Epson EM07ZS1647F manual DeviceNet Network Construction, Network Configuration, Node

2. Installation

2.2 DeviceNet Network Construction

Network Configuration

A DeviceNet network is configured as shown in the following figure.

Attach	a	terminating			Ground to
resistor	on	each end			100 Ω or less.
of the trunk line.
	Trunk Line				Trunk Line
	T-branch
	Tap
Drop Line			Drop	Drop
				Line
			Line

Communications

power supply 24 V DC

Trunk Line

T-branch

Tap

Drop Line

Node

Drop Line

				Attach	a	terminating
Power Supply Tap or				resistor	on	each end
T-branch Tap				of the trunk line.
Trunk	T-branch	Trunk T-branch
Line	Connector	Line	Connector		Connector with
T-branch Tap
				Drop	terminating
	Drop
				Line	resistor
Drop Line	Line
T-branch Tap
	Node

Node Node Node

Use DeviceNet cables.

Drop Line	Waterproof	Waterproof
Node	slave	slave

Node

Node

There are two types of the node: master and slave. The master controls a network and gathers data from its slaves. The slaves, including external I/O and other devices, output data in response to the master’s output order and informs the master of its input status.

You can install masters anywhere in the network. You can connect up to 64 nodes (including the master) on your network.

Trunk Line and Drop Line

A trunk line is a backbone cable of DeviceNet network with a terminating resistor on the both ends.

A drop line is a branch of the trunk line.

Terminating
resistor	Trunk Line
	T-branch

Terminating resistor

These are all drop Lines.

-No limits on the number of T-branch

-Limits on the length of drop lines

For DeviceNet, 5-wire cables are used for trunk lines and drop lines. The DeviceNet cables on the market can be used for such cables. There are two types of the DeviceNet cable: Thick cable and Thin cable. Environment-resistant cable and flexible cable are available. For details of cables, see ODVA’s Web site (http://www.odva.org/).

12 Fieldbus I/O Rev.6