14 Communications Performance and Communications Load
14-22
NJ/NX-series CPU Unit Built-in EtherNet/IP Port User’s Manual (W506)
14-3 I/O Response Time in Tag Data Links
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-CPU6ï‚£-EIP CPU Unit and the built-in EtherNet/IP port on the CJ2M-CPU3ï‚£ CPU Unit
are different. For details, refer to 7-4 Tag Data Links with Other Models.
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.
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 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 Oper-
ation Manual (Cat. No. W504) for details on setting refreshing tasks.
14-3-1 Timing of Data Transmissions
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 exchange processing
Controller task period
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