Wiring Formations - Omron CJ Series Operation Manual

3 Wiring Configurations
3-1

Wiring Formations

A CompoNet network can take two wiring formations: Trunk line-Branch line and Unrestricted Wiring.
There are restrictions on the number of branches and the number of Units that can be connected.
Trunk Line-Branch Line Formation
With this wiring formation, the trunk line is differentiated from branch lines.
There are restrictions on the number of branches and the number of Units that can be connected.
Unrestricted Wiring Formation
With this wiring formation, there is no differentiation between the trunk line and branch lines. There are
no wiring restrictions as long as the total cable length for any one segment does not exceed 200 m.
There is also no limit on the number of branches.
Master Unit
Slave Unit
The formation is determined automatically by the type of cable used and the required baud rate.
Cable type
Round Cable I
Round Cable II, Flat Cable
I, or Flat Cable II
*1 Lines cannot be branched from the trunk line if the baud rate is 4 Mbps. Only multidrop connections can be
used for branching from the trunk line.
3-2
Master Unit
Trunk line
Branch Branch
line line
Slave Unit Slave Unit Slave Unit
Segment
Slave Unit
Slave Unit
4 Mbps
*1
Trunk-Branch
*1
Trunk-Branch
CJ-series CompoNet Master Unit Operation Manual for NJ-series CPU Unit (Cat. No. W493)
Terminating
Branch Resistor
line
Terminating
Resistor
Repeater Unit
Slave Unit
Slave Unit
Baud rate
3 Mbps 1.5 Mbps
Trunk-Branch Trunk-Branch
Trunk-Branch Trunk-Branch
Segment
Terminating
Resistor
93.75 kbps
Trunk-Branch
Unrestricted