（測(cè)量位號(hào)） | POV測(cè)量位號(hào)名。 | |
| Disconnect Flag [t/v]（斷開標(biāo)簽） | False | 此標(biāo)簽(True/False)用于指示控制器是否使用此POV的測(cè)量值（如果斷開，SMOCPro將使用此POV的內(nèi)部預(yù)測(cè)）。 |
| Essential For Control [t/v]（必不可少的控制） | False | 此標(biāo)簽(True/False)用于指示該P(yáng)OV對(duì)與其相關(guān)的子控制器的持續(xù)（ACTIVE）運(yùn)行是否是必不可少的（也可見Max Time In Prediction）。 |
| Max Time In Prediction [t/v]（最大預(yù)測(cè)時(shí)間） | 0 | 當(dāng)POV測(cè)量值處于INACTIVE時(shí)計(jì)時(shí)器將啟動(dòng)。如果計(jì)時(shí)器超過此指定值（s）且POV是必不可少的控制，則POV的子控制器將設(shè)定為INACTIVE。 |
| Sample and Hold [v]（采樣保持） | False | 此標(biāo)簽(True/False)用于指示該P(yáng)OV是否經(jīng)常采樣（即，它是一個(gè)采樣保持裝置，如氣象色譜儀）。 |
| Impulse Factor [t/v]（脈沖因子） | 0.0 | 此值表征了該P(yáng)OV的不可測(cè)擾動(dòng)模型。該值是應(yīng)用在變量預(yù)測(cè)誤差離散濾波器的時(shí)間常數(shù)。輸入一個(gè)介于0.0（偏差更新）和1.0（設(shè)定所有測(cè)量噪聲）的值。 |
| Minimum Value [v] （最小值） | -10000.0 | 這是POV測(cè)量所允許的最小值，否則測(cè)量值將被申明為無效（內(nèi)部POV將被斷開，且SMOCPro將使用內(nèi)部預(yù)測(cè)）。 |
| Maximum Value [v]（最大值） | 10000.0 | 這是POV測(cè)量所允許的最大值，否則測(cè)量值將被申明為無效（內(nèi)部POV將被斷開，且SMOCPro將使用內(nèi)部預(yù)測(cè)）。 |
| Minimum Deviation [v] （最小偏差） | 0.0 | 這是控制器執(zhí)行時(shí)工程單位上POV測(cè)量值最小必須改變量，否則測(cè)量值將被申明為無效（內(nèi)部POV將斷開且SMOCPro將使用內(nèi)部預(yù)測(cè)）。 |
| Maximum Deviation [v] （最大偏差） | 10000.0 | 這是控制器執(zhí)行時(shí)工程單位上POV測(cè)量值最大允許改變量，否則測(cè)量值將被申明為無效（內(nèi)部POV將斷開且SMOCPro將使用內(nèi)部預(yù)測(cè)）。 |
| Estimated Value [t/v] （估值） | 0.0 | Estimated POV估計(jì)值（內(nèi)核輸出參數(shù)）。只有選中Advanced時(shí)才可見。 |
| Innovation Value [t/v] （新值） | 0.0 | 其與POV的測(cè)量值或估計(jì)值不同（內(nèi)核輸出參數(shù)）。只有選中Advanced時(shí)才可見。 |
| Actual POV Status [t/v] （POV實(shí)際狀態(tài)） | INACTIVE | POV的實(shí)際狀態(tài)（BAD/ACTIVE/INACTIVE) (內(nèi)核輸出參數(shù))。只有選中Advanced時(shí)才可見。 |
| Max Time for Rejected Value [t/v] (拒絕值的最大時(shí)間) | 0.0 | 從值被PV Check（數(shù)據(jù)直接到內(nèi)核）所拒絕開始至POV實(shí)際狀態(tài)變?yōu)镮NACTIVE的最大時(shí)間（s）。只有選中Advanced該值才可見。當(dāng)QMI測(cè)量值的采樣周期比控制器執(zhí)行周期更長時(shí)，如果最小值非零則在樣本之間POV狀態(tài)將變?yōu)镮NACTIVE。這會(huì)導(dǎo)致在每個(gè)采樣后產(chǎn)生“Invalid PV Measurement（無效PV測(cè)量量）”的錯(cuò)誤信息。若要取消錯(cuò)誤信息，則Max Time for Rejected Value設(shè)定值必須大于QMI采樣時(shí)間值。Max Time Invalid（最大無效時(shí)間）設(shè)定值必須大于Max Time for Rejected Value（拒絕值最大時(shí)間）,否則錯(cuò)誤信息將不能正確抑制。如果PV Check拒絕了輸入的測(cè)量值，不管Max Time for Rejected Value的值是多少，其都將不會(huì)更新內(nèi)部預(yù)測(cè)。 |
原文：
**POV Details **
| Name | Default Value | Description |
|---|---|---|
| Alias | Name of the POV variable in the workspace. | |
| Description | POV Variable description (linked to the POV description in GMB). | |
| Measurement Tag [t] | Tagname for the POV measurement. | |
| Disconnect Flag [t/v] | False | Flag (True/False) to indicate if the controller should use the measurement of this POV (SMOCPro will use internal prediction for the POV if it is Disconnected). |
| Essential For Control [t/v] | False | Flag (True/False) to indicate if this POV is essential for the continued (ACTIVE) operation of its associated Sub-Controller (see also Max Time In Prediction). |
