▶ C'mon over to https://realpars.com/ where you can learn PLC programming faster and easier than you ever thought possible! ============================= ▶ Check out the full blog post over at https://realpars.com/wireless-communication ============================= Did you know that wireless communication has been used in industrial applications for over 30 years? Yes, and some of the first applications were with the wireless control of Automated Guided Vehicles and Warehouse Cranes. Wireless technologies have become progressively widespread in industrial automation applications for solutions with system integrators, government agencies, and industrial companies. A powerful advantage with wireless networks is that they can be deployed easily to transmit data to areas eliminating the requirement to run expensive cable infrastructures. And in addition to location flexibility, wireless technologies offer real-time communication for applications such as with SCADA and RTU communication, high bandwidth for video transmission used for remote security, and offers a lower total cost of ownership. Electromagnetism is the creation of a magnetic field from the movement of electrically charged particles or movement or interaction between electricity and magnetism such as when a changing electric field generates a magnetic field or with the inverse when a changing magnetic field generates an electric field. This same force is used to transmit radio waves when alternating electric current flows, propagating the signal through internal wires into a transmitting antenna which in turn makes electrons vibrate producing radio waves. Essentially, the antenna radiates the alternating current as an electromagnetic wave, this is where wireless transmission starts. Then the radio waves travel through the air at the speed of light and when these waves reach the receiving antenna, they, in turn, make electrons vibrate within it, reproducing the same waveform generated by the transmitting radio. Various frequencies can be used for different purposes. We call a range of different frequencies a spectrum and are divided into areas of specific usage or bands. Frequency is about how many electromagnetic waves pass through a point of reference every second. Wavelength is the distance measured between the two highest peaks in a wave, this distance is referred to as a period. Within this electromagnetic band of different frequencies, radio waves have the longest wavelengths and the lowest frequencies which allows them to travel the farthest. Some of the specific frequency bands you may be aware of are: – ELF or Extremely low-frequency with a frequency of 3–30 Hz and a wavelength of 105–104 km. – VHF or Very high-frequency with a frequency of 30–300 MHz and a wavelength of 10–1 m. – UHF or Ultra high-frequency with a frequency of 300 MHz to 3 GHz and a wavelength of 1 m to 10 cm. An electromagnet signal does not go straight out to a receiver after being transmitted but radiates the signal in multiple directions. During the journey, waves radiated from multiple paths endure different types of attenuation or weakening and delay. The receiving antenna captures all the waves as a combined signal and when the wave travels more than one route it is called a multipath channel. This multipath generated combined signal, now distorted and mixed must be decoded by the receiver to read the data generated. So, to make the receiver’s job easier we add some additional steps before transmission. Before sending any data, the transmitting components perform the encoding. The encoding operation appends additional bits into the message which makes the data recovery at the receiver much simpler. ============================= Missed our most recent videos? Watch them here: https://realpars.com/vba/ https://realpars.com/remote-io/ https://realpars.com/dde ============================= To stay up to date with our last videos and more lessons, make sure to subscribe to this YouTube channel: http://goo.gl/Y6DRiN ============================= TWEET THIS VIDEO https://ctt.ac/N2602 ============================= Follow us on Facebook: https://www.facebook.com/therealpars/ Follow us on Twitter: https://twitter.com/realpars Follow us on LinkedIn https://www.linkedin.com/company/realpars Follow us on Instagram https://www.instagram.com/realparsdotcom/ #PLC #Wireless #RealPars