BECKHOFF KL3681 - Manual (Page 13)

Product overview
2.5 LED Display
Fig. 2: KL3681­0000 ­ LED display
LED Color Meaning
RUN green off K­Bus data transfer not active
on K­Bus data transfer active
Term. Error red on An error has occurred (see status byte [ } 29])
Voltage green on Indicates voltage measurement
Current green on Indicates current measurement
KL3681, KS3681 13 Version 2.0.0