Orange: timer
Red: heartbeat
Yellow: HDD
Green: CPU
8 X digital inputs: potial free contact
4 X analog input: configurable 0-10volt / 4-20mA
4 X relay: multicontact
4 X solidstate relay: single contact
UP + reboot: USB update
DOWN + reboot: TFTP update
RIGHT + reboot: boot in u-boot console
ESC + reboot: erase all flash!!