PLC (Programmable Logical Controller) programmable controllers are widely used in the electromechanical field. The automation control of most equipment or production lines is done by PLC unit or bus. Now PLC programming, whether it is Mitsubishi or Siemens, rarely use programmers, are directly on the computer with special software. Therefore, the use of computer knowledge need not be said, in addition, must understand the industrial transmission process, but also have a better foundation of electrical and electronic, understand the working principle of the relay, know the signal characteristics and applications of various sensors. To realize the application of the PLC bus structure, you must also know the necessary communication knowledge.
PLC is also called programmable controller. To learn PLC programming, you must first learn the composition and structural characteristics of PLC. The PLC input, output and controller are composed of three parts. The controller is the core, and the input and output are the key. The input and output have two kinds of digital signals and analog signals, and the programming of analog signals is complicated.
PLC is very simple, the ladder diagram is clear at a glance, the normally open, which long-closed, and timing, do not need to be set up like the one in the microcontroller, and the anti-interference ability is also strong, you have to learn, then understand the meaning of the program After that, I would like to see more programs written by others, which will help you a lot. Besides, the kernel of PLC is a single-chip microcomputer. In addition, you really can't understand whether there is a statement list, and it is a bit close to the assembly. You can try it.
Since it is from scratch, it must be studied very carefully, because the details determine many problems, and it is to learn hardware knowledge, which is the basis for learning PLC. Then you must experiment on your own and do the above examples. Don't feel hard, because you are starting from scratch. Learning programming also requires a little talent, savvy must be good, usually you can look at the relevant papers, you don't have to understand, see that he wants to do even more.
In order to learn PLC well, we must first solidify the basics of low PLC programming piezoelectric (electrical drag). So what is low voltage electrical? Low-voltage electrical appliances usually refer to circuits whose working AC voltage is less than 1200V and whose DC voltage is less than 1500V. The circuit that controls the function is called low-voltage electrical equipment.
Classification of a low-voltage electrical appliance:
1. Classified by their use or by the objects they control:
(1) Low-voltage distribution electrical appliances, such as knife switches, transfer switches, fuses and automatic switches, etc. are mainly used in low-voltage power distribution systems, requiring accurate operation in the event of system failure.
, reliable work.
(2) Low-voltage control appliances include contactors, control relays, master switches, starters and electromagnets. Mainly used in electric traction automatic control system and power system, requiring long life, small size and reliable operation.
2. Low-voltage electrical appliances are classified according to the action mode:
(1) Automatic electrical appliances are electrical appliances that automatically act according to external signals or changes in physical quantities, such as contactors, relays, etc.
(2) Non-automatic appliances are appliances that are operated by manual or external force, such as button travel switches.
3. According to the executive function of the appliance:
According to the executive function of the electrical appliances can be divided into contact electrical appliances and non-contact electrical appliances. 2. Electrical appliances with contacts include switches, buttons, etc. Non-contact electrical appliances have thyristors, IGBT tubes, etc.
2. The main electric appliance of the main electric appliance belongs to the control electric appliance, which is used for the low-voltage operation of the electric appliance.
(1) Control button The control button is a simple and widely used main electric appliance. It consists of a button cap, a return spring, a bridge contact and a housing.
(2) Normally open and normally closed definitions: normally open (moving) when disconnected, normally closed (opening) when connected
Under the action of external force, the control button first disconnects the normally closed contact, and then connects the normally open contact. When resetting, the normally open contact is disconnected first, and the normally closed contact is closed. The stop button is generally indicated in red and the start button is indicated in green.
(3) Stroke switch The travel switch is also called limit switch. It is generally composed of actuator, operation and housing. There are many types of stroke switches. The structure is divided into direct-acting, micro-motion and rolling.
(4) The working principle of the proximity switch of Huo is mainly composed of Huohe components, voltage regulator circuits, amplifiers, Schmitt trigger OC gates, etc., usually integrated on one chip. When the applied magnetic field strength exceeds the specified operating point, the OC gate changes from a high resistance state to a conduction state, and the output becomes a low level. When the applied magnetic field strength is lower than the release point, the OC gate re-changes to a high impedance state, and the output is High level. So what is the Hall access switch? Definition: A sensor that detects the presence or absence of an object within a distance (a few millimeters to a dozen millimeters) is called an access switch.
(5) Photoelectric switch photoelectric switch is used to detect the proximity of the object, through the state of the photoelectric sensor. Photoelectric switches can be divided into occlusion type and reflection type.
PLC has become an indispensable part of industrial automation. It is widely used because of its simple use, good stability, powerful functions and moderate price. Compared with the cost of general industrial control systems, PLC It is much cheaper and more convenient to program. It can be used in many control systems such as temperature, logic, humidity, pressure, ratio, calculation, man-machine, etc. 80% of modern industry uses PLC control; It is not difficult to find a good job.
