15-3
I/O Response Time in Tag Data Links
Additional Information
This section describes built-in EtherNet/IP ports on the NX and NJ-series CPU Units.
Compared to those built-in EtherNet/IP ports, EtherNet/IP Units, and built-in EtherNet/IP ports
on CJ2H CPU Units (CJ2H-CPU6£-EIP) and CJ2M CPU Units (CJ2M-CPU3£) support differ-
ent data processing performance. For details, refer to 7-4 Tag Data Links with Other Models on
page 7-86.
15-3-1
Timing of Data Transmissions
The following figure shows the timing of transmitting data for tag data link between a built-in
EtherNet/IP port and a CPU Unit.
Data is transmitted at the timing of executing the system common processing 2 of the refreshing task.
I/O refresh
Refreshing
Execution of
programs
System common
processing 1
Control processing
Output data
processing
Input data
processing
System common
processing 1
Motion
control
System common
processing 2
Output data
processing
Primary periodic task
Data received.
Controller
Processing
Data exch
ange processing
Controller task period
You can specify either of the following task types for a refreshing task.
•
Primary periodic task
The primary periodic task has the highest execution priority. It is executed with high speed and high
precision.
• Periodic task
A periodic task is executed during the interval between executions of a primary periodic task.
You do not need to specify a refreshing task for tags (variables) with AT specifications; the tag data is
transmitted as a primary periodic task. (For NX102, NX1P2 and NJ-series CPU Units)
Specify a task type for each tag for tag data link processing.
On the Sysmac Studio, set a refreshing task for each variable assigned as a tag.
Refer to the Sysmac Studio Version 1 Operation Manual (Cat. No. W504) for details on setting refresh-
ing tasks.
15 Communications Performance and Communications Load
15-22
NJ/NX-series CPU Unit Built-in EtherNet/IP Port User’s Manual (W506)
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