I/O Response Time In Tag Data Links; Timing Of Data Transmissions - Omron sysmac NX102-9 Series Owner's Manual

15-3 I/O Response Time in Tag Data Links

Additional Information
This section describes the response time of the NX- and NJ-series CPU Unit built-in Ethernet/IP
ports. The data processing times for the EtherNet/IP Unit, the built-in EtherNet/IP port on the
CJ2H-CPU6-EIP CPU Unit and the built-in EtherNet/IP port on the CJ2M-CPU3 CPU Unit
are different. For details, refer to 7-4 Tag Data Links with Other Models.

15-3-1 Timing of Data Transmissions

The following diagram shows the timing of tag data link transfers between the built-in EtherNet/IP port
and the CPU Unit. Data is transferred when system common processing 2 is performed for the task set
as the refreshing task.
Primary periodic task
Controller
Processing
You can set either of the following types of tasks as the refreshing task.
• Primary periodic task
The primary periodic task has the highest execution priority. It executes processes with high speed
and high precision.
• Periodic tasks
Periodic tasks are executed during the time between executions of the primary periodic task.
You do not need to specify a refreshing task for tags that use an AT specification. Data is transferred for
these tags during the primary periodic task (for NX102 CPU Units, NX1P2 CPU Units, and NJ-series
CPU Units). The task during which to perform tag data link processing is specified for each tag. Set the
refreshing task on the Sysmac Studio for each variable you want to set as a tag. Refer to the Sysmac
Studio Version 1 Operation Manual (Cat. No. W504) for details on setting refreshing tasks.
NJ/NX-series CPU Unit Built-in EtherNet/IP Port User's Manual (W506)
15 Communications Performance and Communications Load
I/O refresh
Refreshing
System common
processing 1
Controller task period
Data received.
Control processing
Execution of
programs
Data exchange processing
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