Eaton Electrical PROFIBUS-DP EZ204-DP - Manual (Page 185)

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Appendix
What Happens If ...?
Event Explanation Remedy
POW LED not lit No power supply Connect and switch on power
supply
POW LED flashing Data transfer via EZ-LINK OK
BUS LED not lit No PROFIBUS-DP data
communication
Connect and start
PROFIBUS-DP
BUS LED lit Data transfer via PROFIBUS-
DP OK
Slave not signalling – No slave address set
– No bus terminating resistor
present
– Cable, plug faulty
– No power supply
– Set slave address
– Set bus terminating resistors
– Check connection
– Provide power supply to
device
Write command rejected – Command not permissible
– EZ display not on the Status
display
– Change command
– Show Status display
Actual value is zero No actual value present Function relay does not have an
actual value or not triggered