在TEST,TEST NO-PULSE或SUSPEND模式時測試應用將履行所有的操作員啟動目標變化。操作員可以修改STMVTRG的值（最多修改STMVMAXSTEP），并且動作將在下一周期得到執行。目標更改的動作計劃不會違反最小或最大移動準則（STMVMAXU，STMVMAXD，STMVMINU，STMVMIND）。沒有中高頻脈沖被疊加到目標動作計劃中。如果目標請求值比STMVMAXSTEP大，動作將被拒絕，并且將生成消息。
正在經歷目標變化的MV將顯示STEPPING狀態直到其達到控制目標，然后它會回到動作開始前的狀態。如果操作員決定移動一個當前正處于STEPPING狀態的MV，目標動作計劃將會取代測試動作計劃，但步驟持續時間計數將被單獨留下。如果該MV正在執行第一個大階躍動作，在STMVDUR結束時其依舊將計算它的第二大階躍動作。如果不期望這種行為，操作員可以關閉測試服務開關來強制測試移動到另一個MV。如果操作員在測試時域接近尾聲時使目標移動，并且引擎將花去幾個周期全面落實動作，引擎將首先完成目標動作，然后轉到下一個MV。
操作員啟動變化在執行時將不考慮動作是否會推動過程至CORRECTING模式。該功能應該被用于主動反應干擾或轉移工廠至一新工作點。這一功能不應該被用來強制工廠在限制范圍內運行，將MV保持在傳統工作點，或者其它可能限制智能向導測試應用有效性的原因。通常情況下，其他整定或設計變化就可以解決這些問題。鑒于該功能可能將過程推動到CORRECTING模式，應當謹慎使用。操作員培訓應明確界定適當時候進行目標變更。

也可以看看
智能向導應用下的CORRECTING模式
測試信號

附原文：
The tester application will honor all operator-initiated target changes when in TEST, TEST NO-PULSE, or SUSPEND modes. The operator can change the value of STMVTRG by as much as STMVMAXSTEP, and the move will be implemented at the next cycle. The move plan for the target change will not violate minimum or maximum movement criteria (STMVMAXU, STMVMAXD, STMVMINU, STMVMIND). No high or medium frequency pulses are superimposed onto a target move plan. If the target request is larger than STMVMAXSTEP, the move will be rejected, and a message will be generated.
The MV undergoing the target change will show STEPPING until it reaches its target, and then it will return to the state it had before the move was initiated. If the operator decides to move a currently stepping MV, the target move plan will replace the test move plan, but the step duration counter will be left alone. If the MV is executing its first large step move, it will still compute its second large step move at the end of STMVDUR. If this behavior is not desired, the operator may turn off the test service switch to force the tester to move to another MV. If the operator makes a target move at the very end of the test horizon, and the engine is going to take several cycles to fully implement the move, the engine will finish the target move first and then move on to the next MV.
Operator-initiated changes are implemented without regard to whether the move will push the process into CORRECTING mode. This feature should be used to react proactively to disturbances or to shift the plant to a new operating point. This feature should not be used to force the plant to run within constraints, keep MVs at traditional operating points, or for other reasons that might limit the effectiveness of the SmartStep tester application. Frequently, other tuning or design changes can address those problems. Because this feature can push the process into CORRECTING mode, it should be used sparingly. Operator training should clearly define appropriate times to make target changes.
See Also
CORRECTING mode in a SmartStep application
Test signal

2015.10.31