BEI Sensors MHK5 Absolute Hollow Shaft Encoder - Manual (Page 30)

6.3 Status indication by the LEDs in the connection cap
LED grün /
green
LED rot /
red
Two LEDs are implemented in the connection cap.
They optically indicate the status of the encoder in
the profibus network.
The red LED is used to display errors, the green
one displays the status of the encoder. Both LEDs
can have one of three possible conditions: dark,
bright and flashing. Seven of the nine possible
combinations are used to indicate a special
condition.
If there are any problems with starting-up the
system, the state of the LEDs can give important
information about the error cause.
No. Red LED Green LED Status / possible cause
1 Dark Dark No power supply.
2 Bright Bright Encoder is ready for operation but it has not received any
configuration data after power on.
Possible causes: address setting incorrect, Bus lines not connected
correctly.
3 Bright Flashing Parameter or configuration error.
The encoder receives configuration or parameter data with
incorrect length or inconsistent data.
Possible cause: parameter value “total measuring range” too high
4 Flashing Bright The encoder is ready for operation but not addressed by the master
(e.g. incorrect address in configuration).
5 Bright Dark Encoder has not received any data for a longer period (about 40
sec.). Possible cause: bus line has been interrupted.
6 Dark Bright Normal operation in data exchange mode
7 Dark Flashing Commissioning mode
Page 30 BEI Sensors Profibus Manual serie M Revision 03/10