Delta Electronics RTU-DNET User Manual

DVP-PLC Application Manual 

31

There are five LED indicators on RTU-DNET. POWER LED displays if the power of RTU-DNET is working 

normally. RUN LED displays the working status of RTU-DNET. ALRAM LED shows if RTU-DNET is operating 

normally. NS LED and MS LED display the communication connection status of RTU-DNET. 

6.1 POWER LED 

LED status 

Indication 

How to correct 

Off 

Power is abnormal. 

Make sure RTU-DNET is powered. 

Green light on 

Power is normal. 

-- 

6.2 NS LED 

LED status 

Indication 

How to correct 

Off 

No power or duplicate ID 

check has not completed.   

1.  Make sure RTU-DNET is powered. 
2.  Make sure the nodes on the bus are 

communicating normally. 

3.  Make sure at least 1 node or more are 

communicating on the network through 
RTU-DNET. 

4.  Check if the baud rate of RTU-DNET is the 

same as that of the master. 

Green light blinking 

On-line but not connected to 

DeviceNet 

-- 

Green light on 

On-line and connected to 

DeviceNet normally 

-- 

Red light blinking 

On-line but I/O connection 

timed-out 

-- 

Red light on 

Network error, cannot check 
duplicate ID, no network 
power or bus-off 

1.  Make sure all the devices have their unique 

node address. 

2.  Check the network for correcting media 

installation and baud rate. 

3.  Check if the node address of RTU-DNET is 

valid. 

4.  Check if the network power is normal. 

6.3 MS LED  

LED status 

Indication 

How to correct 

Off 

No power or off-line 

Make sure RTU-DNET is powered. 

Green light blinking 

Waiting for I/O data, no I/O 
data or PLC is in STOP 
mode. 

Switch the PLC to RUN status and start I/O data 
exchange. 

Green light on 

I/O data are normal. 

-- 

Red light blinking 

No network power; 
configuration error 

1.  Check if the network power is normal. 
2.  Reset the parameters in RTU-DNET. 

Red light on 

Hardware error 

Send your RTU-DNET back to the factory for repair.

6.4 ALARM LED  

LED status 

Indication 

How to correct 

Off Normal 

-- 

Red light blinking 

RTU-DNET detects low 

1.  Make sure RTU-DNET is powered.