Baumer FHDx14 IO - Manual (Page 4)

en_BA_FNDx14_FHDx14_IO.doc 4/14 Baumer Electric AG
12.04.2013/hem Frauenfeld, Switzerland
2 IO-Link introduction
These operating instructions contain a description of the most important aspects of the IO-Link interface
which are required for understanding the configuration options. For detailed information about IO-Link and all
specifications, go to www.io-link.com .
IO-Link is a standard interface for sensors and actuators. The device (sensor, actuator) and IO-Link master
are interconnected as a point-to-point connection. Communication between master and device takes place
bi-directionally via the device connecting line. Via this interface values can be read out and it is possible to
configure the sensor via IO-Link. The sensor can be operated in two modes: standard input/output mode
(SIO mode) and IO-Link communication mode.
The master switches the sensor to IO-Link communication mode. In this mode, process data are
continuously sent from the sensor to the master and demand data (parameters, commands) are written to
the device or read off it.
2.1 SIO mode
After start-up the sensor is in SIO mode. In this mode the sensor functions as a normally switching sensor.
On the master side the IO-Link port is switched as a normal digital input. The sensor can be used like a
standard sensor without IO-Link. Diverse functions can, however, only be controlled via IO-Link.
2.2 IO-Link communication mode
With a so-called "wake-up" the sensor is switched by the master into "communication mode". In the process
the master attempts to find a connected device through a defined signal on the switching line. If the sensor
responds, communication parameters are exchanged and afterwards cyclical transmission of process data is
initiated.
In IO-Link communication mode:
•
Process data can be read.
•
Parameters can be read off the sensor.
•
Parameters can be written to the sensor.
•
Commands can be sent to the sensor (e.g. teaching the switching point, restoring to factory setting,
etc.).
In the process data cyclical data such as outputs or quality data are transmitted to the superordinate control.
The master can leave the IO-Link communication mode again with a "fall back", and the sensor continues to
operate in SIO mode until a new "wake up".
In IO-Link communication mode, sensor behavior can be adjusted in SIO mode so that the sensor can easily
be parameterized according to requirements and then operate as a "normal" sensor without the IO-Link
master. Alternatively, the sensor can also be operated in IO-Link communication mode, enabling use of the
full range of functions via process data.