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Labview pid control block diagram9/5/2023 ![]() ![]() Refer to the Simulation - Cascade and Feedforward Surge Tank Level VI in the labview\examples\control\PID directory for an example of using the PID Setpoint Profile VI. ![]() dt out (s) returns either the value of dt (s) or the computed interval if you set dt (s) to –1. This paper describes the design and development of afeedback control system that maintains the temperature of a process at a desired set point.The system consists of a PC-based data acquisition unit that provides input and outputinterfaces between the PC and the sensor circuit and hardware. Profile complete? indicates whether the elapsed time is greater than or equal to the last defined time value in the setpoint profile.Įlapsed time (s) returns the elapsed time, in seconds, since the first call of the VI or since the reinitialization of the VI.ĭt out (s) returns the actual time interval in seconds. Setpoint returns the setpoint value output this VI calculates from the setpoint profile and from the elapsed time since the first call or reinitialization of this VI. Reinitialize? specifies whether to reinitialize the output to the setpoint profile at time t = 0. If dt (s) must be less than 1 ms, specify the value explicitly. If dt (s) is less than or equal to zero, this VI calculates the time since it was last called using an internal timer with 1 ms resolution. Setpoint specifies the setpoint values in the setpoint profile.ĭt (s) specifies the loop-cycle time, or interval in seconds, at which this VI is called. Specify the time (s) values in ascending order. Time (s) specifies the time values in the setpoint profile. Setpoint profile specifies an array of time and setpoint value pairs that define the profile of the setpoint as a function of time. ![]()
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