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Based on PLC LED digital tube dynamic scanning data display design - is analysed Industrial control -
figure 1 double digital tube scan showed PLC driver circuitby PLC controller output end Q1. 0 and Q1. 1 high and low level control in a switch triode, the working state of digital tube to com1 or com2 end cycle with the PLC public M conduction output, to select different digital tube, by PLC output Q0. 0 ~。 7 output corresponding data again according to the common signal to the corresponding digital tube a, b, c, d, e, f, g shows. Through software programming can be realized with a set of start-stop button control two sets of digital tube display the corresponding data. 2 software design by two different functions on the same hardware circuit design software realization example to elaborate the software implementation of a juice. An designing software example 1 this program implementation 0 ~ 99 s repeatedly counting function, press the SB1 start counting, pushing the SB2 make count stop counting in the stop position, then press the start button to start from 0 count, count to 99 after starting from 0 count again. The program ladder diagram as shown in figure 2. May generate the clock pulse counting of 1 s, using the data of PLC, transfer, transform the function of the transmission, processing, changes of count data, then use period of decoding SEG command driven seven segment digital tube, produced by the two timer cycle for 200 ms and reverse phase clock pulse count data control display changes. An designing software example 2 this program function of 50 s countdown pedestrian SB1 starting time, press the SB2 stop time, at the same time, digital tube, and then press the start button to 50 s countdown, timing to 0 s, digital tube out automatically. 2 end design is mainly a double-digit divided into two groups of data in 10 and bits digital tube display, the program adopts cycle control method, then a scan cycle show a set of data, namely the cyclic display two sets of data. Assume that the program scan cycle for 100 ms, timer timer 100 ms, then each set of data update cycle is 100 * 2 = 200 ms, such display frequency enough to meet general industrial control requirements, can be used for real-time display. Also, if the display multiple sets of data, the data line connection is the same, only need to increase the control signal output points of PLC, digital tube common PLC output points of 7 + n, n number of digital tube; Software can be changed slightly. In this paper, the hardware and software design method are debugging success was made in the laboratory, and fully meet the design requirements, and reduce the hardware cost and good results have been achieved.
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