12-3
Tag Data Link I/O Response Time
The following shows how to calculate the guideline for the tag data link I/O response time.
12-3-1
Timing of Data Transmissions
This section describes the timing of transmitting data for tag data link between an NX-series
EtherNet/IP Unit and a CPU Unit.
The NX-series EtherNet/IP Unit and the CPU Unit transmit data during I/O refresh time.
Two types of tasks can be set to perform I/O refreshing, primary periodic task and priority-16 periodic
task. Tasks to perform I/O refreshing of tag data links are specified for each tag set. Refer to I/O
Refreshing of X Bus Function Module in the NJ/NX-series CPU Unit Software User’s Manual (Cat. No.
W501) for details on the settings.
12-3-2
Maximum Tag Data Link I/O Response Time
The following shows how to calculate the guideline for the maximum tag data link I/O response time.
Precautions for Correct Use
The numerical values that are obtained by the calculation described here shall be used as a
guideline for the maximum tag data link I/O response time. Always confirm the execution times
with the physical Controller and study the designs before starting actual system operation.
You can calculate the maximum tag data link I/O response time by adding up the time of (1) to (5) in
the following figure.
12 Communications Performance and Communications Load
12-23
NX-series EtherNet/IP Unit User's Manual (W627)
12-3 Tag Data Link I/O Response Time
12
12-3-1 Timing of Data Transmissions
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