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Actions to take if communication is not established
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11.4 Detailed diagnostics using the indicators
Details of the situation can be obtained from the illumination pattern of the network unit indicators.
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Network unit indicators and illumination patterns
Part names
Port 2
Port 1
Link/activity LED
Link/activity LED
green (single color) LEDs
Network status LED green (single color) LED
Module status LED green/red (two-color) LED
lit green
flashing green
lit red
flashing red
unlit
Network status (NS) LED
LED status Explanation Comment
OFF Offline
Power is off
IO controller is not connected
Green Online (RUN)
Connection with IO controller is not established
IO controller is in RUN state
Flashing green Online (STOP)
Connection with IO controller is not established
IO controller is in STOP state
Module status (MS) LED
LED status Explanation Comment
OFF Not initialized Power is off, or module is in SETUP or "NW_INIT" state
Green Normal operation Module has transitioned from "NW_INIT" state
Flash green once Diagnostic event Diagnostic event is occurring
Flash green at 1 Hz DCP flashing An engineering tool is being used to identify a node on the network
Red Exception error Module is in the "EXCEPTION" state
Flash red once Setting error Expected ID differs from actual ID
Flash red twice IP address error IP address is not set
Flash red three times Station name error Station name is not set
Flash red four times Internal error A serious error is occurring inside the module
Link/activity LED: Port 1 / Port 2
LED status Explanation Comment
OFF No link A link is not established, and communication is not occurring
Green Link detected An Ethernet link is established, but communication is not occurring
Flashing green Activity An Ethernet link is established, and communication is occurring
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