User Manual
Section 5
GFK-2958L
May 2021
Detailed Description of I/O Modules
285
Figure 162: IO-Link communication principle
The IO-Link ports can be operated in IO-Link mode for bidirectional communication or in SIO
mode as digital inputs or outputs. In IO-Link mode, the IO-Link master automatically sets the
right transmission rate for IO-Link communication after activation. The IO-Link master then
checks the identity of the IO-Link device (device comparison). The Data Storage function
ensures correct parameterization of the IO-Link device after replacement of IO-Link device or
IO-Link master without additional programming.
You can parameterize IO-Link devices using a configuration application or by means of
acyclic services. To do so, you will need the device description files from the IO-Link device-
manufacturer (IODDs). You can search for and download IODDs using the “IODDfinder” on
the IO-Link Consortium website.
Note
: You will find more information on IO-Link and IODDs at http://www.io-link.com.
A plug-in connector corresponds to an IO-Link port of type A.
Connector
Connection
Signal
Function
1
C/Q
IO-Link communication
2
L-
GND IN
3
L+
24 V DC IN
4
DI
Digital input (type 1)
The numbering of the channels in the RSTi-EP system differs from the numbering of the IO-
Link port as per the IO-Link specification. The following table shows the assignment of plug-
in connectors and channels to IO-Link ports for the EP-5324 IO-Link communication module.