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One scan cycle is when the PLC has checked the input status, executed the program and updated the output status.

There are two main types of inputs: data inputs from devices and machines, and data inputs that are human-facilitated. The input data from sensors and machines are sent to the PLC.
Inputs can include on/off states for things like mechanical switches, buttons, and encoders.

Butterfly valves are quick opening valves that consist of a metal circular disc or vane with its pivot axes at right angles to the direction of flow in the pipe.

During strain hardening material undergoes changes in atomic and crystalline structures, increased resistance to further deformation and stress strain diagram has positive slope.

Ability of a material to absorb energy within the elastic range is called Resilience.
Resilience is indicated by the area under the stress strain curve till the point of elastic limit.

cascade control means feed forward control

On?off control will work where the overall system has a relatively long response time, but can result in instability if the system being controlled has a rapid response time. Proportional control overcomes this by modulating the output to the controlling device, such as a control valve at a level which avoids instability, but applies correction as fast as practicable by applying the optimum quantity of proportional gain.

A solenoid valve is an electrically activated valve, typically used to control the flow or direction of air or liquid in fluid power systems.

The station B is above C and D

RL = BM ( BS- FS) = 400.00(6.655-1.45) = 405.205

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