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model 3000 DeviceNet Module Manual (DN311/DN311A)
Chapter 6 RAS Information (Except for RAS Area in Communication Memory)
6
6.1 Module Status (MS)/Network Status (NS) LEDs
The 2-color light-emitting diode (LED) on the front panel of the DN311 (module status/
network status LED) indicates module status (MS) and network status (NS) in two colors
(green and red) and by ON, blink, and OFF.
Table 6-1 Module Status/Network Status LED
LED Indications Meanings (Main Error)
MS OFF • No power is supplied to the DN311.
• Although power is supplied to the DN311, it is not in
run mode.
If the node address/error code 7-segment LED indicates
the local station node address, power is supplied.
Green ON • DN311 is operating normally.
Green blinking • DN311 is reading switch settings.
Red blinking • DN311 has developed a recoverable error → Switch
setting error (DIP switches/rotary switches), etc.
Red ON DN311 has developed an irrecoverable error (down
state). The module may have to be replaced.
NS OFF • No power is supplied to the DN311 (check MS).
• Although power is supplied to the DN311, it is not in
run mode (check MS).
• DN311 has developed an irrecoverable error (down
state: check MS).
• No network power is supplied to the DN311.
Green ON • DN311 is communicating normally with slave devices.
Green blinking • No communication is established between the DN311
and slave devices.
• Not a single slave device is registered in the DN311.
Red blinking • DN311 is unable to communicate with an abnormal
slave device.
Red ON • Communication halt due to DN311 busoff.
• Communication halt due to a duplicate node address.
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