The general process and PLC control system design requirements

The general steps of PLC control system design with the traditional relay - — Contactor in comparison with the design of control system, the selection of components instead of the original device, the program design instead of the original logic circuit design. ( 1) Process according to the analysis of the control requirements, define control tasks, formulate the technical requirement of control system design. Technical conditions generally in the form of design specification to determine, it is the basis of the whole design. The characteristics and requirement of technological process is the main basis of development of PLC controller control system, so must be detailed analysis and careful study, so as to define the task and scope. Such as needed to complete actions ( Moves along, action conditions, related protection and interlock, etc. ) And should have the operating mode ( Manual, automatic, continuous, single cycle, single step, etc. ) 。 ( 2) Determine the user input device ( Button, switch operation, limit switches, sensors, etc. ) , output devices ( Executive components such as relay, contactor, lights) And driven by output device control object ( Motor, solenoid valve, etc. ) Estimation of PLC I/O points; Analysis of signal relationship between objects and PLC control, signal properties, depending on the complexity of the control requirements and control accuracy estimate the user memory capacity of PLC. ( 3) Selection of PLC. PLC is the core component of control system, to ensure correct selection of PLC control system of the whole technical and economic indicators play an important role, the choice of PLC controller selection, including the selection of models, the capacity selection of I/O module, the choice of power supply module, etc. Select the PLC is based on the input and output points and forms, control mode and speed, control precision and resolution, capacity of the user program. ( 4) Distribution, definition of PLC controller I/O points, draw the I/O connection diagram. According to the selection of PLC address range given by the element ( Such as input, output, auxiliary relays, timers, counters. Data area, etc. ) , the control system using each input and output signals and internal components define special signal name and address in programming use which internal components, perform the function of what to do every frame is clear, and correct. ( 5) Design of PLC control program. Including design ladder diagram, write statement tables, draw flow chart of control system. Software control program is to control the whole system, is to ensure that the system works well, safe. The key to reliable, therefore, the design of the control program must go through repeated tests. Modify, until meet the requirements. ( 6) Control cabinet ( A) Design and field construction. At the same time of control program design, hardware can be equipped with the work, including high voltage equipment installation, control cabinet ( A) The design and production, the installation of the programmable controller, input/output connection, etc. In the design of relay control system, must be in the control circuit design is completed, to carries on the control cabinet ( A) Design and field construction. Visible, USES the PLC control system, can make the software design and hardware equipped with parallel work, shorten the project cycle. If need be, still need to design work station, electric cabinet, analog display plate and non-standard electrical components. ( 7) Commissioning, acceptance, delivery, use, and document control system of the technical documentation. Preparation of the control system of the technical documentation including specification, design specification and instruction manual, electrical diagram and schedule of electrical components, etc. The traditional electrical diagram, generally includes electrical schematic diagram, electrical layout and electric equipment installation drawing. In the PLC control system, this part of the figure can be referred to as the 'hardware'. It on the basis of the traditional electrical diagram, to increase the PLC part therefore should increase in the electrical schematic diagram of PLC I/O connection diagram. In addition, the PLC control system of electrical diagram should also include the program diagram ( Ladder diagram) Figure, you can call it 'software'. To provide customers with 'software', can facilitate users development or technology to modify the program, and is conducive to the user analysis and troubleshooting in the maintenance. The above content can be adjusted according to the specific tasks.
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