turck BL20 Series - 6.5.2 Diagnostic and status messages

Power Distribution Modules
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6.5.2 Diagnostic and status messages
The diagnostic functions monitor the supply voltages (system and field supply) supplied by the user
for undervoltage. They indicate errors via ”DIA” LED and transmit corresponding diagnostic infor-
mation to the gateway.
LED status displays
LED Display Meaning Remedy
DIA Red,
flashing
0.5 Hz
Faulty power supply to
the field U
L
or system
U
sys
.
Check the wiring to the system supply and to the field
supply.
Check if the voltages of the system and field supply are
in the permissible range..
Red Module bus communi-
cation failure
Check if more than two ad-joining electronics modules
have been pulled.
Check the wiring to the system power supply.
Off No error messages or
diagnostics
–
V
cc
Green 5 V
cc
-power supply for
module bus OK
–
Off 5 V
cc
-power supply for
module bus faulty.
Check the voltage and the wiring for the system supply.
Sys Green System supply via exter-
nal power supply unit
OK
–
Off System supply via exter-
nal power supply unit
faulty
Check the wiring to the system supply.
Check the external power supply unit.
U
L
Green Field supply via
external power supply
unit OK
–
Off Field power supply via
external power supply
unit faulty
Check the wiring to the field power supply.
Check the external power supply unit.