This section explains CompoNet.
CompoNet is an open network developed by Open DeviceNet® Vendors Association (now, ODVA) in 2007. As with DeviceNet®® and EtherNet/IP®, this network uses the Common Industrial Protocol (CIP), and is designed for data links to sensors and actuators with small numbers of I/O points.
Wiring Method and Communication Protocol
A total of four wires, two signal wires and two power supply wires, are used for wiring.
This network uses round connector cables or flat cables, and supports bus and tree topologies. The transmission rate can be selected from 93.75 kbps to 4 Mbps and the wiring distance can be extended up to 1500 m (4921.3′) (at a transmission rate of 93.75 kbps).
Round connector cable and flat cable
As with DeviceNet®® and EtherNet/IP®, this network supports CIP. Communication is performed using a combination of multicast and time-division multiple access (TDMA), which is faster than conventional polling communication.
Multicast transmission + TDMA
Time management using TDMA
Multicast reduces the numbers of commands and responses.
TDMA controls response timing.
In a CompoNet network, the master communicates with slaves using the master/slave method. Unlike conventional polling communication, the master sends commands to all slaves simultaneously (multicast), and the timing at which slaves send data is adjusted using TDMA to prevent collisions between signals from slaves. There is no need to send commands to each slave individually, reducing time required for communication.
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