What is IOLink

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▶ 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/io-link/ • ============================= • In this video, we’re going to learn about IO-Link. IO-Link is a communications protocol that works point-to-point. • A point-to-point communication connection is a communications connection between two separate endpoints or nodes. • IO-Link is bi-directional meaning it works two ways and works over a short distance. • It is primarily used to communicate with sensors and actuators in plant or factory automation processes. • Sensors and actuators are usually connected via Fieldbus connections, allowing them to be in remote locations. • With IO-Link, the field devices, such as actuators or sensors, connect to a ‘Master’ device that communicates to a controller, usually a PLC, or Programmable Logic Controller. • The connection between the IO-Link Master and the field device is established via an unscreened 3 wire cable, no more than 20 meters long. • The IO-Link master is capable of processing digital signals and analog values. • Its versatility means it is capable of integrating into existing systems and can communicate using the industry-recognized Profinet, Profibus, and Modbus, to name a few. • An IO-Link master can have several IO-Link ports or channels. • An IO-Link device can be connected to each port, meaning IO-Link is a point to point communication and not a Fieldbus. • The IO-Link protocol allows an IO-Link port to be operated in one of four different operating modes. • The first mode is the IO-Link mode. This means that the port is used for IO-Link communication. • The second mode is the DI mode. This means that the port acts in the same way as a digital input device. • The third mode is the DQ mode. This means that the port acts in the same way as a digital output device. • The fourth mode is Deactivated. This means that the port is not assigned to any other modes and is reserved for when the port is unused. • IO-Link is a very robust communication system That operates using 24 volts. • Transmission errors can occur for a number of reasons, in general, a cable fault or a power surge can temporarily interfere with transmissions. • An IO-Link device has 4 types of transmission. “Process Data”, “Value Status”, “Device Data”, and “Events”. • The Process Data is considered as the latest state of the sensor or actuator, such as speed. Process Data is transmitted cyclically, which means automatically, at regularly defined intervals. • Up to 32 bytes of process data can be processed, and it’s defined by the high-level controller. • The Value Status indicates whether the Process Data is valid or invalid and is transmitted along with the Process Data cyclically. • The Device Data holds detailed information about a device. • Device Data is transmitted acyclically, at the request of the IO-Link master. Device Data can be read from the device, but also written to. • A device is able to trigger an event, which in turn signals the presence of an Event to the IO-Link Master. An example of an event is an error or warning message, for example, a short circuit, or a device that is overheating. • This information can be used to display indicators or messages on HMI devices, such as error messages signaling a wire break or a communication failure. • An IO-Link device transmits Process Data and Value Status periodically, at a regular defined interval. This is called cyclic transmission. • Device Data, such as diagnostics and Events are transmitted when they are needed. This is called acyclic transmission. • Getting the set up of the IO-Link configuration correct is heavily dependant on the device that is being communicated with, so checking the field devices' instructions is a necessity to be able to communicate correctly. • Don’t worry though, once it is set up, they are very easy to maintain, and often work seamlessly with no additional work required. • • ============================= • Missed our most recent videos? Watch them here: • https://realpars.com/plcnext/ • https://realpars.com/spool-valve-sche... • https://realpars.com/dcs-vs-scada/ • ============================= • 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/U71p6 • ============================= • Like us on Facebook: / therealpars • Follow us on Twitter: / realpars • Follow us on LinkedIn / realpars • Follow us on Instagram / realparsdotcom • #RealPars #Automation #IO-Link

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