Plc sequence function diagram composition - Database & Sql Blog Articles

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The plc sequence control is to automatically and orderly operate the various actuators in the production process according to the order of internal state and time under the action of the respective input signals in a predetermined order in the production process.
Step

A work cycle of a system is divided into a number of sequential stages, called steps, which can be represented by programming elements.

2. Initial step

The step corresponding to the initial state of the system is referred to as the initial step, and the initial state is generally the relatively stationary state in which the system waits for the start command.

3. Activity step

When the system is in the stage of a certain step, the step is active, and the step is called "active step".

4. Action

Some commands or actions to be completed in one step are collectively referred to as actions.

5. Directed connection

The directed connection specifies the progress route and direction of the active state of the step.

6. Conversion

The conversion is indicated by a dashed line perpendicular to the directed line on the directed line, and the conversion separates the two adjacent steps.

7. Conversion conditions

The logical proposition associated with the transformation, the transformation condition can be marked with a literal language, a Boolean algebraic expression, or a graphical symbol next to the short line representing the transformation.

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