Check our new membership plans and prices! The first step in developing a control program is the definition of the control task.
Development of an algorithm
The control task specifies what needs to be done and is defined by those who are involved in the operation of the machine or process. The second step in control program development is to determine a control strategy, the sequence of processing steps that must occur within a program to produce the desired output control.
This is also known as the development of an algorithm. A set of guidelines should be followed during program organization and implementation in order to develop an organized system.
Approach guidelines apply to two major types of projects: new applications and modernizations of existing equipment. Flow charting can be used to plan a program after a written description has been developed.
A flowchart is a pictorial representation of the process that records, analyzes, and communicates information, as well as defines the sequence of the process.
PLC Program Examples
Logic gates or contact symbology are used to implement the logic sequences in a control program. Certain parts of the system should be left hardwired for safety reasons. To program the PLC, the devices must be programmed in the same logic sequence as they are in the hardwired circuit see Figure 3. Therefore, the stop push button will be programmed as an examine-ON instruction a normally open PLC contact in series with the start push button, which is also programmed as an examine-ON instruction.
If the start push button is pressed, output will turn ON , sealing the start push button and turning the motor ON through the starter.
If the stop push button is pressed, the motor will turn OFF. Note that the stop push button is wired as normally closed to the input module.
PLC Program Examples
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PLC Programming Examples
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Industrial Automation. Basic steps in PLC programming for beginners. Development of an algorithm The first step in developing a control program is the definition of the control task.
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