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A parameter is a limit: could be a speed limit on the road. A variable is something that changes in the system: could be the actual speed of a car.
A user variable is a memory which is used in specific function or functionality. A system variable is kinda of generic, accessible to all users of the system. It does not bind to specific process as such.
difference between farming system and cropping system
difference between operating system and system software?
An analog control system is one that presents data by measuring a continuous variable. This reports the data back in voltage or pressure.
Which of the following is NOT a system design parameter? Human Systems Integration (HSI), Reliability and Maintainability, Standardization, DOTMLPF Change Recommendation
a gate valve is a one way totally open or closed valve, a control valve is a variable valve.
the difference between end user system and organisational system
Difference between a human being and an elephants digestive system?
It depends on what is stating invalid parameter, the system, the operating system, etc. Far more information is needed to troubleshoot.
explain the difference between systems and sub systems
is quantity or item controlled by the decision maker.