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CJ-series Controller Link Units Section 4-2
4-2-1 Overview
Unit Number
Node Address
Baud Rate
Note Factory default setting is in bold.
Terminating Resistance
4-2-2 Unit Number
Set the unit number for each Unit using the rotary switches on the front of the
Unit. The unit number is used to identify a CPU Bus Unit within the PLC. Any
unit number can be set between 0 and F in hexadecimal (00 to 15 in decimal).
Set the node address using a small flat-blade screwdriver, being careful not to
damage the rotary switches.
Note 1. Always turn OFF the PLC’s power before setting the unit number.
2. When setting a Unit for the first time or changing the existing setting, create
a I/O table in the PLC’s CPU Unit.
3. Do not set the same unit number twice within the same PLC. An error will
occur if the same unit number is set for two different Unit, and the CPU Unit
will not be able to recognize the Units.
4. When the Unit is recognized by the PLC’s CPU Unit, “NS” will be shown in
the I/O table displayed for the CX-Programmer programming device.
UNIT
No.
RUN
CLK21-V1
ERC INS
ERH M/A LNK RD
NODE
No.
x10
1
x10
0
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
0
TER
SD
1
2
3
4
5
6
7
8
9
0
1
2
3
4
5
6
7
8
9
BAUD
RATE
1
2
ON
SW1
ON
TER SW
BD H
BD L
SHLD
ON
1
2
UNIT
No.
NODE
No.
x10
1
x10
0
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
0
1
2
3
4
5
6
7
8
9
0
1
2
3
4
5
6
7
8
9
BAUD
RATE
1
2
ON
SW1
ON
1
2
Setting range Nodes
01 to F (default is 0) All nodes in the Network
Setting range Nodes
01 to 32 (default is 01) All nodes in the Network
Pins Baud rate Maximum
transmission
distance
Nodes
Pin 1 Pin 2
OFF OFF 2 Mbps 500 m Set same
rate for all
nodes in the
Network.
ON OFF 1 Mbps 800 m
OFF ON 500 Kbps 1 km
ON ON Cannot be set.
Front switch Terminating
resistance
Nodes
OFF
(factory default)
Not connected All nodes in the Network
Turn ON the terminating resis-
tance at the nodes at both
ends of the Network and turn it
OFF at all other nodes.
ON Connected
Item Specifications
Setting method Single-digit hexadecimal
Setting range 0 to F (decimal 00 to 15, default is 0)
Node All nodes in the Network
UNIT
No.
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
Note: The factory default settings are shown.