Learning PLC on the basis of the experiment

A required equipment, tools, materials, project are shown in table 1. Table 1 project required equipment, tools, materials, training content according to the previous example explaned, input program, according to the requirements. 1, the project description ( 1) According to provide the principle of PLC wiring diagram wiring; ( 2) Will provide the reference to write PLC controller program; ( 3) According to the operation steps, observe state of input and output equipment. Through the computer monitor screen, observe and record the status of each element and draw the sequence diagram; ( 4) In combination with PLC program execution process, analysis program. 2, 2 training requirements. 1 the wiring diagram and control program according to the figure 1, PLC controller control system hardware connection. Diagram because the signal of pulse signal generator and button input signal is different, therefore, could not use the same COM port. As provide the ladder diagram of figure 2, the use of a computer or handheld programmer written to the PLC controller. 2. More than 2 observations required to exploit the program observe and know the scan cycle and execution process. ( 1) Adjust the frequency of the encoder to 1 KHZ. Press the switch SB1, at this time, the program timing starts the timer, and X0 rise along to reset the counter of the initial value, current value is 0. The number of pulses counter input again. After 1 s clock, time to time, stop counting. How much is the watch counter current value at this time. On the surface, the current value should be in 1000 or so, but in fact the current value is much less, why? ( 2) Adjust the frequency of the encoder to 20 hz. Repeat ( 1) Counter the current value of the operation, observation, and ( 1) What's the difference? Why is that? ( 3) Disconnect SB1, close the encoder power, press the switch SB2, why only two light bright one? Combined with the program execution process analysis. Part 3 sequence diagram analysis after press the switch, relay sequence diagram is shown in figure 3. According to the results of observation, complement other relay sequence diagram.
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