Omron NJ Series User Manual

5-23
5 Designing Tasks
NJ-series CPU Unit Software User’s Manual (W501)
5-2 Task System
5
5-2-7 Tag Data Link Service and System Services
The CPU Unit performs processing other than the primary periodic task, periodic tasks, and event
tasks. This processing includes the tag data link service and the system services. The processing that
is performed, the execution priority, and the execution timing for these services are given in the follow-
ing table.
*1 For details on the processing that is performed for tag data links, refer to the NJ-series CPU Unit Built-in
EtherNet/IP Port User’s Manual (Cat. No. W506) or the CJ-series EtherNet/IP Unit Operation Manual for
NJ-series CPU Unit (Cat. No. W495).
*2 Refer to 5-2-8 Processing Performed in and Execution Timing of the Tag Data Link Service for details on
the execution interval and the time that is required for execution of tag data links.
*3 If sufficient time cannot be obtained to execute the system services, the processing of tasks with an execu-
tion priority of 17 or higher will be interrupted to allocate sufficient time. You can set the time for execution of
the system services in the System Service Monitoring Settings on the Sysmac Studio.
5-2-7 Tag Data Link Service and System Services
Item Tag data link service System services
Processing Data is exchanged by using tags with other
controllers and devices on an EtherNet/IP
network. You can use the built-in Ether-
Net/IP port in the CPU Unit or a CJ-series
CJ1W-EIP21 EtherNet/IP Unit to connect to
an HMI.
*1
System services include services with low
execution priority, such as the USB port
service. The system services are executed
in the unused time between execution of
the tasks and the tag data link service.
Execution prior-
ity
The execution priority is between the exe-
cution priorities of the priority-16 periodic
task and the priority-17 periodic task.
The execution priority is lower than that of
any of the tasks.
Execution timing The execution interval and the time that is
required for each execution depend on the
model of the CPU Unit and on the tag data
link settings.
*2
The system services are executed in the
unused time between execution of the
tasks and tag data link service.
*3

Omron NJ Series Specifications

General

Brand	Omron
Model	NJ Series
Category	Controller
Language	English