VT130G3-U-4055 TOSHIBA 可编程逻辑控制器

The VT130G3-U-4055 programmable logic controller PLC is essentially a computer dedicated to industrial control,
Programmable logic controller PLC
The hardware structure of VT130G3-U-4055 is basically the same as that of a microcomputer. The basic structure is:
I. power supply
The power supply of programmable logic controller plays a very important role in the whole system. Without a good and reliable power supply system, it can’t work normally. Therefore, the manufacturers of programmable logic controllers attach great importance to the design and manufacture of power supply. Generally, the AC voltage fluctuates within the range of +10%(+15%), so the PLC can be directly connected to the AC power grid without taking other measures.
Second, the central processing unit (CPU)
The VT130G3-U-4055 central processing unit (CPU) is the control center of the programmable logic controller. It receives and stores the user program and data typed from the programmer according to the function given by the programmable logic controller system program; Check the status of power supply, memory, I/O and alert timer, and diagnose syntax errors in user programs. When the programmable logic controller is put into operation, it first receives the status and data of each input device in the field by scanning, and stores them in the I/O image area respectively. Then, it reads the user programs one by one from the user program memory. After the command is interpreted, the results of logical or arithmetic operations according to the instructions are sent into the I/O image area or data register. After all the user programs are executed, the data in each output state or output register of the I/O image area is finally transmitted to the corresponding output device, and the operation is repeated until the operation stops.
VT130G3-U-4055 In order to further improve the reliability of programmable logic controllers, in recent years, a redundant system with two CPUs or a voting system with three CPUs has been adopted for large programmable logic controllers. In this way, even if one CPU fails, the whole system can still run normally.
Third, the memory
The memory in which system software is stored is called system program memory.
The memory in which application software is stored is called user program memory.
IV. Input/output interface circuit
1. The field input interface circuit consists of an optical coupling circuit and an input interface circuit of a microcomputer, which serves as the input channel of the interface between the programmable logic controller and the field control.
2. The field output interface circuit is integrated by the output data register, gating circuit and interrupt request circuit, and the function programmable logic controller outputs corresponding control signals to the field execution components through the field output interface circuit.
V. Functional modules
Such as counting, positioning and other functional modules.
VI. Communication module.