Quickly understand Pepperl+Fuchs module AS-InterfaceG20

Keywords: photoelectric switch photoelectric switch manufacturer photoelectric switch model photoelectric switch price photoelectric switch wiring diagram photoelectric switch principle photoelectric switch type photoelectric switch application

Photoelectric switch:

The photoelectric switch is the abbreviation of the photoelectric proximity switch. It utilizes the shielding or reflection of the light beam by the detected object, and the circuit is connected by the synchronization loop to detect the presence or absence of the object. Objects are not limited to metal, all objects that can reflect light (or block light) can be detected. The photoelectric switch converts the input current into a light signal on the transmitter, and then the receiver detects the target object according to the intensity or presence of the received light. The common photoelectric switch smoke alarm in the security system is often used in the industry to count the number of movements of the robotic arm.

Photoelectric switch model:

The photoelectric switch is a kind of sensor, which converts the change of the intensity of light between the transmitting end and the receiving end into the change of current to achieve the purpose of detection. Since the output circuit and input circuit of the photoelectric switch are electrically isolated (ie, electrically insulated), it can be used in many occasions. A new generation of photoelectric switch devices manufactured using integrated circuit technology and SMT surface mounting technology has intelligent functions such as delay, widening, external synchronization, anti-interference, high reliability, stable working area and self-diagnosis. This novel photoelectric switch is an active photoelectric detection system electronic switch that adopts pulse modulation. The cold light sources it uses include infrared light, red light, green light and blue light, etc., which can be non-contact and rapid without damage. And control the state and action of various solids, liquids, transparent bodies, black bodies, soft bodies and smoke. It has the advantages of small size, multiple functions, long life, high accuracy, fast response speed, long detection distance and strong resistance to optical, electrical, and magnetic interference.

Photoelectric switch manufacturers:

Use optical elements to change the light beam in the middle of the propagation medium; use the light beam to reflect the object; make the light beam return instantaneously after being emitted over a long distance. The photoelectric switch is composed of three parts: transmitter, receiver and detection circuit. The transmitter is aimed at the target to emit a beam, and the emitted beam generally comes from a light emitting diode (LED) and a laser diode. The beam is emitted continuously, or the pulse width is changed. The radiation intensity of the pulsed beam has been selected many times in the launch, and it runs towards the target without indirectly. The receiver is composed of a photodiode or phototransistor. In front of the receiver, optical components such as lens and aperture are installed. Behind it is the detection circuit, which can filter out the effective signal and apply the signal.

Working principle of photoelectric switch:

After the modulated pulse generated by the oscillation circuit passes through the reflection circuit, the light pulse is radiated from the luminous tube GL. When the measured object enters the range of the light receiver, the reflected light pulse enters the photosensitive transistor DU. The photoelectric switch demodulates the optical pulse into an electric pulse signal in the receiving circuit, and then is amplified by the amplifier and synchronized gating and shaping, and then the interference is eliminated by digital integration or RC integration, and finally the driver is triggered by a delay (or no delay) Output photoelectric switch control signal. Photoelectric switches generally have good hysteresis characteristics, so even if the detected object shakes in a small range, it will not affect the output state of the driver, so that it can be kept in a stable working area. At the same time, the self-diagnostic system can also display the light receiving status and stable working area to monitor the work of the photoelectric switch at any time.

Types of photoelectric switches:

The amplifier separation type is to separate the amplifier and the sensor, and is made with a dedicated integrated circuit and a mixed installation process. Because the sensor has the characteristics of ultra-small and multi-variety, the amplifier has more functions. Therefore, this type adopts the terminal block connection method and can be used for both AC and DC power supplies. With on and off delay function, you can set the light and sound switch, can control 6 kinds of output states, and have two output modes of contact and level.

The built-in type of amplifier integrates the amplifier and the sensor. It is made by ASIC and surface mounting technology, and it works with DC power supply. Its response speed situation (there are two kinds of 0.1ms and 1ms), can detect small and high-speed moving objects. Changing the polarity of the power supply can switch between bright and dark movement, and can set the self-diagnostic stable work area indicator. Both voltage and current output modes can prevent mutual interference, which is very convenient in system installation.

The built-in power supply unit integrates the amplifier, sensor and power supply device, and is made with a dedicated integrated circuit and surface mount technology. It generally uses AC power and is suitable for replacing contact type limit switches at the production site, and can be directly used for strong current control circuits. You can also set self-diagnostic stable working area indicator lights by yourself. The output is equipped with SSR solid state relay or relay normally open and normally closed contacts, which can prevent mutual interference and can be installed tightly in the system.

Photoelectric switch price:

Strong light source: The photoelectric switch can generally work stably when the ambient illuminance is high. However, it should be avoided that the optical axis of the sensor faces strong light sources such as sunlight and incandescent lamps. When the angle between the optical axis of the sensor (receiver) and the strong light source cannot be changed, a light-shielding plate or a long light-shielding tube can be installed around the top of the sensor.

