Cable Types, Maximum Distances, And Number Of Slave Units - Omron CJ Series Operation Manual

1 Introduction
1-2-1

Cable Types, Maximum Distances, and Number of Slave Units

This section provides specifications on the maximum cable length and the maximum number of con-
nectable Slave Units for each type of cable. The cables and Units must be used within the specifica-
tions.
Master Unit
Repeater
Unit
Sub-
Sub-trunk
trunk
line
line
Slave Units
Sub-trunk
line length
Baud Rate of 4 Mbps (No branching allowed.
Length per trunk line or sub-trunk line
Branch line length
Total branch line length
Restrictions on branch line locations
Number of connected Slave Units (including
Repeater Units)
*1 There are restrictions when you branch lines or use Flat Cable II. For details, refer to 1-2-2 Branch Line and
Multidrop Support for Cable Types and Baud Rates.
Baud Rate of 3 Mbps
Length per trunk line or sub-trunk line
Branch line length
Total branch line length
Restrictions on branch line locations
Number of Units per branch (See note.)
Maximum sub-branch line length
Total sub-branch line length
Number of connected Slave Units (including
Repeater Units)
Note This is the maximum number of Slave Units and Repeater Units combined that can be connected to a branch
line by using multidrop connections and/or T-branching. T-branching creates a sub-branch.
1-12
Trunk line length
Trunk line
Repeater Unit
Branch line
Branch line
Repeater
Unit
Sub-
trunk
line
Sub-trunk
line
Item
30 m
Lines cannot be branched from the trunk line. (Only multidrop
connections are possible from the trunk line or sub-trunk lines.)
32
Item
30 m
0.5 m
8 m
3 branches / m
1
Not supported
Not supported
32
CJ-series CompoNet Master Unit Operation Manual for NJ-series CPU Unit (Cat. No. W493)
Branch line length
Branch
line
Branch
Branch
Sub-branch
line
line
line
Repeater
Unit
Sub-trunk
line
Branch
lines
Sub-branch
line
*1
)
Round Cable I or II
Round Cable I or II
: Slave Unit
: T-branch
: Multidrop
: Terminating Resistor
Terminating Resistor
Slave
Repeater Unit
Unit
Branch
line
Branch
lines
Repeater Unit
Sub-trunk
line
Slave Units
Flat Cable I
30 m
32
Flat Cable I or II
30 m
0.5 m
8 m
3 branches / m
1
Not supported
Not supported
32