Omron SYSMAC 3G8F7-CLK13-E Operation Manual page 44

Applications Precautions
Precautions when
Connecting Nodes Using
a Repeater Unit
24
The polling node must not be restarted or reset during data link operation.
If the Controller Link Support Board is the polling node and data links are
operating on the network, do not open the Board for three seconds after clos-
ing the Board.
If the Controller Link Support Board is the polling node and data links are
operating on the network, do not add the Board to the network for three sec-
onds after leaving the network.
When data links are active in the existing network, check the following items
before adding nodes to the network. If the inappropriate data link tables or
parameters are set, the system may not operate properly.
• If the new node will participate in user-set data links, make sure that the
appropriate data link tables are set in the corresponding nodes.
• If the new node will not participate in user-set data links, make sure that
the data link tables of the corresponding nodes are deleted.
• If automatic settings are used, make sure that the appropriate DM Area
parameters have been set.
Before adding nodes, check user programming for the existing network to
confirm that the new data transmissions created by adding new nodes can be
performed. If the ladder program is not suitable, the system may not operate
properly.
Make sure that the node addresses of the new nodes are not already being
used by other nodes in the same network. If the same node address is used
by more than one node, a node duplication error will be detected when the
node is added, communications will stop, and the node with the same
address will not be able to the join the network. Data may also be unexpect-
edly received from the incorrectly set node. To restore a Controller Link Sys-
tem with a duplicated address, reset the node address correctly, then turn ON
the power to the corresponding PCs again, or restart the Controller Link Sup-
port Boards and Units.
Always set the baud rate of the new nodes and the Repeater Unit to the same
baud rate used for the existing network. If a different baud rate is set when
adding a new node, the communications for the whole network including the
existing network will be unstable and communications errors will occur.
Set the terminating resistance of the new nodes to the Repeater Unit as
shown in the following diagram. If terminating resistance is set incorrectly,
communications errors may occur.
• Adding Nodes Using T-branch Lines
System Configuration after Adding Nodes
Terminating
resistance ON
CS1W-RPT01
Repeater Unit
Turn ON terminating resistance at the
nodes on both ends of each segment
shown within broken lines.
Section 1-4
Terminating
resistance ON
Terminating
resistance ON
Newly added nodes
Terminating
resistance ON