Application and properties   
1.1 Application, modes and operating modes 
  IE/PB LINK PN IO 
14  Operating Instructions, 11/2017, C79000-G8976-C393-02 
The LINK has two operating modes: 
● 
 
This is the mode that the LINK adopts during normal operation both in PROFINET IO 
proxy and in standard mode. 
● 
 
Functions that can only be executed in maintenance mode: 
–  Firmware download 
–  Restart 
–  Resetting to factory settings 
Access to the three functions of the maintenance mode depends on how the LINK is set to 
the maintenance mode. 
● 
Maintenance mode after startup
 
After startup the LINK is in maintenance mode for 10 seconds and then changes 
automatically to normal mode. In this status only the following function can be executed: 
–  Loading firmware 
● 
Maintenance mode by pressing the button
 
After pressing the button the LINK is in maintenance mode for 10 minutes. The following 
functions are possible: 
–  Restart 
–  Resetting to factory settings 
To change from normal mode to maintenance mode using the button, refer to the section 
Maintenance mode (Page 28).