7 Tag Data Link Functions
7-52
NJ-series CPU Unit Built-in EtherNet/IP Port User’s Manual (W506)
Tag data links are automatically started immediately after the data link parameters are downloaded
from the Network Configurator. (They are automatically started after the CPU Unit’s power is turned ON
or the Unit is restarted.)
You can start and stop tag data links for individual devices from the user program or from the Network
Configurator.
Precautions for Correct UsePrecautions for Correct Use
Use the same method (i.e., either the user program or the Network Configurator) to both start
and stop tag data links. For example, if you use the _EIP_TDLinkStopCmd (Tag Data Link Com-
munications Stop Switch) system-defined variable stop tag data links, you cannot start them
from the Network Configurator.
z Using Commands in the User Program
You can change the corresponding elements in the following system-defined variables to TRUE in
the user program to start and stop tag data links for individual devices. (Refer to Section 3 System-
defined Variables Related to the Built-in EtherNet/IP Port.
)
• _EIP_TDLinkStartCmd (Tag Data Link Start Switch)
• _EIP_TDLinkStopCmd (Tag Data Link Stop Switch)
Additional Information
Change the Tag Data Link Start Switch to TRUE, while the Tag Data Link Communications Stop
Switch is FALSE. If the Tag Data Link Stop Switch is TRUE, the tag data links do not start even if
the Tag Data Link Start Switch is changed to TRUE. Furthermore, if the Tag Data Link Start
Switch and the Tag Data Link Stop Switch are both TRUE, an error occurs, the Multiple Switches
TRUE Error system-defined variable changes to TRUE, and the event is recorded in the event
log.
z Using the Network Configurator
You can select I/O Connection
−
Start or I/O Connection
−
Stop from the Network Menu to start
and stop tag data links for individual devices.
z Using the Network Configurator
You can start and stop tag data links for individual devices using the Connection Tab Page in the
Monitor Device Dialog Box. This applies only to tag data links for which the device is the originator.
Select
Monitor from the Device Menu to access the Monitor Device Dialog Box.
7-2-10 Starting and Stopping Tag Data Links
Automatically Starting Tag Data Links
Starting and Stopping Tag Data Links for Individual Devices
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