what is sequence control?

Answer 1

Here is an example.

When a rocket is launched there are a lot of things that must happen. Fuel has to be loaded into the tanks, liquid oxygen must be loaded. For this to happen, pumps must be started, valves must be opened (or shut). Pressure, temperature, and flow measurements must be monitored to make sure everything goes smoothly. Most of the valves and pumps are run remotely (not manually), so they are electric valves.

Relays are used to open and shut valves, and start or stop pumps. An electronic sequence controller controls those relays, and is set up to make sure that, for example, when a pump is started that the valves all along the way for that pipe carrying rocket fuel, are all open first, otherwise the pump would overload. When the pressure in the tank shows the tank is full, the controller shuts the pump off, otherwise the tank might burst. The valves have to be shut otherwise the fuel would leak back out of the tank. It's all part of the sequence.

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Answer 2

Sequence control is used a lot in Process plants through a distributed control system. It allows certain pieces of plant to be automatically started in the correct order depending on process requirments, rather than relying on an operator to manually start each piece of equipment that can leave room for errors.

Answer 3

As the name implies, it's controlling the 'sequence' of things that happen in a machine or other equipment. Making sure that 'A' happens before 'B' happens.

Doug

Answer 4

Sequence control
Sequence control : the control of the order of execution of the operations both primitive and user defined.

Implicit: determined by the order of the statements in the source program
or by the built-in execution model

Explicit: the programmer uses statements to change the order of execution
(e.g. uses If statement)

Levels of sequence control:

Expressions: computing expressions using precedence rules and parentheses.

Statements: sequential execution, conditional and iteration statements.

Declarative programming: an execution model that does not depend on the order
of the statements in the source program.

Subprograms: transfer control from one program to another.

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