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11 Programming Devices and Communications
CJ2 CPU Unit Software User’s Manual
11-3 Communications Networks
11
11-2-1 Overview of Serial Communications
z DeviceNet
DeviceNet is a multi-vendor network consisting of multi-bit control and information systems and con-
forms to the Open Field DeviceNet specification. Connecting a DeviceNet Master Unit to the network
enables remote I/O communications between the PLC and the Slaves on the network. Remote I/O
communications enable large-capacity I/O and user-set allocations. Analog I/O Terminals are used
for the Slaves. Message communications are possible between PLCs and between the PLC and
DeviceNet devices manufactured by other companies.
z CompoNet
CompoNet is a high-speed, multi-point, multi-node multi-vendor network used mainly for I/O control.
Connecting a CompoNet Master Unit in the PLC enables remote I/O communications between the
PLC and CompoNet Slaves. High-speed communications are performed with 1,024 points in a cycle
time of 1 ms max. Up to 2,560 points and 384 nodes can be connected.
Messages
Remote I/O
DeviceNet Slaves
DeviceNet
Master Unit
DeviceNet
Master Unit
CompoNet
CompoNet Master Unit
Remote I/O
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