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Component Names and Functions Section 3-1
Wired Unit Indicators
Note Even when the local node does not participate in the data link, the M/
A indicator will be lit if there are manually set data links active on the
network.
For details, refer to
9-1 Troubleshooting Using Indicators.
Name Color Status Meaning
RUN
(operating)
Green Lit Unit operating normally.
Not lit Unit error.
TER
(terminating resis-
tance)
Yellow Lit Terminating resistance switch is ON.
Not lit Terminating resistance switch is OFF.
ERC (communica-
tions error)
Red Lit Communications error, node address
setting error (same address set twice), or
hardware error.
Not lit Normal operation
ERH
(PLC error)
Red Lit PLC error, PLC interface error, EEPROM
error, unit number error, or I/O table not
set
Not lit No error.
INS
(network participa-
tion)
Yellow Lit Unit is participating (inserted) in the net-
work.
Not lit Unit is not participating (inserted) in the
network.
SD
(send)
Yellow Lit Data transmission.
Not lit No data transmission.
RD
(receive)
Yellow Lit Data reception.
Not lit No data reception.
M/A
(data link mode)
Yellow Lit Manual
(see note)
Note:
M/A is always not lit
when data links are not
active in the network.
Not lit Automatic
LNK
(data link)
Yellow Lit Data links participating.
Flashing Error in data link table.
Not lit Not in a data link or data link inactive.