PLC to realize the three method, continuous motion

simple first look at the working principle of the PLC, when we read the write good program downloaded to the PLC in it begin to scan the user program is the core of its work, the whole scanning process is called an operation cycle as shown in the figure below. First performed to detect the input signal X, then the program such as ladder diagram scanning operation, will be temporarily stored to the internal cache area, the results finally is to the state of the output Y to hardware interface control. Perform the scan sequence is from top to bottom: from the first pair of ladder diagram in turn to the second, third and so on until the last one; From left to right: one by one to the original state of contact logic calculation until the right, then the output component of coil or according to the logic to decide whether to perform an operation such as jump, data processing instructions.

in the scanning process of PLC output generally don't have to wait until the last completed, scan time is short usually has more than a dozen of ms, the us, this to our program structure, PLC controller programming of CPU has much to do, the shorter the time the higher performance. This time can satisfy completely the requirements of general motion control, what you say three continuous motion for PLC control: back and forth, it is very simple, such as the car's starting from the origin to right working point 1, 2, return to the left working point, 3 back to the origin. We just according to the order program, press the start button after X0 began moves to the right, in contact with the right limit X3 after the switch to stop and then left, left to make moves to the right to return to the origin of the limit X4 X2.

PLC's job is to implement suitable control procedures, using simple ladder diagram or SFC ( Sequential function chart) Can realize the continuous motion control and programming simple image

basically two ways to realize:

1. Use ladder diagram, the steps in order to use variables to store, each, implementation step and step by step written action program will execute.

2。 Use step by step instructions or SFC for sequence control, simple and clear, convenient debugging.

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