8
Series 70
Servo NXT - EtherNet/IP
Installation, Operation and Maintenance Manual
4.4 LED Description
4.4.1 Ethernet Link
This yellow LED indicates the status of the Servo NXT EIP ethernet link. If it is on, then the link is good,
and communication can occur. In addition, this LED also shows link activity. It blinks whenever an
ethernet packet is transmitted or received.
Table 2: Network Status Indicator
(from Section 9-4.3.3 of The CIP Networks Library, Volume 2, EtherNet/IP Adaptation of CIP, Ed. 1.26,
Apr 2020)
Indicator
State:
Summary
Requirement
Steady
Off
Not Powered
No IP Address
The device is powered off, or is powered on but with no IP address
configured (Interface Configuration attribute of the TCP/IP Interface
Object).
Flashing
Green
No
Connection
An IP address is configured, but no CIP connections are established, and
an Exclusive Owner connection has not timed out.
Steady
Green
Connected
An IP address is configured, at least one CIP connection (any transport
class) is established, and an Exclusive Owner connection (defined in
Volume 1, Chapter 3) has not timed out.
Flashing
Red
Connection
Timeout
An IP address is configured, and an Exclusive Owner connection
(defined in Volume 1, Chapter 3) for which this device is the target has
timed out. The network status indicator shall return to steady green
only when all timed out Exclusive Owner connections are reestablished.
Devices that support a single Exclusive Owner connection shall transition
to steady green when any subsequent Exclusive Owner connection is
established.
Devices that support multiple Exclusive Owner connections shall retain
the O->T connection path information when an Exclusive Owner
connection times out. The network status indicator shall transition from
flashing red to steady green only when all connections to the previously
timed-out O->T connection points are reestablished.
Timeout of connections other than Exclusive Owner connections shall
not cause the indicator to flash red.
The Flashing Red state applies to target connections only. Originators
and CIP Routers shall not enter this state when an originated or routed
CIP connection times out.
Steady
Red
Duplicate IP
For devices that support duplicate IP address detection, the device has
detected that (at least one of) its IP address is already in use.
Flashing
Green/Red
Self-Test
While the device is performing its power up testing, the network status
indicator shall perform a test sequence as described in Section 9-4.1.4
Note:
when a single indicator is used to represent multiple IP address interfaces the state of any one
interface shall be sufficient to modify the indicator state (per the above behavior in the table).
• Transition to flashing green when any one interface receives an IP address
• Transition to steady green when a CIP connection is established on any interface (and Exclusive
owner is not timed out).
• Transition to flashing red when an Exclusive Owner CIP connection times out on any interface.
• Transition to steady red when any of the interfaces detects an IP address conflict.
