Sequence control mechanic in main unit ( power ) and control unit ( Analaog and Digital Control )

Sequential Control System ( memory ) . In principle there are two kinds of control systems, namely sequential or logic control systems and linear or feedback control systems.

a. Feedback control

Feedback control is control with feedback, an example of feedback control is the story of a father who asked his son to rotate the antenna in order to get quality TV images. Then someone who drives a car at a certain speed, when that person steps on the gas pedal he will pay attention to the speedometer if he exceeds a certain speed limit he will slow down the vehicle, otherwise if it is too slow he will increase his speed by pressing the gas pedal deeper.
Another example of feedback control is:
- Position Control : AGV (Auto guide vehicle) uses a sensor for feedback so that its position is always on the track
- Pressure Control : for example the pressure switch will break if it exceeds a certain pressure, so the pressure will be constant within a certain pressure range
- Temperature Control for example in the control oven, the oven will continue to heat if it has not reached a certain temperature, and will turn off when the temperature has exceeded certain limits in order to maintain the temperature range, for example the feedback is from the thermocouple sensor.

b. Sequence Control

Sequence control is control that is given based on a series of processes that are running/based on a certain sequence. An example is if we ask someone to cook fried eggs, at first they will turn on the stove, when finished they will pour the oil into the pan, after it is hot enough, they will then start frying the eggs and add certain spices until they are finally cooked, then they will put them on a plate. , turn off the stove then serve it. The story above is a direct example of the sequence form. In an electrical control system, for example, we want to turn on the motor 3 seconds after the main switch has been pressed, this kind of thing is also sequence control.

sequential control is a circuit that is used both in mechanical, electrical and electronic circuit equipment as well as integrated electronic networks. A direct review of mechanical controls, namely the use of gears and control valves, while in electrical circuits, namely the use of contactors, MCBs, DC to AC relays and Timers and push buttons to be assembled in a self-holding, interlocking and prioritizing manner, finally in the electronic machine circuit, namely the use a series of transistors, ICs, microcontrollers and microprocessors as well as Internet of Things networks as remote and near remote controls. it can be said or concluded that sequential control is one of the control techniques used to regulate an operation that is interconnected, sequential and integrated with one another (in electronics it is called a memory circuit), in sequential circuits we have to make a sequential algorithm, sequential algorithm are steps that are carried out sequentially according to the order of writing. Basically, an algorithm is a process description for doing something that is arranged in a series of actions. In simple terms, the working principle of the algorithm is divided into, input (input), process, and output (output). Algorithm Basic Structure
In general, the basic structure of the algorithm consists of sequential, conditional tests or branching, and looping.

1. Sequential Algorithm
Sequential algorithms are steps that are carried out sequentially according to the order in which they are written. This structure is the most frequently used structure.

Example:
The algorithm has four action lines, namely t1, t2, t3, and t4, so all actions will be carried out sequentially from action t1 to t4.

2. Branching Algorithm (Branching)
In everyday life there are times when an activity will be carried out and not carried out depending on certain situations. Likewise with algorithms, there are times when one or several actions will be done and not done depending on certain situations.
This branching algorithm structure is used to perform one action from several given options.

3. Looping Algorithm
As with humans, algorithms also recognize repetition activities, namely doing one or several activities repeatedly. However, in contrast to humans, computers do not know the term tired or bored in doing the same activities over and over again.

There are three ways you can present an algorithm, namely narratively, flowcharts or flowcharts, and pseudocode.

1. Narrative
Narrative presentation of the algorithm is written using stories as in everyday language.

2. Flowcharts
With a flowchart, the way the algorithm is presented is made in a sequence of special symbols. The sequence of symbols is depicted according to the direction of the arrows. such as start , process , and end as well as feedback .

3. Pseudocode
These troubleshooting steps are written in a program-like or similar way. Pseudocode is not specific to one programming language so that this algorithm can be translated according to the programming language in a program.
 

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