Network Configuration

• Maximum Network Length and Drop Line Length
  Check that the cables used on the network meet the following specifications.

  Wire Type	Baud Rates	Max. Network Length	Drop Line Length	Total Drop Line Length
  Thick Cable	500 kbps	100 m	6 m	39 m
  	250 kbps	250 m		78 m
  	125 kbps	500 m		156 m
  Thin Cable	500 kbps	100 m		39 m
  	250 kbps	100 m		78 m
  	125 kbps	100 m		156 m

2. Terminating Resistor
   Ensure that two terminating resistors are connected to both ends of the network (trunk line).
   The terminating resistor should be 121 Ω 1/4 W.

3. Cable and Branch Tap
   The cables and branch taps should meet the DeviceNet specifications.

4. Communications Power Supply
   The communications power supply should be dedicated to DeviceNet.
   Do not share the communications power supply with I/O devices.*
   *Noise due to load on/off may affect DeviceNet communications via the communications power supply.
   (The noise causes remote I/O communication error, Busoff detection, and broken unit.)