Control Techniques UD77 DeviceNet Startup Manual page 11

5. Connect the DeviceNet Nodes together using suitable DeviceNet Physical Media.
A. For a development and evaluation DeviceNet network, Thin Cable (P/N 1485-P1-C) is
suitable for use on the open-style daisy-chain, the single main Trunk Line that makes up
the DeviceNet network.
B. Larger, practical networks on "real" control systems with many DeviceNet "devices" use
Thick Cable (P/N 1485-A1-A) for the Main Trunk and Thin Cable (P/N 1485-P1-C) on the
Drop Lines. Such networks usually also include additional DeviceNet parts such as
"Taps", "DeviceNet Connectors", and "Terminating Plugs" to facilitate connection of
network devices.
C. The 1747-SDN Scanner and the 1770-KFD DeviceNet connectors are color coded to
indicate conductor location.
D. The DeviceNet open-connector terminal strip on the UD77TB is not color-coded. See
illustrations for guidance.
6. Mount and connect one or more suitable +24 VDC Power Supply or Supplies.
A. For a development and evaluation DeviceNet network, the 24 Volt DC available from the
SLC 500 modular power supply can also be used to provide the DeviceNet +24 Volt DC
supply. As this supply is not regulated, and the DeviceNet specification states that this
voltage must not be above 25 Volts DC, it is prudent to measure and insure that the
voltage is not above 25 Volts DC, once power is applied to the network. A one-to-three
amp switching +24 Volt DC supply (in a DIN rail format) is otherwise recommended.
B. On larger, practical networks on "real" control systems with many DeviceNet "devices",
the use of one or more regulated +24 Volt supplies and "Power Taps" are an important
part of the design and specification of a DeviceNet network. Documentation and
software tools to assist in this portion of specifying a "real" DeviceNet system can be
found in manuals listed in the Appendix.
RS-232 to PC
7. Terminate each end of the Main Trunk Line with a 121-ohm 0.25 Watt resistor.
See the following illustrations for guidance.
Photo of 1747-KFD serial RS-232 DeviceNet interface
Page 11 of 77
DeviceNet to rest of network