概要
在智能向导应用中，测试信号由叠加了中高频脉冲的主要阶跃组成。一个典型的测试信号如下所示。
MV的阶跃周期由一个大的向上（向下）阶跃以及随后一个大的向下（向上）阶跃组成。
重要步骤
每一个主要阶跃（大的动作）都将保持由参数STMVDUR指定的一段时间。这意味着一个完整的阶跃周期将持续2× STMVDUR分钟。控制工程师要求的阶跃大小可以由智能向导引擎进一步限制，动作大小受所有变量最大化限制（包括：STMVMAXSTEP，ULINDM/ LLINDM，STCVMAX/ STCVMIN，STRAMPRT）。
如果上一步方向是向上（或向下），那么下一步将向下（或向上）。对于初始主要阶跃，若MV阶跃大小受到CV限制约束，阶跃方向将由所能执行的最大动作大小决定。
如果在两个方向上移动有同样的动作大小（动作大小由STMVMAXSTEP约束），那么智能向导引擎将随机选择一个方向作为初始大阶跃方向。
虽然阶跃大小由智能向导引擎计算，用户可以通过改变STSTEPFRAC（范围在0.0和1.0之间）参数执行其中部分阶跃选项。
中、高频率脉冲
在满足预先确定的等待期后，中高频率脉冲被叠加到主要阶跃中。
最终测试信号（叠加后）的大小始终在主阶跃大小内。脉冲频率具有随机成分，但可以通过设置STMVPULDUR整定。 STMVPULDUR是作为MV阶跃持续（STMVDUR）一部分的频率脉冲宽度。脉冲幅度也有一个随机部分，且通过STMVPULFR整定，其是作为主阶跃大小(STMVMAXSTEP)一部分的频率脉冲幅度。
测试信号控制的其他参数
智能向导测试应用还提供了额外的机制，以允许控制信号曲线。你可以在运行周期内限制每个方向的最大允许动作量（STMVMAXU和STMVMAXD）。
其他注意事项
•注意，可以使用TEST-NOPULSE模式的STGREQ消除整个测试组中的中高频脉冲。
测试信号配置参数
以下参数可用于定义MV阶跃信号的幅度、持续时间和形状。
也可以看看
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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
