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Chapter 6: DeviceNet
NOTE:
By default, the controller does not supply 24 V power to the DeviceNet
bus. A separate power supply can be used to power the components on the
DeviceNet bus, or the default can be overridden with jumpers. See Power Supply
and the DeviceNet Bus on page 67.
NOTE:
The controller incorporates a 120 Ohm line termination impedance. It is
important that devices connected to the network also have a terminating resistor
connected between CAN-H (white) and CAN-L (blue). See Termination of the
DeviceNet Network on page 66.
Configuring DeviceNet
The SmartController EX motion controller has a default configuration such that, if you plug in
a DeviceNet module configured with a baud rate of 125 kbps, the first 64 inputs and 64 out-
puts will automatically be mapped as the following signals:
MAC_ID 1
l
Input: 1289 to 1352 and
l
Output: 257 to 320
MAC_ID 2
l
Input: 1353 to 1416 and
l
Output: 321 to 384
This makes the DeviceNet plug and play.
For other configurations, use the ACE software for software setup. This assigns the controller
signals to the physical ports of the DeviceNet nodes. Refer to the ACE User's Guide for details
on configuring DeviceNet.
NOTE:
The local setting baud rate must match the DeviceNet node’s setting.
From the ACE software:
1. Double-click on the controller in the tree structure pane.
This will open the object editor for the controller.
2. Click the Configure button, check Configure DeviceNet, and click Next.
3. Follow the on-screen wizard instructions.
6.4 DeviceNet Physical Layer and Media
The DeviceNet physical layer and media specifications are published in the ODVA manual,
chapter 9, volume 1. It describes possible topologies and components of the physical layer.
The figure Trunk Lines and Drop Lines Made of Thick and Thin Cable on page 62 shows sev-
eral possible topologies. The DeviceNet specifications also specify system grounding, mixing of
thick and thin cable media, termination, and power distribution.
The basic topology is the trunkline-dropline topology. This topology uses separate twisted-pair
buses for the distribution of signals and power. The specifications allow trunk lines and drop
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