2 Nomenclature and Installation
2-4
CJ-series DeviceNet Units Operation Manual for NJ-series CPU Unit(W497)
z Seven-Segment Indicator
In addition to the MS and NS indicators, DeviceNet Units have a 2-digit, 7-segment indicator that nor-
mally indicates the master node address. When an error occurs, the indicator will alternately show
between the error code and the node address of the faulty slave.
There are dot indicators at the lower-right corner of each digit. The left dot indicator shows whether or
not the master is operating and whether the scan list is enabled or disabled. The right dot indicator
shows whether or not the slave is operating.
Seven-segment Digits
Status Display
Remote I/O communications active and
normal
Displays the mas-
ter's node address
(00 to 63)
Lit
From power ON to completion of node
address check (master function disabled,
slave function disabled, or both disabled)
Flashing
Remote I/O communications started Flashing (until
communications
actually start)
From completion of the node address
check until the start of remote I/O com-
munications
Flashing
Error Watchdog timer
error
Not lit
Memory error or
Controller error
Error code only Lit
Other errors Alternately displays the error code and
error node address (see diagram below)
Scan list Reading "- -" Flashing
Registered
Normal: Master Unit's node address
Error: Error code and faulty node address
Indicates whether the slave is operating or stopped.
Indicates whether the master is operating or stopped and
whether the scan list is enabled or disabled.
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