Learning is not difficult, and there is no problem with equipment and automation. After learning the PLC of Mitsubishi or Siemens, the work is very easy to find, because PLC is widely used in industrial control, can work in the factory providing automation equipment, can also work in the factory of application automation equipment, and can also specialize in software and system design. As long as you can stand alone, the salary is very high! In Beijing and Tianjin, Tianjin has more environment and opportunities.
PLC is also called programmable controller. To learn PLC programming, you must first learn the composition and structural characteristics of PLC. The PLC input, output and controller are composed of three parts. The controller is the core, and the input and output are the key. The input and output have two kinds of digital signals and analog signals, and the programming of analog signals is complicated.
PLC is very simple, the ladder diagram is clear at a glance, the normally open, which long-closed, and timing, do not need to be set up like the one in the microcontroller, and the anti-interference ability is also strong, you have to learn, then understand the meaning of the program After that, I would like to see more programs written by others, which will help you a lot. Besides, the kernel of PLC is a single-chip microcomputer. In addition, you really can't understand whether there is a statement list, and it is a bit close to the assembly. You can try it.
Since it is from scratch, it must be studied very carefully, because the details determine many problems, and it is to learn hardware knowledge, which is the basis for learning PLC. Then you must experiment on your own and do the above examples. Don't feel hard, because you are starting from scratch. Learning programming also requires a little talent, savvy must be good, usually you can look at the relevant papers, you don't have to understand, see that he wants to do even more.
In order to learn PLC well, we must first solidify the basics of low PLC programming piezoelectric (electrical drag). So what is low voltage electrical? Low-voltage electrical appliances usually refer to circuits whose working AC voltage is less than 1200V and whose DC voltage is less than 1500V. The circuit that controls the function is called low-voltage electrical equipment.
Classification of a low-voltage electrical appliance:
1. Classified by their use or by the objects they control:
(1) Low-voltage distribution electrical appliances, such as knife switches, transfer switches, fuses and automatic switches, etc. are mainly used in low-voltage power distribution systems, requiring accurate operation in the event of system failure.
, reliable work.
(2) Low-voltage control appliances include contactors, control relays, master switches, starters and electromagnets. Mainly used in electric traction automatic control system and power system, requiring long life, small size and reliable operation.
2. Low-voltage electrical appliances are classified according to the action mode:
(1) Automatic electrical appliances are electrical appliances that automatically act according to external signals or changes in physical quantities, such as contactors, relays, etc.
(2) Non-automatic appliances are appliances that are operated by manual or external force, such as button travel switches.
3. According to the executive function of the appliance:
According to the executive function of the electrical appliances can be divided into contact electrical appliances and non-contact electrical appliances. 2. Electrical appliances with contacts include switches, buttons, etc. Non-contact electrical appliances have thyristors, IGBT tubes, etc.
2. The main electric appliance of the main electric appliance belongs to the control electric appliance, which is used for the low-voltage operation of the electric appliance.
(1) Control button The control button is a simple and widely used main electric appliance. It consists of a button cap, a return spring, a bridge contact and a housing.
(2) Normally open and normally closed definitions: normally open (moving) when disconnected, normally closed (opening) when connected
Under the action of external force, the control button first disconnects the normally closed contact, and then connects the normally open contact. When resetting, the normally open contact is disconnected first, and the normally closed contact is closed. The stop button is generally indicated in red and the start button is indicated in green.
(3) Stroke switch The travel switch is also called limit switch. It is generally composed of actuator, operation and housing. There are many types of stroke switches. The structure is divided into direct-acting, micro-motion and rolling.
(4) The working principle of the proximity switch of Huo is mainly composed of Huohe components, voltage regulator circuits, amplifiers, Schmitt trigger OC gates, etc., usually integrated on one chip. When the applied magnetic field strength exceeds the specified operating point, the OC gate changes from a high resistance state to a conduction state, and the output becomes a low level. When the applied magnetic field strength is lower than the release point, the OC gate re-changes to a high impedance state, and the output is High level. So what is the Hall access switch? Definition: A sensor that detects the presence or absence of an object within a distance (a few millimeters to a dozen millimeters) is called an access switch.
(5) Photoelectric switch photoelectric switch is used to detect the proximity of the object, through the state of the photoelectric sensor. Photoelectric switches can be divided into occlusion type and reflection type.
PLC has become an indispensable part of industrial automation. It is widely used because of its simple use, good stability, powerful functions and moderate price. Compared with the cost of general industrial control systems, PLC It is much cheaper and more convenient to program. It can be used in many control systems such as temperature, logic, humidity, pressure, ratio, calculation, man-machine, etc. 80% of modern industry uses PLC control; It is not difficult to find a good job.
Learning is not difficult, and there is no problem with equipment and automation. After learning the PLC of Mitsubishi or Siemens, the work is very easy to find, because PLC is widely used in industrial control, can work in the factory providing automation equipment, can also work in the factory of application automation equipment, and can also specialize in software and system design. As long as you can stand alone, the salary is very high! In Beijing and Tianjin, Tianjin has more environment and opportunities.
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