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In the manufacturing industry, there are a large number of open-loop sequential control based on switching value. It acts in sequence according to logical conditions, and the number acts in sequence; In addition, the interlocking protection action is controlled according to the logical relationship independent of sequence and timing; And a large number of switching value, pulse value, timing, counter, analog quantity out of limit alarm and other state quantity based discrete quantity data acquisition and monitoring. Due to these control and monitoring requirements, PLC has developed into a product mainly replacing relay circuit and sequential control. PLC manufacturers have gradually increased various communication interfaces on the original CPU template, and the fieldbus technology and Ethernet technology have also developed synchronously, making the application scope of PLC more and more extensive. PLC has the advantages of stability and reliability, low price, complete functions, flexible and convenient application and convenient operation and maintenance, which is the fundamental reason why it can occupy the market for a long time. The hardware of PLC controller itself adopts building block structure, including motherboard, digital I / O template, analog I / O template, special positioning template, bar code identification template and other modules. Users can obtain the desired I / O quantity by expanding on the motherboard or using bus technology to equip remote I / O slave station.
While realizing various quantities of I / O control, PLC also has the ability to output analog voltage and digital pulse, so that it can control all kinds of servo motors, stepping motors, variable frequency motors, etc. that can receive these signals. Coupled with the man-machine interface support of touch screen, PLC can meet your needs at any level in process control.
In the design of PLC system, the control scheme should be determined first, and the next step is the engineering design and selection of PLC. The characteristics and application requirements of process flow are the main basis for design and selection. The programmable logic controller and related equipment shall be integrated and standard, and shall be selected according to the principle of easy integration with the industrial control system and easy expansion of its functions. The selected programmable logic controller shall be a mature and reliable system with operation performance in relevant industrial fields, and the system hardware, software configuration and function of the programmable logic controller shall adapt to the device scale and control requirements. Being familiar with PLC, function chart and relevant programming languages can shorten the programming time. Therefore, during the selection and estimation of engineering design, the characteristics and control requirements of the process shall be analyzed in detail, the control task and scope shall be defined, and the required operations and actions shall be determined. Then, according to the control requirements, the input and output points, the required memory capacity, the function of PLC and the characteristics of external equipment shall be estimated, Finally, the programmable logic controller with high performance price ratio is selected and the corresponding control system is designed.
Appropriate margin shall be considered when estimating I / O points. Generally, according to the statistical input and output points, an additional 10% ~ 20% expandable margin shall be added as the estimation data of input and output points. When actually ordering, the input and output points shall be rounded according to the product characteristics of the manufacturer's programmable logic controller. [5]
The memory capacity is the size of the hardware storage unit provided by the programmable controller itself. The program capacity is the size of the storage unit used by the user application project in the memory, so the program capacity is less than the memory capacity. In the design stage, because the user application program has not been prepared, the program capacity is unknown in the design stage and needs to be known after program debugging. In order to estimate the program capacity during design and selection, the estimation of memory capacity is usually used instead. There is no fixed formula for the estimation of memory capacity. Many literature materials give different formulas, which are generally 10 ~ 15 times of digital I / O points, plus 100 times of analog I / O points. This number is the total number of words in the memory (16 bits is a word), and the margin is considered as 25% of this number.
The selection includes the selection of operation function, control function, communication function, programming function, diagnosis function, processing speed and other characteristics