A query in control system is a request for information or data from the system. It is used to retrieve information about the current state of the system, such as sensor readings, actuator positions, or control parameters.
A query is a request for information, while a command is a directive to the system to perform a specific action. Queries do not change the state of the system, whereas commands do.
There are two main types of queries in control systems: status queries and parameter queries. Status queries retrieve information about the current state of the system, while parameter queries retrieve specific values or settings.
In closed-loop control systems, queries are used to monitor the system's performance and make adjustments to maintain the desired output. The controller sends queries to the system to retrieve feedback information, which is used to calculate the appropriate control action.
Yes, queries can be used in real-time control systems. In fact, they are commonly used to continuously monitor the system's performance and make adjustments in real-time to maintain stability and performance.