TECHNICAL BASICS
IO-Link is a fieldbus-independent communication interface for sensors and actuators.
It is based on the IO-Link specification "IO-Link
Interface and System Specification"
version 1.1.2, November 2012, and on the IEC 61131-9 (2013-09), ed. 1.0, "Programmable
controllers – part 9: Single-drop digital communica
tion interface for small sensors and
actuators (SDCI)".
IO-Link is a point-to-point connection between an IO-Link device (e.g. sensor, I/O hub,
valv
e terminal) and the IO-Link master. Up to now, the binary connection was only
designed for transferring switching information, but IO-Link now allows 2 bytes to be
transferred normally in a 2.3 ms cycle via a combined switching status and data channel.
switching information, but IO-Link no
w allows 2 bytes to be transferred normally in a 2.3
ms cycle via a combined switching status and data channel.
Other information can be exchanged in addition to the process values, such as parameters
or diagnostic messages.
This enables communication with sensors and a
ctuators down to the "last meter" to be
established for universal communication.
5
V01.0| 2017/04
TBPN-L1-FDIO1-2IOL - Standard IO-Link
2 IO-Link
2.1 IO-Link - the fieldbus independent communication interface
2.1.1 General technical information
TECHNICAL BASICS
–
Standard I/O-connection technologies in point-to-point connection, unshielded, 20 m wire
length
– Cyclic process data transfer in typ. 2.3 ms
– Parallel service data exchange without any impact on the process data
– Communication via 24 V-pulse modulation, standard UART protocol
– Communication between master and device in 3 different transmission speeds
– 4.800 Baud (COM 1)
– 38.400 Baud (COM 2)
– 230.400 Baud (COM 3)
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