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Component Names and Functions Section 3-1
3-1-4 CVM1 and CV-series Controller Link Unit
Wired Unit Indicators
Unit number switches
Two rotary switches. The unit number is set in 2-digit decimal
for the Network to which the PLC is connected.
Indicators
LED indicators that display the Unit and network status.
Node address switches
Two rotary switches. The node address of the Unit on the
Controller Link Network is set in 2-digit decimal.
Baud rate switch
A four-pin DIP switch. The following setting is made.
Pins 1, 2: Baud rate
Pins 3, 4: Not used (always OFF)
Terminal block for the communications cable
Terminals to connect to the Controller Link Network communications
cable (twisted-pair cable).
Terminating resistance switch
A slide switch. Use this switch to set the terminating resistance to ON for
nodes at both ends of the Controller Link Network.
CLK21
X101
X10
0
SW1
ON
BDH
BDL
SHLD
RUN
ERC
TER
ERH
TER SW
1
2
3
4
BAUD
RATE
BAUD RATE
00
INS
SD
M/A
LNK
RD
X10
0
NODE
NO.
X10
1
RSV
10
BIT2 BIT1 RATE
RSV
OFF
OFF
ON
OFF
ON
OFF
2MBP
1MBP
500KBP
UNIT
NO.
X10
1
(Refer to p. 51 and 287)
(Refer to p. 98)
(Refer to p. 98)
(Refer to p. 99)
(Refer to p. 99)
(Refer to p. 66)
Name Color Status Meaning
RUN
(operating)
Green Lit Unit operating normally.
Not lit Unit error.
TER
(terminating
resistance)
Yellow Lit Terminating resistance switch ON.
Not lit Terminating resistance switch 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
participation)
Yellow Lit Unit is participating (inserted) in the net-
work.
Not lit Unit is not participating (inserted) in the
network.
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.