Chapter 8: 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 88. 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 87.
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. 8.4 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 84 shows sev- eral possible topologies.
The DeviceNet specifications also specify system grounding, mixing of thick and thin cable media, termination, and power distribution. SmartController EX User’s Guide, 11069-000 Rev. F Page 83 of 92