Siemens SIMATIC Distributed I/O ET 200eco PN Operating Instructions Manual page 256

Slot "8 DI + 4DO" has its own address space. The scope amounts to one byte inputs and one
byte outputs.
Figure
Figure E-13 Address space of the inputs and outputs of the IO-Link Master 4 IO‑L + 8 DI + 4 DO DC 24V/1,3A 8×M12
IO-Link Master 4 IO-L 4×M12
During the configuration, you can select the address space according to use.
SIO mode
The following figures show the assignment of the address spaces of a submodule/port with
the IO-Link Master 4 IO-L 4×M12, if you have configured the port as digital input or digital
output in SIO mode.
Figure E-14 Address space of the inputs of the IO-Link Master 4 IO‑L 4×M12 in SIO mode
Figure E-15 Address space of the outputs of the IO-Link Master 4 IO‑L 4×M12 in the SIO mode
IO-Link mode
ET 200eco PN
Operating Instructions, 06/2022, A5E01250250-AN
I/O address space
257