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9907-1183 4–20mA传感器和PID以及比率/限制器功能
4-20mA传感器是一种电流环传感器，其输出信号为4-20mA的电流，通常用于工业控制和自动化系统中，可以检测温度、压力、流量等物理量。PID（比例-积分-微分）是一种控制算法，用于控制系统中的误差信号，通过调整比例、积分和微分三个参数，达到控制输出值的目的。比率/限制器则是一种用于限制访问者对服务的使用频率的控制机制。
在工业控制系统中，4-20mA传感器通常与PID控制器配合使用。4-20mA传感器将检测到的物理量转换为电流信号输出，PID控制器根据设定的目标值与实际值的差异，调整输入值直至输出达到设定值。通过这种方式，可以实现对温度、压力、流量等物理量的精确控制。
另外，比率/限制器也可以与PID控制器配合使用。比率/限制器可以限制每个API的调用次数和最大调用次数，从而控制对服务的使用频率。这可以帮助API提供者限制对API的访问频率，防止滥用，同时保证服务的稳定性和可用性。
总之，4-20mA传感器和PID控制器以及比率/限制器在工业控制系统中都有广泛的应用，可以实现对温度、压力、流量等物理量的精确控制，并限制对服务的访问频率，保证服务的稳定性和可用性。
9907-1183 4–20mA传感器和PID以及比率/限制器功能
The 4-20mA sensor is a current loop sensor with an output signal of 4-20mA of current, which is commonly used in industrial control and automation systems to detect physical quantities such as temperature, pressure, and flow. PID (Proportional Integral-differential) is a control algorithm used to control the error signal in the system, by adjusting the proportion, integral and differential three parameters, to achieve the purpose of controlling the output value. The ratio/limiter is a control mechanism used to limit how often visitors can use the service.
In industrial control systems, 4-20mA sensors are often used in conjunction with PID controllers. The 4-20mA sensor converts the detected physical quantity into the current signal output, and the PID controller adjusts the input value until the output reaches the set value according to the difference between the set target value and the actual value. In this way, precise control of physical quantities such as temperature, pressure and flow rate can be achieved.
Alternatively, the ratio/limiter can be used in conjunction with the PID controller. The ratio/limiter can limit the number and maximum number of calls per API, thereby controlling how often the service is used. This can help API providers limit the frequency of API access and prevent abuse, while ensuring the stability and availability of the service.
In short, 4-20mA sensors and PID controllers and ratio/limiter have a wide range of applications in industrial control systems, which can achieve accurate control of physical quantities such as temperature, pressure, flow, and limit the frequency of access to services to ensure the stability and availability of services.
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