turck BL20-PG-EN-V3 - LED Displays; LED Description BL20

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V01.0| 2016/04
Programmable Gateways BLxx-PG-EN-V3
3.9 LED displays
Every BLxx-PF V3 displays the following statuses via LEDs:
 PLC status (LED RUN),
 application specific LED APPL (freely programmable via CODESYS)
 supply voltage (LED VI/VO, BL67 only),
 common errors (LED ERR) and
 Bus errors (LED BUS)
 2 LEDs for the Ethernet-communication LNK1 and LNK2
3.9.1 LED description BL20
LED GREEN RED Meaning Remedy
GW
OFF OFF No power supply of the CPU. – Check the system power supply at the gateway.
ON OFF Firmware active, gateway ready
OFF blinking Wink-command received
– Wink-command received
LED GREEN RED Meaning Remedy
IOs
off OFF No power supply of the CPU. – Check the system power supply at the gateway.
ON OFF Communication running.
The modules configured corre-
spond to the modules in the sta-
tion.
blinking, 
1 Hz
OFF Station is in the Force Mode of the
I/O-ASSISTANT.
– Deactivate the Force Mode of the I/O-ASSISTANT.
OFF ON CPU not ready for operation, 
possible causes:
– too many modules at the gate-
way
– short-circuit in connected mod-
ule
– gateway hardware error.
– Check the system power supply at the gateway
and the cabling.
– Unmount excessively mounted modules.
– Replace the gateway, if necessary.
OFF blinking, 
1 Hz
Non adaptable changes in the con-
figuration of the module bus
nodes.
– Compare the configured station and the current
configuration.
– Check the physical station for defective or incor-
rectly plugged electronic modules.
OFF blinking, 
4 Hz
no communication
via the module bus.
– At least one module has to be plugged and has to
be able to communicate with the gateway.
blinking, alternating The current and configured mod-
ule list do not match but the data
exchange proceeds as normal.
– Check the physical station for pulled or new but
not planned modules.
– Check the system power supply at the gateway.
OFF blinking 
double 
1 Hz
Device internal communication
disturbed
LED GREEN RED Meaning
APPL
This LED is controlled by the CODESYS program and can be freely programmed by the user.