User Manual
IO-Link   
10.2 Design of a command point with ID key-operated switch 
  SIRIUS ACT 3SU1 pushbuttons and signaling devices 
228  System Manual, 02/2015, A5E03457306020A/RS-AB/002 
Device LED 
① 
DEVICE (device LED) 
② 
IO-Link 
The device LEDs are used to indicate the correct functioning of the electronic module for 
ID key-operated switches. If a short-circuit or internal fault occurs, this is indicated by these 
LEDs. 
●  Green device LED (DEVICE) lights up: Normal operation 
●  Red device LED (DEVICE) lights up: Fault display 
IO-Link LED 
The IO-Link LED is only used with the electronic module for ID key-operated switches for 
IO-Link, and is inactive with the electronic module for ID key-operated switches. 
●  Normal operation: 
When IO-Link communication functions properly, the green IO-Link LED flashes in 
accordance with the IO-Link communication specification V1.1 (time duration 
approximately 1 second, ON time approximately 0.9 seconds). 
●  Fault display: 
The IO-Link LED shows a red light in the event of IO-Link communication faults. 










