2-3
2 Nomenclature and Installation
CJ-series DeviceNet Units Operation Manual for NJ-series CPU Unit(W497)
2-1 Nomenclature and Functions
2
2-1-1 Nomenclature and Functions
z Status Indicators: MS and NS
The MS (Module Status) indicator indicates the status of the node itself and the NS (Network Status)
indicator indicates the status of the network.
The MS and NS indicators can be green or red and they can be OFF, ON, or flashing (alternating 0.5-s
ON and 0.5-s OFF). The following table shows the meaning of these indicator conditions.
Note The indicators flash at a 0.5-s interval.
Indi-
cator
Color Status Meaning (likely errors)
MS Green Lit Normal operating status
Communications are being performed normally.
Red Lit A non-recoverable, major fault has occurred.
(Watchdog timer error, memory error, or system error.)
Replace the DeviceNet Unit.
Flashing A recoverable, partial or minor fault has occurred. (Con-
figuration Error, Switch Setting Error, CPU Unit initializa-
tion error, CPU Unit interface error, or Routing Table
Error.)
Correct the error and reset the Unit.
--- Not lit Power isn't being supplied or the Unit is being reset.
NS Green Lit The Unit is Online with the network and remote I/O com-
munications have been established with a slave regis-
tered in the scan list or message communications have
been established.
Flashing The Unit is Online with the network, but neither remote
I/O communications nor message communications have
been established. Either the scan list is being read, or
both remote I/O communications and message commu-
nications are disabled.
Red Lit A major fault in communications has occurred. Network
communications are not possible.
(Node address duplicated or Bus Off error)
Flashing A partial or minor fault in communications has occurred.
(Communications Error, Structure Error, or Verification
Error)
--- Not lit The Unit is not Online with the network. (There is no net-
work power supply, the Unit is being reset, a partial or
minor fault or a sending error has occurred.)
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