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4-6
End Node
End Node
Publication 1756-TD008A-EN-P - August 2002
Star Topology Configurations
In the star topology, a hub is placed in the physical center of the link.
The hub acts as a multi-port repeater that contains one receive port
and up to 16 transmit ports. The master node transmitter is connected
to the hub receive port. Nodes are connected to the hub (via direct,
dedicated lines) like points on a star.
Star Topology Configuration #1
In this configuration, ControlLogix SynchLink modules (1756-SYNCH)
are the master node and end nodes.
Figure 4.1
ControlNet
SynchLink
End Node
Table 4.2 lists more information about this configuration.
Table 4.2
Category:
Time synchronization
Data transfer
Restrictions
Typical applications
Master Node
Hub
Hub
End Node
Explanation:
Master -
1756-SYNCH module
Slaves
-
1756-SYNCH modules
The SynchLink node clocks and the CST clocks are synchronized
across all nodes.
· Typically, this configuration is used to transfer axis data.
· Direct and buffered data can also be used in this
configuration. However, direct data does not off any
benefit to the user because there is no data pass through
in a star configuration as in a daisy chain configuration.
None
Motion control
End Node
End Node
42747
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