Data Link Precautions; Data Link Start/Halt Commands - Omron SYSMAC LINK C1000H-SLK21-V1 System Manual

Data Link Precautions

5-7-2 DATA LINK START/HALT Commands

5-8

Data Link Precautions

Set-up and Activation
1, 2, 3...
Adding Nodes
1, 2, 3...
Data link operations can be initiated by issuing a DATA LINK START command
from a CV-series PC or CVSS to the start-up node.
Data link operation can be stopped by issuing a DATA LINK HALT command
from a CV-series PC or CVSS to the start-up node.
Refer to 6-6-1 DATA LINK START and 6-6-2 DATA LINK HALT for details.
Be sure to consider the precautions listed below when activating a data link or
adding a node to an existing data link.
Be sure to consider the precautions listed below when setting up and activating a
data link.
1. Refresh parameters must be set for each node in the data link when manu-
ally generating data link tables. When a data link is started in a node that
doesn't have a data link table, a data link table error will occur and the LNK
indicator on that node will flash.
Refresh parameters must be set for all nodes that are included in the com-
mon link parameters in the start-up node.
2. With automatic generation of data link tables, the start-up node must be one
of the nodes in the data link defined by the settings in AR 07. The node num-
bers of the other nodes in the data link must also be in the range defined by
the settings in AR 07.
For example, if the settings in AR 07 divide the data link area among 4 nodes
(node numbers 1 to 4), node 5 cannot be the start-up node or participate in
the data link.
3. With manual generation of data link tables, the node number of the local
node must be included in the local refresh parameters.
4. If the beginning LR or DM word in the refresh parameters is set too high, the
LR or DM Area will be exceeded during automatic allocation of link words.
If the data area is exceeded in the start-up node, the LNK indicator on the
start-up node will flash and the data link will not operate. If the data area is
exceeded in another node, the LNK indicator on that node will flash and it will
not participate in the data link.
5. Do not turn on the data link activation switch (DIP switch 1, pin 2) on more
than one node. Doing so will not trigger an error, but the start-up node can-
not be correctly determined.
Be sure to consider the precautions listed below when adding a node to an oper-
ating data link.
1. The node number of the node being added must be in the common link
parameters of the operating data link.
2. If the start-up node of the operating data link is using manual generation of
data link tables, the node being added must have its refresh parameters set.
3. If the start-up node of the operating data link is using automatic generation
of data link tables, the common link parameters of the node being added
must match those of the operating data link, or it cannot be a part of data link
operations.
Section 5-8
59