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13 Communications Performance and Communications Load
NJ-series CPU Unit Built-in EtherNet/IP Port User’s Manual (W506)
13-3 I/O Response Time in Tag Data Links
13
13-3-1 Timing of Data Transmissions
13-3 I/O Response Time in Tag Data Links
Additional Information
This section describes the response time of the NJ-series CPU Unit built-in Ethernet/IP port. 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 dif-
ferent. For details, refer to
7-4 Tag Data Links with Models Other than NJ-Series CPU Units.
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. 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.
This section describes the data processing time required to transfer data between the built-in Ether-
Net/IP port and the CPU Unit.
13-3-1 Timing of Data Transmissions
13-3-2 Built-in EtherNet/IP Port Data Processing Time
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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