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Integration

IO-Link offers the following advantages:

  • Uniform and simple wiring of different devices
  • Device parameters can be changed by the controlling system
  • Remote query of diagnostic information is possible
  • Centralized data management of device parameters is possible

The manufacturer-independent IO-Link standard transmits not only pure process data but also all relevant parameter and diagnostic data from the process level via a simple standard cable. Communication is based on a standard UART protocol with 24 V pulse modulation. A separate power supply is not necessary. The BRS IO-Link device uses three-wire technology and operates at a transmission rate of 230400 bit/s (COM3). The amount of process data is 32 bytes per direction.

Digital Point-to-Point Connection#

IO-Link integrates conventional and intelligent actuators and sensors into automation systems. Mixed operation of conventional and intelligent devices is possible without additional effort.

IO-Link is intended as a communication standard below the classic fieldbuses. The fieldbus-independent IO-Link data can be transmitted at a higher level via the existing communication systems (fieldbuses or Ethernet-based systems).

IO-Link devices can transmit application-specific parameters and data (e.g., diagnostic data) via a serial communication method. Flexible telegram lengths are possible to transmit large amounts of data. Communication is based on a standard UART protocol with 24 V pulse modulation. Only one data line is used for communication, over which both the controller and device telegrams are transmitted. This enables classic three-wire technology.

Three-wire technology
IO-Link supports both the communication mode and the standard IO mode (SIO). Standard IO provides a switching signal on the communication line, as used by simple switching sensors. This mode is only possible with devices that use three-wire connection technology (see Figure 7-1). The SIO mode is supported by BRS IO-Link devices.

kap 7.1.png

Communication mode
The BRS IO-Link device operates in communication mode with frame type 2. With this transmission type, up to 32 bytes of process data in both directions and 2 bytes of on-demand data are transmitted per frame (data block). Process data are the application-specific data, on-demand data can include parameters, service, or diagnostic data.