Omron NJ-series User Manual page 67

2 CPU Unit Operation
Tag Data Link Service
 Processing Performed by the Tag Data Link Service
The tag data link service processes communications that use tags with other controllers or devices
on an EtherNet/IP network. You can use the built-in EtherNet/IP port in the CPU Unit or a CJ-series
CJ1W-EIP21 EtherNet/IP Unit to connect to an HMI.
 Operation of the Tag Data Link Service
The tag data link service is executed periodically. The period and the time that is required for each
execution depend on the model of the CPU Unit and on the tag data link settings.
The execution priority of the tag data link service is between the execution priorities of the priority-16
periodic task and the priority-17 periodic task. Therefore, the tag data link service will be given prior-
ity over execution of the priority-17 periodic task, but it may sometimes be interrupted to execute the
primary periodic task or the priority-16 periodic task.
Primary
periodic task
Priority-16 periodic
task
Tag data link
service
Priority-17 periodic
task
The tag data link service is executed with a priority that is between the execution
priorities of the priority-16 periodic task and the priority-17 periodic task.
For details on the tag data link service, refer to 5-2-7 Tag Data Link Service and System Services.
2-8
Task period of Task period of
primary periodic task primary periodic task
Task Task
Task period of periodic task
Task
Task period of periodic task
Interrupted.
Task period of
primary periodic task
Task
Task period of periodic task
Task
Task
NJ-series CPU Unit Software User's Manual (W501)