Basic Knowledge About Io-Link - Balluff BAW M18MI-BLC50B-S04G Betriebsanleitung

BAW M18MI-BLC50B-S04G
Inductive Distance Sensor
7
Interface
7.1

Basic knowledge about IO-Link

General
IO-Link integrates conventional and intelligent sensors and
actuators in automation systems and is intended as a
communication standard below classic field buses. Field-
bus-independent transfer uses communication systems
that are already available (field buses or Ethernet-based
systems).
IO-Link devices, such as sensors and actuators, are
connected to the controlling system using a point-to-point
connection via a gateway, the IO-Link master. The IO-Link
devices are connected using commercially available
unshielded standard sensor cables.
Communication is based on a standard UART protocol
with a 24-V pulse modulation in half-duplex operation. This
allows classic three-conductor physics.
Protocol
With IO-Link communication, permanently defined frames
are cyclically exchanged between the IO-Link master and
the IO-Link device. In this protocol, both process and
required data, such as parameters or diagnostic data, is
transferred. The size and the type of the frame and the
cycle time used result from the combination of master and
device features (see Device specification on page 11).
Cycle time
The cycle time used (master cycle time) results from the
minimum possible cycle time of the IO-Link device
(min cycle time) and the minimum possible cycle time of
the IO-Link master. When selecting the IO-Link master,
please note that the larger value determines the cycle time
used.
The BAW M18MI-BLC50B-S04G sensor is
designed for protocol version 1.0 and a cycle
time of 5 ms.
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