PLC is a programmable controller and its application in industry is very important. This programming method of the programmable controller is very important for the user. Today, Xiaobian will introduce you to the programming method of the PLC program.
(1) Ladder diagram method: The ladder diagram method is to program a PLC program using a ladder diagram language. This is a programming method that mimics the relay control system. Its graphics and even component names are very similar to the relay control circuit. This method makes it easy to transplant the original relay control circuit into the ladder language of the PLC. This is the most convenient programming method for those familiar with relay control.
(2) Logic flow chart method: The logic flow chart method uses a logic block diagram to represent the execution process of the PLC program and reflects the relationship between input and output. The logic flow chart method is to use the logic flow diagram of the system to form the logic flow chart of the system. The PLC control program prepared by this method has clear logic, clear causal relationship between input and output, and clear interlocking conditions. The logic flow chart makes the entire program clear, makes it easy to analyze the control program, makes it easy to find fault points, and facilitates debugging and maintenance procedures. Sometimes for a complex program, directly using the statement table and programming with ladder diagrams may find it difficult to start, you can first draw a logic flow chart, and then use the statement table and ladder diagram to compile the PLC application for each part of the logic flow chart.
(3) Timing flow chart method: The time series flow chart method first draws the timing chart of the control system (that is, the control timing chart to which control should be performed at a certain time), and then draws the corresponding control task according to the timing relationship. Block diagram, finally write the block diagram as a PLC program. The time series flow chart method is well suited to the programming method of a time-based control system.
(4) Step-by-step control method: The step-by-step control method is to design a complicated control program with the cooperation of sequence instructions. Generally, a more complicated program can be divided into several blocks with relatively simple functions, and one block can be regarded as a step in the whole control process. From a holistic perspective, the control process of a complex system consists of several steps. The tasks controlled by the system can actually be considered to control the individual steps at different times or in different processes. To this end, many PLC manufacturers have added step-by-step instructions to their own PLCs. After drawing the flow chart of each step, the control program can be conveniently written using the step sequence command.
What is the preparation method of the PLC program has been introduced, and now everyone has already understood the PLC control program. When programming the PLC control program in the future, you can refer to the above method for preparation.
(1) Ladder diagram method: The ladder diagram method is to program a PLC program using a ladder diagram language. This is a programming method that mimics the relay control system. Its graphics and even component names are very similar to the relay control circuit. This method makes it easy to transplant the original relay control circuit into the ladder language of the PLC. This is the most convenient programming method for those familiar with relay control.
(2) Logic flow chart method: The logic flow chart method uses a logic block diagram to represent the execution process of the PLC program and reflects the relationship between input and output. The logic flow chart method is to use the logic flow diagram of the system to form the logic flow chart of the system. The PLC control program prepared by this method has clear logic, clear causal relationship between input and output, and clear interlocking conditions. The logic flow chart makes the entire program clear, makes it easy to analyze the control program, makes it easy to find fault points, and facilitates debugging and maintenance procedures. Sometimes for a complex program, directly using the statement table and programming with ladder diagrams may find it difficult to start, you can first draw a logic flow chart, and then use the statement table and ladder diagram to compile the PLC application for each part of the logic flow chart.
(3) Timing flow chart method: The time series flow chart method first draws the timing chart of the control system (that is, the control timing chart to which control should be performed at a certain time), and then draws the corresponding control task according to the timing relationship. Block diagram, finally write the block diagram as a PLC program. The time series flow chart method is well suited to the programming method of a time-based control system.
(4) Step-by-step control method: The step-by-step control method is to design a complicated control program with the cooperation of sequence instructions. Generally, a more complicated program can be divided into several blocks with relatively simple functions, and one block can be regarded as a step in the whole control process. From a holistic perspective, the control process of a complex system consists of several steps. The tasks controlled by the system can actually be considered to control the individual steps at different times or in different processes. To this end, many PLC manufacturers have added step-by-step instructions to their own PLCs. After drawing the flow chart of each step, the control program can be conveniently written using the step sequence command.
What is the preparation method of the PLC program has been introduced, and now everyone has already understood the PLC control program. When programming the PLC control program in the future, you can refer to the above method for preparation.
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