| Max Time In Prediction [t/v] | 0 | If the POV measurement is INACTIVE a timer will start. If the timer exceeds this specified value (seconds) and the POV is Essential for Control, then the POVs Sub-Controller will be set INACTIVE. |
| Sample and Hold [v] | False | Flag (True/False) to indicate if this POV is sampled infrequently (that is, it is a sample-and-hold device such as e.g. a Gas Chromatograph) |
| Impulse Factor [t/v] | 0.0 | This value characterizes the unmeasured disturbance model for this POV. This value is the “Time” constant of the discrete filter applied on the prediction error of the variable. Enter a value between 0.0 (bias update) and 1.0 (all measurement noise setting). |
| Minimum Value [v] | -10000.0 | This is the minimum value allowed for the POV measurement, otherwise the measurement is declared to be Invalid (internally the POV will be disconnected and SMOCPro will use internal prediction). |
| Maximum Value [v] | 10000.0 | This is the maximum value allowed for the POV measurement, otherwise the measurement is declared to be Invalid (internally the POV will be disconnected and SMOCPro will use internal prediction). |
| Minimum Deviation [v] | 0.0 | This is the minimum amount in engineering units that the POV measurement must change per execution of the controller, otherwise the measurement is declared to be Invalid (internally the POV will be disconnected and SMOCPro will use internal prediction). |
| Maximum Deviation [v] | 10000.0 | This is the maximum amount in engineering units that the POV measurement is allowed to change per execution of the controller, otherwise the measurement is declared to be Invalid (internally the POV will be disconnected and SMOCPro will use internal prediction). |
| Estimated Value [t/v] | 0.0 | Estimated POV value (Kernel output parameter). Visible only when Advanced option is selected. |
| Innovation Value [t/v] | 0.0 | The difference between the POV measurements and their Estimations. (Kernel output parameter). Visible only when Advanced option is selected. |
| Actual POV Status [t/v] | INACTIVE | The actual status (BAD/ACTIVE/INACTIVE) of POV (Kernel output parameter). Visible only when Advanced option is selected. |
| Max Time for Rejected Value [t/v] | 0.0 | Maximum time in seconds before the POV’s actual status becomes INACTIVE when the value is rejected by PV Check (Data to Kernel directly). This quantity is visible only when the Advanced option is selected.When the QMI measurement has a longer sample time than the controller execution period, POV status will be INACTIVE between samples if Minimum Value is non-zero. This causes the following error message "Invalid PV Measurement" to be generated after every sample. To suppress the error message, Max Time for Rejected Value should be set to a value slightly greater than the QMI sample time. Max Time Invalid must be set to a value greater than Max Time for Rejected Value, otherwise the error message will not be suppressed properly. If PV Check rejects the incoming Measurement, it will not be used to update the internal prediction regardless of the value for Max Time for Rejected Value. |
2016.6.29
