The motion controller is a special controller that controls the operation mode of the motor: for example, the motor controls the AC contactor by the travel switch to realize that the motor drags the object up to the specified position and then runs downward, or uses the time relay to control the motor to reverse. Or turn around for a while and then turn around for a while and then stop. The application of motion control in the field of robots and CNC machine tools is more complicated than in specialized machines because the latter is simpler in motion and is often referred to as General Motion Control (GMC).
(1) The hardware composition is simple, the motion controller is inserted into the PC bus, and the signal line can be connected to form a system;
(2) It can be developed using a wealth of software already available on PCs;
(3) The code control software has good versatility and portability;
(4) There are many engineers who can carry out development work, and they can develop without much training work.
What is plcProgrammable Logic Controller is a digital computing operation electronic system specially designed for application in industrial environments. It uses a programmable memory that stores instructions for performing operations such as logic operations, sequence control, timing, counting, and arithmetic operations, and controls various types of mechanical equipment or production through digital or analog input and output. process.
(1) High reliability. Since most PLCs use a single-chip microcomputer, the integration is high, and the corresponding protection circuit and self-diagnosis function improve the reliability of the system.
(2) Programming is easy. PLC programming mostly uses relay control ladder diagrams and command statements, the number of which is much less than that of microcomputer instructions. In addition to medium and high-end PLCs, there are only about 16 small PLCs in general. Due to the simplicity of the ladder image, it is easy to grasp, easy to use, and even requires no computer expertise to program.
(3) Flexible configuration. Since the PLC adopts a modular structure, the user can flexibly change the function and scale of the control system simply by combining, so that it can be applied to any control system.
(4) The input/output function modules are complete. One of the biggest advantages of PLC is that for different field signals (such as DC or AC, switching, digital or analog, voltage or current, etc.), there are corresponding templates for industrial devices (such as buttons and switches). , sensor current transmitter, motor starter or control valve, etc.) are directly connected and connected to the CPU board through the bus.
(5) Easy to install. Compared with computer systems, PLC installation requires neither a dedicated machine room nor strict shielding measures. When you use it, you only need to connect the detection device to the I/O interface terminal of the actuator and PLC correctly, and it can work normally.
(6) The running speed is fast. Since the control of the PLC is controlled by the program, regardless of its reliability or operating speed, the relay logic control cannot be compared. In recent years, the use of microprocessors, especially with the large number of single-chip microcomputers, has greatly enhanced the capabilities of PLCs, and the difference between PLCs and microcomputer control systems has become smaller and smaller, especially for high-end PLCs.
The difference between motion controller and plcMotion control mainly involves the control of stepper motor and servo motor. The control structure mode is generally: control device + driver + (step or servo) motor.
The control device can be a PLC system or a dedicated automation device (such as a motion controller, motion control card). When the PLC system is used as a control device, it has the flexibility and certain versatility of the PLC system, but it is very difficult to achieve or program the requirements with high precision, such as - interpolation control, and the reaction is sensitive, and the cost may be high. .
With the advancement of technology and technology accumulation, motion controllers have emerged, which solidify some universal and special motion control functions - such as interpolation commands, users only need to configure and call these function blocks or instructions. This reduces the difficulty of programming, and has advantages in terms of performance and cost.
It can also be understood that the use of PLC is an ordinary motion control device. The motion controller is a special PLC that is dedicated to motion control.
Optical fiber jumpers are used to make jumpers from equipment to optical fiber cabling links. There is a thicker protective layer, which is generally used in the connection between the optical transceiver and the terminal box, and is used in some fields such as optical fiber communication systems, optical fiber access networks, optical fiber data transmission, and local area networks.
Optical fiber jumper (also known as optical fiber connector) means that both ends of the optical cable are equipped with connector plugs to realize the active connection of the optical path; one end with a plug is called a pigtail. Optical Fiber Patch Cord/Cable is similar to coaxial cable, except that there is no mesh shielding layer. In the center is the glass core through which light propagates. In a multimode fiber, the diameter of the core is 50μm~65μm, which is roughly equivalent to the thickness of a human hair. The single-mode fiber core has a diameter of 8 μm to 10 μm. The core is surrounded by a glass envelope with a lower refractive index than the core to keep the optical fiber in the core. On the outside is a thin plastic jacket to protect the envelope.
The classification and overview of optical fiber patch cords are as follows
Optical fiber jumpers (also known as optical fiber connectors), that is, optical fiber connectors that are connected to optical modules, are also available in many types, and they cannot be used mutually. The SFP Module is connected to the LC fiber optic connector, and the GBIC is connected to the SC fiber optic connector. The following is a detailed description of several commonly used optical fiber connectors in network engineering:
â‘ FC-type fiber jumper: The external strengthening method is a metal sleeve, and the fastening method is a turnbuckle. Generally used on the ODF side (most used on the distribution frame)
â‘¡SC type optical fiber jumper: the connector for connecting the GBIC optical module, its shell is rectangular, and the fastening method is a plug-in latch type, without rotation. (Most used on router switches)
â‘¢ST type optical fiber jumper: commonly used in optical fiber distribution frame, the shell is round, and the fastening method is turnbuckle. (For 10Base-F connection, the connector is usually ST type. Commonly used in optical fiber distribution frame)
â‘£LC type optical fiber jumper: the connector to connect the SFP module, it is made by the easy-to-operate modular jack (RJ) latch mechanism
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