Application Layer
connection for communication (C) or switching (Q) signal (SIO)
Digital Input
Data Link Layer
Digital Output
Input/Output
IO-Link
IO-Link Device
IO-Link Master
On-request Data
Process Data
Physical Layer
Programmable Logic Controller
Single-drop digital communication interface for small sensors and actuators (SDCI) is the alternative name for the IO-Link-Interface used in the standard IEC61131-9 as IO-Link is a trademark.
Standard Input Output (digital switching mode according to IEC 61131-2)
System Management
Standardized Master Interface
Universal Asynchronous Receiver Transmitter