Device description
Le
u
ze electronic
MA 255
i
1
9
TNT
35/7-2
4
V
Topology
A bus address is assigned to each participant connected to DeviceNet; this address is
represented by a
MAC ID
(
M
edia
a
ccess
Id
entifier).
Including the master, up to 64 participants can be connected to one network.
Figure 4.4:
Bus topology
Attention!
After DeviceNet specification (Volume 3: DeviceNet Adaptation of CIP Chapter 8, Physical
Layer 8-3.3 Connectors), use of the BUS OUT connection is not allowed.
The topologies presented here are enabled according to the directives of the ODVA.
It possible to connect the participants directly to the master line (trunk line) or to the stub
cable (drop line) via a tap.
On the respective ends of the trunk line (master line), the bus must be terminated with a 120
ohm terminating resistor. The terminating plug is optional and can be ordered separately
(see chapter 14.3 "Accessory terminating resistor").
A cable specified by the ODVA is required for connecting the participants to DeviceNet. Only
cables that satisfy the ODVA specifications may be used.
The limits of network expansion without repeater are specified by the ODVA. The specified
limit values are dependent on the design of the data line.
A distinction is made between "thick cable", "mid cable" and "thin cable".
Terminator
Trunk Line
Terminator
Tap
Drop
Line
Tap
Drop
Line
Tap
Drop
Line
Drop
Line
M12
BUS IN
connector
M12
BUS IN
connector
M12
BUS IN
connector
M12
BUS IN
connector
