Denso RC5 Specifications download pdf (Page 85)

9.4 Building Up a DeviceNet Network

9.4.1 Network Configuration Sample and Configurators

Nodes

A DeviceNet network has two kinds of nodes: slaves to which external I/Os are

connected, and a master that controls these slaves. Note that their addresses are

just network settings, so the master and slaves can be freely arranged on physical

sites.

Trunk lines and drop lines

The trunk line is a cable whose both ends are terminated with resistors.

A drop line is a cable that branches off the trunk line.

The trunk line and drop lines can be constructed using DeviceNet thick cables,

DeviceNet thin cables, or both.

Thick cables are used for long-distance trunk lines, strong trunk lines, and drop lines.

Thin cables are used for trunk lines and drop lines, and for easy termination

processing.

Terminating resistors

Terminating resistors must be connected at both ends of the trunk line in a DeviceNet

system. The specifications of the terminating resistors are listed below.

• 121 Ω

• Metal film resistor with resistance error of less than 1%

• 1/4 W

Never connect a terminating resistor to a node. This may result in a failure.

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Denso RC5 Specifications Page 85