We all know that the controller of the CNC special-shaped sponge cutting machine is controlled by the CNC cutting system, that is, the operation of the entire equipment is controlled by the programmable controller, so as to achieve the cutting of various graphics. So as to achieve cutting the mother of various graphics.

Sponge Cutting Machine Controller Case

Programmable controller (PLC for short) has two working points: input and output information conversion, reliable physical realization, input and output information conversion is mainly realized by running a program stored in PLC memory. This kind of program has both system (this kind of program is also called monitoring program, or numerical control operating system) and user. The system program provides an editing and running platform for the user program. At the same time, it can also perform necessary public processing, such as self-check, I/O refresh, and processing work such as communication with peripherals, host computers or other PLCs. The user program is designed by the user in accordance with the control requirements. What kind of user program is needed for what kind of control method is needed.

Reliable physical realization is mainly through input (I, INPUT) and output (O, OUTPUT) circuits. Each input point or output point has an I or O circuit. Moreover, several such circuits are always integrated into one module (or box), and then several modules are integrated into a complete PLC I/O system (circuit). Although these modules are quite large and account for most of the PLC volume, because they are highly integrated, the PLC volume is not too large.

The input circuit constantly monitors the state of the input point (on, on or off, off), and temporarily stores this state in its input register (may have other names). Each input point has an input register corresponding to it.

The output circuit has an output latch (may have other names). It also has two states, high and low potential state, and can be latched. At the same time, it has a corresponding physical circuit, which can transmit the state of this high and low potential to the output point. Each output point has an output latch corresponding to it.

The input register and output latch here are actually the registers of the PLC I/O circuit. They exchange information with PLC memory through PLC I/O bus and running PLC system program.

The information of the input register is read into the memory of the PLC, which is called input refresh. The PLC memory has a special mapping area for storing input information. Each corresponding bit in this area is called an input relay, or soft contact, or the process-image input register. These bits are set to 1, indicating that the contact is on, and set to 0 to indicate that the contact is off. Since its state is obtained by refreshing the input, it reflects the state of the input point.

The output latch and the output mapping area in the PLC memory are also corresponding. An output latch also has a memory bit corresponding to it. This bit is called an output relay, or output coil, or the process-image output register. Through the PLC I/O bus and running the system program, the state of the output relay will be mapped to the output latch. The completion of this mapping is also called output refresh.

In addition to the input circuit that can receive the switch signal, the PLC sometimes also has the input circuit that receives the analog signal (but the latter must first perform analog and digital conversion, and then store the converted data in the corresponding memory unit of the PLC. .

If you want to generate analog output, it must be equipped with an analog output circuit (called analog output module or unit). Rely on it to perform digital and analog conversion on the content of the PLC's corresponding memory unit, and generate output.

In this way, the program that the user wants to compile is only the transformation from the PLC input-related memory area to the output-related memory area. This is a data and logic processing problem. Because PLC has a powerful instruction system, it is completely possible to write a program that meets this requirement.