Figure, rounding - PLC wiring diagram objects

Generally refers to the concept of PLC

PLC programmable logic controller. Programmable logic controller is a specially designed for application in industrial environment and digital computing operations electronic systems. It USES a programmable memory, in its internal storage to perform logical operations, sequential control, timing, counting and arithmetic operations such as instruction, through digital or analog input/output control various types of machinery or production process.

PLC basic structure power

power supply is used to convert alternating current into the PLC controller within the required dc j most PLC adopts switch regulated power supply.

the central processing unit ( CPU)

central processing unit (CPU) is the control center of the PLC, also is the core component of PLC, its performance determines the performance of the PLC.

the central processor is composed of controller, logic unit and registers, these circuits are concentrated on a chip, through the address bus, control bus connected to the input/output interface circuit of the memory. The function of the CPU is processing and run the user program, logic and mathematics, control the whole system coordination.

memory

memory is a semiconductor circuit with memory function, its function is storing system program, the user program, logic variables and other information. The system program, the control function of PLC to realize all kinds of application, written by the PLC manufacturer and curing to read only memory ( ROM） The user can not access.

input unit

input unit is PLC and the control device is connected to the input interface, is the bridge of a signal into the PLC, and its role is to receive the command element, the detecting element. The type of input dc input, ac input, ac/dc input. Output unit

output unit and the connection between PLC controller and charged equipment parts, its role is to put the PLC output signal transmitted to the accused of equipment, the central processing unit (CPU) out of the weak current signal into level signal, the driver was accused of actuators of the equipment. Types of the output of the relay output, the output transistor, crystal gate output.

PLC in addition to the above sections, depending on the type of a variety of external devices, its role is to help programming, implementation, monitoring and network communication. Commonly used external devices have programmer, printer, cassette tape recorder, computer, etc.

object wiring diagram of PLC, the input connection mode

Jane think PLC controller input for: GND terminal and X, support all the switch quantity input, select switch is need NPN. No, it always open.

1, the sensor connection:

1) magnetic sensor, 2 line, general Blue ( Blue) GND, Brown ( Brown) The X at the input.

(2) the photoelectric sensor, 3 line, general Blue ( Blue) GND, Black ( Black) At the input X, Brown ( Brown) The 24 v.

2, travel switch, 2 lines, travel switch is not negative, select NO one input X, choose another smokes GND.

the selection of switch power supply, it is best to Taiwan Ming weft switching power supply, dc 24 v output.

Jane think PLC output connection scheme outputs are: COM side and Y, COM termination 0 v, Y for the output control terminals. Jane think of PLC can be directly driven DC24V electromagnetic valve, cylinder within 6 w can directly control the output end, high power load, the power 6 w load, PLC can't direct drive, need to use DC24V intermediate relay switching.

1, the electromagnetic valve selection: if it is 24 v electromagnetic valve is used in the pneumatic control directly, can be directly connected to the controller.

2, hydraulic control valve, hydraulic control is 220 v control commonly, if use controller to control 220 v, need a voltage between excessive, choose 24 v relay switching.

3, general motor control, motor control need two excessive, because 380 v high pressure, need a ac contactor and intermediate relay, can buy 24 v ac contactor.

4, stepping servo motor control, supporting axis movement of Jane, PLC for the step and the model of the servo motor selection without special requirement, PLC can be connected directly to the step/servo motor drive.

Jane think PLC wiring diagram, SF -

1 1616 a2mt wiring diagram

PLC and stepping motor/servo motor connection mode:

2, SF - 1008 a0mt wiring diagram:

3, SF - 0805 a0mt wiring diagram:

recommended reading: article, understand PLC and proximity switch wiring method and the wiring diagram to

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