2 Nomenclature and Installation
2-2
CJ-series PROFIBUS Slave Unit Operation Manual for NJ-series CPU Unit (W510)
2-1 Unit Components
The front view shows the indicators, the rotary switches, and the 9-pin female sub-D PROFIBUS-DP
connector.
The CJ1W-PRT21 has 5 indicators.
During normal operation, the RUN and COMM indicators (green) should be ON, while the ERC, ERH
and BF indicators (red) should be OFF. Refer to 4-1-1 Determining Operating Status from the Indica-
tors.
2-1-1 Nomenclature
2-1-2 Indicators
Three indicators (RUN,
ERC and ERH) give a
status indication of the
Unit in general.
Two indicators (COMM
and BF) are related to
the status of the PROFI-
BUS-DP network.
MACH
NODE
x10
1
x10
0
x10
1
x10
0
RUN
ERC
COMM
ERH BF
Bus
D-SUB 9
Indicators
No.
PRT21
No.
Rotary
switches
connector
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