Overview Of The Componet Network - Omron 3G8F7-CRM21 User Manual

Overview of the CompoNet Network

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Overview of the CompoNet Network

High-Speed
Communications of
Multiple Nodes
Greater Flexibility with
Repeater Units
2
CompoNet is a field network designed for communications between the input
and output components on the shop floor and a personal computer (or PC) or
a PLC. CompoNet requires less wiring labor but provides high maintainability.
The PC and the CompoNet Slave Unit exchange input and/or output data
cyclically through a CompoNet Master Board.
By using explicit messages, users can read data from the CompoNet Slave
Unit or write data into it.
Repeater
Unit
Terminating
Resistor
Here are the main features of CompoNet:
CompoNet can provide remote I/O communications for multiple nodes as
many as maximum 2,560 points in a high speed such as 1000 points per
millisecond when the data rate is 4 Mbps*. This allows integration of
conventional system configuration with basic I/O Units into a CompoNet
network.
* The data rate of 4 Mbps does not support T-branch connection. Thus any
Slave Unit with pre-attached cables is not usable.
Repeater Units can expand a network installation in the following ways:
• Extending the Communications cable,
• Increasing the number of connected nodes,
• Creating a branch connection from the trunk line, and
• Converting cable types.
Repeater Units can be used to expand the trunk line for up to two layers. The
lines downstream from the Repeater Units are called sub-trunk lines. The
maximum number of connectable Repeater Units is 64 per Master Board and
32 per trunk line.
Note The power to the sub-trunk lines must be supplied from the Repeater Units.
CompoNet Master Board
Slave Unit
Terminating Resistor
Repeater Unit
Slave Unit
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Terminating
Resistor
Slave Unit
Slave Unit