Mutual interference: MGK series of new photoelectric switches usually have the function of automatically preventing mutual interference, so there is no need to worry about mutual interference. However, when several groups of HGK series through-beam infrared photoelectric switches are installed in parallel and close to each other, the adjacent groups and mutual interference should be prevented. The most effective way to prevent this kind of interference is to set the emitter and the receiver crosswise, and open the group distance when more than 2 groups. Different frequency models can also be used.

The effective way of HGK series reflective photoelectric switch to prevent mutual interference is to open the interval. And the farther the detection distance is, the larger the interval should be, and the specific interval should be determined according to the debugging situation. Of course, models with different operating frequencies can also be used.

Photoelectric switch wiring diagram:

The slot photoelectric switch is usually a standard U-shaped structure. The transmitter and receiver are located on both sides of the U-shaped groove and form an optical axis. When the detected object passes through the U-shaped groove and blocks the optical axis, the photoelectric switch The detected switch signal is generated. The slot photoelectric switch is safer and more suitable for detecting high-speed changes and distinguishing transparent and semi-transparent objects.

Optical fiber photoelectric switches use plastic or glass optical fiber sensors to guide light, so as to realize the detection of objects not in the vicinity. Generally, fiber optic sensors are divided into through-beam type and diffuse reflection type.

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Photoelectric switch article:

The G20 Pepperl+Fuchs module minimizes the workload required for motor wiring and meets the pre-assembly requirements of the flexible conveyor section. In conveyor applications, it realizes effective control of DC electric rollers.

In warehouse applications, engineers responsible for electric roller conveyor systems face some challenging requirements. The actual problem they want to solve is that they must ensure that the various needs of customers meet the requirements of processing speed, reliability, energy efficiency, and cost. Pepperl+Fuchs launched the G20 series of AS-i interface modules, which are designed for DC motorized roller (MDR) application requirements, and are specifically designed and developed to meet your customer applications with speed, cost and energy efficiency.

The G20 module minimizes the workload required for motor wiring and provides a brand new way. Through its tailor-made functions, G20 ensures the reliable operation of the motor and realizes the pre-assembly of flexible conveyor sections. It is specially designed for conveyor manufacturers and their customers to realize the rapid installation and commissioning of the motor and improve the overall efficiency of use.

The installation depth of the G20 module is only 27mm, which is very suitable for installation in an electric roller conveyor system, and the wiring is completely concealed. Mechanical installation is very easy, no additional installation tools are required. The module is encapsulated by a durable plastic shell that is resistant to shock and vibration and has an integrated design, thereby eliminating time-consuming and laborious component installation. The convenient M8 connector design for G20 module input (sensor) and output (DC electric roller) effectively reduces connection costs and overall complexity, and improves system installation speed.

The following is the product introduction of G20 Pepperl+Fuchs module!

Better installation method of conveyor section

Once the module is connected to the conveyor system, the flat cable is crimped in the G20 module through insulation piercing technology, and the master station is connected to the slave station to form the conveyor bus network system. This simpler, faster and more effective method of network wiring helps transmission system manufacturers and customers to free themselves from complicated and time-consuming wiring procedures, and shortens the wiring process of most traditional motor starter equipment hard-wiring. The entire conveyor network system (G20 drive module with AS-i interface and all other control modules) can be easily controlled in sections by ASI bus-pre-assembled, ready to convey, tested, and independently expanded of.

A variety of DC electric roller control options and high safety standard requirements

In terms of functionality and safety, G20 series modules are second to none. The module is equipped with 2 sensor input terminals, 2 DC electric roller control output terminals, and 2 DC electric roller power monitoring terminals. The module provides a maximum 5A starting current for each output. Through a variety of configurable speed parameter settings, it accelerates the ramp configuration function, and conveniently changes the characteristics of the rotation direction of the electric roller, which interprets the application flexibility of the G20 module. In addition, the G20 module provides a built-in integrated fuse short-circuit protection for each DC electric roller to prevent the DC electric roller from over-current and burn the module.

As a supplement to the G20MDR module, another member of the G20 series, pure digital control, is an ideal solution designed for valve control, in-position switches, brake signals, and drive signals. In short, these modules redefine MDR control and provide conveyor manufacturers with tools to meet the needs of their customers.

Highlights of G20 Pepperl+Fuchs modules at a glance

Suitable for conveyor systems in logistics applications to achieve speed, rotation direction, start/stop and other functions control

Provides a simple ON/OFF solution for electric motors or pneumatic actuators

Installation to the conveyor system is very simple and tool-free installation

Flat cable connection integral housing design, can be directly connected to the actuator/sensor

Modules facilitate section management-pre-assembled, ready for transportation, tested