Epson EM07ZS1647F manual Installation Thick Cable, Terminating Resistor, Node Connection

2. Installation

Thick Cable Thin Cable

11.2 to 12.1 mm outside diameter

Shield Wire

Braid Shield			6.9 mm outside diameter
	Signal Wire			Braid Shield
					Signal Wire
	(Blue/White)				(Blue/White)
	Power Wire				Power Wire
	(Red/Black)	Shield Wire			(Red/Black)

Communication Cable Signal

Wire Type	Color	Details of Signal		Wire Identity
Signal wire	Blue	Signal	Low	CAN L
	White	Signal	High	CAN H
Power wire	Red	Communications Power	Positive	V+
	Black	Communications Power	Negative	V
Shield wire	-	Shield		S

Terminating Resistor

To reduce reflections of communication signal, terminating resistors should be attached on both ends of the trunk line. For DeviceNet, nodes have no terminating resistor on the ends.

Attach 121 Ω +/-1%, 1/4W terminating resistors between the signal wires (CAN-H and CAN-

L)of the trunk line cable. Some T-branch taps and connectors can accept terminal resistors. Molded terminating resistors with connectors are also available to attach to environment- resistant T-branch taps and connectors.

Node Connection

Nodes can be connected to a DeviceNet network by the following topologies: tree, multi-drop, T-branch, daisy chain. For tree topology, there is no limitation of daisy chain layer but drop line length is limited. For details of drop line length, refer to the following section “Drop Line Length”.

Terminating		Branch Tap Terminating
Resistor	Trunk Line	Resistor
		Daisy Chain

Tree Multi-drop T-branch

Communications Power Supply

DeviceNet supplies 24V DC communications power to each node via 5-wire cables. You can install the communications power supply at any location on the DeviceNet network. We recommend providing a dedicated communications power supply on the network separately even though it is possible to share power among the communications power supply, node internal circuit power supply, and I/O power supply.

Shield Ground of Signal Wire

Ground the DeviceNet network at one point with 100 Ω or less.

As a noise countermeasure, you can leave the network ungrounded. For details, refer to the 4. Troubleshooting.

Fieldbus I/O Rev.6 13