In order to operate our IO-Link sensor-actuator hubs without an external power supply with outputs on our IO-Link masters, it may be necessary to provide an actuator supply via pin 2.

These instructions are intended to explain the configuration for our IO-Link masters with Profinet from GSDML 2.4x.
For older GSDML versions 2.3x and older, please use the corresponding document.

IO-Link sensor hub is connected to port and SF error is present on the IO-Link master

The diagnostics for the IO-Link port are available via channel diagnostics

In the web server, the event is displayed in the menu of the respective device:

There are two different ways to directly recognize the missing power supply on the device:

1. LED UA does not light up green:





2. LED UA lights up red:

Configuration in the TIA Portal using the GSDML

IO-Link I/O ports" module with and without process data

In this module, the states of pin 2 of the respective ports are mapped via the "BALLUFF 8 Port IO-Link Master" submodule as standard. Example Port 00/ Pin 2 -> E x.0, output Port 07 / Pin 2 A x.7


There is a selection with or without process data for this module

When using the head module with process data for pin 2, only the configuration of the respective port is necessary. Pin 2 can then be switched directly via the process data of the head module.


The behavior of pin 2 can now be set in the module settings of the respective ports. Here it is necessary to set the pin 2 behavior to DO.
In this example, the output can then be switched on accordingly for pin 2 via the address "Q3.0".

When using the head module without process data, the configuration of the respective port is necessary; in addition, an extended module -> outputs pin 2 must be plugged in.

The behavior of pin 2 can now be set in the module settings of the respective ports. Here it is necessary to set the pin 2 behavior to DO.


The "Extended modules" module is required.

The module outputs pin 2 can now be plugged into any slot here. In this process data, the respective pin 2 of the ports can now be activated via output byte 3. In this example, Pin2 of port 0 -> "Q3.0"




Pin2 can then be switched directly via the process data of the head module.

The corresponding ports can now be switched on via the "Outputs Pin2" byte or according to the output address in the "BALLUFF 8 Port IO-Link Master" head module.


To do this, either activate the corresponding output byte as required in the running program or activate it as a test via the watch table.

Pin 2 should be switched immediately (orange LED on IO-Link master port / pin 2) and the diagnostic message should disappear.

The new multiprotocol IO-Link masters (XG5) also offer the option of switching pin 2 to active via the process data.

These are then permanently active as long as the IO-Link master is supplied with the actuator voltage (UA).
It is therefore no longer necessary to switch pin 2 to active.

In this example, port 0 / pin 2 should now be active, the SF LED should be off and the port 0 LED for pin 2 should light up