The implementation of Industry 4.0 in innovative plant and machine concepts in automation technology is based on the so-called “Smart Sensor Technology” i.e. intelligent sensors and actuators with digital communication interface. These are able to transmit various other signals and status messages to the control and data acquisition system in parallel with a switching or measuring signal. Production-related sensor configuration, monitoring of critical operating states or troubleshooting in the event of a cable break or short circuit is also possible via the diagnostic function from a central location or even via remote maintenance. Consistent communication from the lowest field level via the control level to the ERP system – the aim of industry 4.0 – can be achieved with modern sensors.
IO-Link is referred to as the industry’s USB interface of choice for plant and machine control. All reputable manufacturers of programmable logic controllers (PLC) have been involved in the specification and development of this worldwide standardized interface technology according to IEC 61131-9. This means that devices with IO-Link can be used for process automation in all leading fieldbus systems such as Profibus, Profinet or Ethernet, independent of the system and manufacturer.
Another significant advantage of IO-Link is the very simple, fast, reliable and cost-effective wiring via standardized cables and screw connections. Thanks to the interference-free digital signal transmission, measurement uncertainties due to conversion and conversion errors are also eliminated in contrast to analogue transmission technology. The central parameterization of the devices from the highest level of process control contributes to operational safety. After a sensor has been replaced, the identification is automatically checked and the configuration parameters stored in the IO-Link master are transferred to the sensor. And thus, it is impossible to install an incorrect device version or to operate the device incorrectly. The parameters can be set dynamically during operation, automatically via the control system and depending on the material to be produced. An intelligent diagnostic function enables demand-oriented maintenance in the event of a malfunction. To be able to use the devices also in existing process control systems with the classic 0(4)-20 mA signal, the devices have an analogue output in parallel.
_{(Source: KELLER HCW GmbH, Infrared Temperature Solutions (ITS))}