Design of programmable control system when the fault prevention

In modern industrial production, the use of the programmable control system, programmable controller can work normally under the poor working environment, but the structure of control system due to factors such as interference design, installation, sometimes fail. Some problems are thoughtless in system design. According to the experiences and lessons in practice, this paper expounds the programmable control system design problems should be paid attention to. 1, a mature technology used in the system should be at least 75% more than a mature technology is after a certain production practice the test of the programmable controller products or similar design, or to determine production practice in the future, withstand test. Secondly, the design staff to need to use the technology to have experience or has the ability to master it. A programmable control system design and configuration selection of technology and the design scheme is feasible. Because a process control system, once made, to be used for a long time, it is difficult to find the opportunity to modify again and again. Design of the hardware system and software programming, some of which is lacking, may have been hidden in the completed system. In case of damage condition of encounter unpredictable consequences. 2, system hardware structure and the network should be concise and clear don't go for complicated hardware structure, the network configuration don't go for crossover factor is too much, try to use programmable controller itself configuration of network capacity. In the composition of the I/O chassis supporting template, suggested model is simple, consistent and template density shoulds not be too big. Use the connection point of unfavorable and overmuch, from the point of manufacturing process for the chassis and wiring, the input and output wiring density not too high. 3, the function of the control system and the function of the management system should be strict boundaries because of the process control system composed of programmable controller in the real-time demand is very high, and network communication is permitted to temporarily lose a correspondence, later on he can restore, but before restoring the time interval between programmable controller will be out of control. In addition, with multiple programmable controller system is composed of a large system, for the key to master control command, in addition to using programmable controller's own transmits its information network communication, it is better for the use of its I/O point hardware made of interlocking, especially between the processing of emergency 'stop'; Although the two systems are in their own communication scan conversion each 'stop' or 'stop' command, but as a party in scram fault has stopped running, the other party has not received the information we have to stop and run as usual, the unforeseen consequences. Programmable controller of control system is the key to 'stop' should be removed the power of the actuator, then the signal into the programmable controller, which can achieve safety equipment to protect time. 4, the application of programmable controller to concise and readable writing is 'the most' user software, user software can be seen as an orderly 'black box' series, each 'black box' in accordance with the structured language, can be divided into several kinds of typical statements. Each statement mode, the technique can be very monotonous, but must be clear. In design and write these statements, if use reasoning logic relationship is too much, or statements factor is too much, too many special conditions, will make people read these statements are very complicated. As a result, a user programmable controller the readability of the software, the software written for most people to read, understand PLC controller in executing the statement, 'what happened' is very important. Each section of the program to single function and smooth, this is when the software is in use and maintenance of important condition. 5, programmable control system on the hardware and software of the preset, run the test with the key monitoring conditions of programmable control system is configured with color graphic workstation/monitor screen, but from the price and time for the state of the view, monitor screen is not convenient. Key failure, or near the key mechanical equipment, can configure some light, they can be made, the digital output is used to monitor the normal operation of, or used to debug the program, the sign beside the lamp with the function, can help the operator to confirm the normal operation of the programmable control system and reflect the fault in time. 6, the design of large and medium-sized programmable control system don't run out of its hardware and software resources for new system design, hardware to retain at least 15% of redundancy, the software establishment, also needed to estimate the user software of computer resources and consumption. Especially for intermediate relay, the use of counter/timer, to leave room. Because after debugging and running, the software will be modified, supplement, even to prepare. Has been compiled by the software makes it impossible to modify and perfect, it is not practical in engineering.
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