Overview > io-link > IO-Link interface reference IO-Link interface reference The device contains the following IO-Link functions: Primary Functions Identification SmartLight control Segment mode Level mode Runlight mode Flexible mode Ultimate mode Buzzer functionlaity Strobelight functionality Locator Secondary Functions Operating Hours Counter Boot Cycle Counter Voltage and Current Monitoring System Functions Device Status and Detailed Device Status Reset Commands Variant Configuration Process Data Info and Configuration Profile Characteristic Parameter Manager BLOB Firmware Update