概要
在智能向?qū)?yīng)用中，測(cè)試信號(hào)由疊加了中高頻脈沖的主要階躍組成。一個(gè)典型的測(cè)試信號(hào)如下所示。
MV的階躍周期由一個(gè)大的向上（向下）階躍以及隨后一個(gè)大的向下（向上）階躍組成。
重要步驟
每一個(gè)主要階躍（大的動(dòng)作）都將保持由參數(shù)STMVDUR指定的一段時(shí)間。這意味著一個(gè)完整的階躍周期將持續(xù)2× STMVDUR分鐘?？刂乒こ處熞蟮碾A躍大小可以由智能向?qū)б孢M(jìn)一步限制，動(dòng)作大小受所有變量最大化限制（包括：STMVMAXSTEP，ULINDM/ LLINDM，STCVMAX/ STCVMIN，STRAMPRT）。
如果上一步方向是向上（或向下），那么下一步將向下（或向上）。對(duì)于初始主要階躍，若MV階躍大小受到CV限制約束，階躍方向?qū)⒂伤軋?zhí)行的最大動(dòng)作大小決定。
如果在兩個(gè)方向上移動(dòng)有同樣的動(dòng)作大?。▌?dòng)作大小由STMVMAXSTEP約束），那么智能向?qū)б鎸㈦S機(jī)選擇一個(gè)方向作為初始大階躍方向。
雖然階躍大小由智能向?qū)б嬗?jì)算，用戶可以通過改變STSTEPFRAC（范圍在0.0和1.0之間）參數(shù)執(zhí)行其中部分階躍選項(xiàng)。
中、高頻率脈沖
在滿足預(yù)先確定的等待期后，中高頻率脈沖被疊加到主要階躍中。
最終測(cè)試信號(hào)（疊加后）的大小始終在主階躍大小內(nèi)。脈沖頻率具有隨機(jī)成分，但可以通過設(shè)置STMVPULDUR整定。 STMVPULDUR是作為MV階躍持續(xù)（STMVDUR）一部分的頻率脈沖寬度。脈沖幅度也有一個(gè)隨機(jī)部分，且通過STMVPULFR整定，其是作為主階躍大小(STMVMAXSTEP)一部分的頻率脈沖幅度。
測(cè)試信號(hào)控制的其他參數(shù)
智能向?qū)y(cè)試應(yīng)用還提供了額外的機(jī)制，以允許控制信號(hào)曲線。你可以在運(yùn)行周期內(nèi)限制每個(gè)方向的最大允許動(dòng)作量（STMVMAXU和STMVMAXD）。
其他注意事項(xiàng)
?注意，可以使用TEST-NOPULSE模式的STGREQ消除整個(gè)測(cè)試組中的中高頻脈沖。
測(cè)試信號(hào)配置參數(shù)
以下參數(shù)可用于定義MV階躍信號(hào)的幅度、持續(xù)時(shí)間和形狀。
也可以看看
智能向?qū)?yīng)用中操作員啟動(dòng)目標(biāo)改變
智能向?qū)?yīng)用的重新定位模式
附原文：
Overview
In a SmartStep application, a test signal consists of a major step superimposed with medium and high frequency pulses. A typical test signal is shown below.
A step cycle for a manipulated variable consists of one large move up (or down) followed by another large move down (or up).
Major step
Each major step (large move) will be held for a period of time as specified by parameter STMVDUR. This means a full step cycle will last 2×STMVDUR minutes. The step size requested by the control engineer may be further limited by the SmartStep engine, such that the move size is maximized subject to all variable constraints (including: STMVMAXSTEP, ULINDM / LLINDM, STCVMAX / STCVMIN, STRAMPRT).
If the previous step direction is up (or down), then the next step will be down (or up). For the initial major step, when the MV step size is constrained by a CV limit, the step direction will be determined by the enforcing the maximum move size.
If a move in either direction will have the same move size (move size constrained by STMVMAXSTEP), then the SmartStep engine will randomly choose the direction for the initial major step.
Although the step size is calculated by the SmartStep engine, the user has the option to implement only a fraction of the step by changing the parameter STSTEPFRAC (range between 0.0 and 1.0).
Medium and high frequency pulse
The medium and high frequency pulses are superimposed onto the major step after satisfying a pre-determined waiting period.
The magnitude of the final test signal (after superimposition) is always within the step size. The frequency of the pulses has a random component, but is tuned by setting STMVPULDUR. STMVPULDUR is the frequency pulse duration as a fraction of the MV step duration (STMVDUR). The magnitude of the pulses also has a random component and is tuned by setting STMVPULFR, which is the frequency pulse amplitude as a fraction of the major step size (STMVMAXSTEP).
Additional parameters for test signal control
A SmartStep tester application also provides additional mechanisms to allow control of the signal profile. You can limit a maximum allowed move size in each direction in a running cycle (STMVMAXU and STMVMAXD).
Additional notes
?Note that high and medium frequency pulsing can be eliminated for the entire test group by using the TEST-NOPULSE mode for STGREQ.
Test signal configuration parameters
The following parameters can be used to define the magnitude, duration and shape the MV step signal.
2015.10.14
