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PLC system design and debugging of the process step-PLC, power supply - Electrical Industry by zyzy wang
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PLC system design and debugging of the process step-PLC, power supply - Electrical Industry by ZYZY WANG
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| Article Posted: 12/15/2010 |
| Article Views: 124 |
| Articles Written: 2301 - MORE ARTICLES FROM THIS AUTHOR |
| Word Count: 567 |
| Article Votes: 0 |
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PLC system design and debugging of the process step-PLC, power supply - Electrical Industry |
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Analysis of the controlled object and make control requirements
Detailed analysis of the charged object characteristics of process and work to understand the charged object machine, electricity, liquid interface between the charged object to the proposed PLC The control system requirements, determine the control program, developed the design plan.
(B) determine the input / output devices
According to the system's control requirements, identify system needs all the input devices (such as: buttons, position switches, Switch And various Sensor Etc.) and output devices (such as: contactors, solenoid valves, signal lights and Other Actuators, etc.) to determine and PLC The input / output devices, to determine the PLC's I / O points.
(C) Select PLC PLC options include models of the PLC, the capacity, I / O modules Power supply And choice, see chapter II.
(D) distribution of I / O point and peripheral hardware circuit design PLC
1. Distribution I / O points Draw PLC's I / O points and input / output device connection diagram or the corresponding relationship table, the part can also be carried out in step 2.
2. PLC peripheral hardware circuit design
Draw other parts of the system Electric Road map, including the main circuit and not into the PLC control circuit.
By the PLC's I / O connection diagram and the PLC system composed of the external electrical circuit diagram electrical schematic. End here hardware electrical lines have been identified.
(5) Programming 1. Programming Control requirements under the system, use the appropriate method to design the PLC program design. System control program to meet the requirements to the main line, one by one, or write to achieve the control procedures for each sub-task, and gradually perfect the system of designated functions. In addition, the program typically should include the following:
1) initialization procedure. After the PLC power generally to do some initialization of the operation, to start making the necessary preparations, to avoid system malfunction occurs. The main contents of initialization: some data areas, counter to clear, the required data on some of the data area to recover, for some Relay To set or reset, for some initial state to display and so on.
2) detection, fault diagnosis and display program. Relatively independent of these procedures are generally completed in the program design and add.
3) procedures for the protection and chain. Protection and linkage is an essential part of the program must be seriously considered. It can eliminate the illegal operation of the control logic caused confusion.
2. Process simulation debugging Process simulation to debug the basic idea is to facilitate the production site in the form of simulation of the actual state of operation for the program to create the necessary environmental conditions. According to generate on-site signal in different ways to debug a hardware simulation modeling and software simulation in two forms.
1) hardware simulation method is to use a hardware device (such as with another PLC or some input device, etc.) generated on-site analog signals, and these signals to hard-wired way connected to the PLC system, the input of its The timeliness. I am an expert from China Crafts Suppliers, usually analyzes all kind of industries situation, such as hardware drawer slides , machining titanium.
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