User Documentation

74 2604080000/03/08.2020Manual u-control

12 LEDindicatorsandtroubleshooting

Controller/indicator LED Status Recommended action

UC20-WL2000-IOT

Power LED PWR green: supply voltage present, rmware is running –

System failure SF red: serious system failure Switch supply voltage off and on again and deploy

application again

Bus failure BF green: communication with modules OK –

red: communication error with module or no modules

connected

Check whether modules are mounted correctly

Maintenance MT greenashingtwice: operating system is running –

Controller status RUN off: no application deployed –

green: application is deployed and running –

Connection/active connection 1 L/A X1 off: no connection Check Ethernet cable

green: connection of controller connection 1 with an

additional eld device

–

green/yellowashing: data being exchanged on

connection 1

Connection/active connection 2 L/AX2 off: no connection Check Ethernet cable

green: connection of controller connection 2 with an

additional eld device established

–

green/yellowashing: data being exchanged on

connection 2

Input supply voltage 3.1 green: input current path supply voltage >18VDC –

3.2 red: input current path supply voltage <18VDC Check supply voltage

3.4 red: internal fuse defective Replace the controller

Output supply voltage 4.1 green: output current path supply voltage >18VDC –

4.2 red: output current path supply voltage <18VDC Check supply voltage

4.4 red: internal fuse defective Replace the controller