Connection
T
ag data links updated.
NJ/NX-series Controller NJ/NX-series Controller
Refreshing task
Refreshing task
EtherNet/IP
100
10
10
V
alue of variable
100 → 10
V
alue of variable
Variable c
Variable b
Variable a
Variable c
Variable b
Variable a
Tag set
Variable f
Variable e
Variable d
Tag set
100 → 10
100 → 10
Not refreshed.
Refreshed.
Refreshed.
The
values of
tags in
the tag
set are
not
refreshed
at the
same
time.
Synchronizing the Update Timing of Network Variables (Tags) with
the User Program Execution Period
To have the values of network variables (tags) updated to the latest tag data values each time the user
program that accesses those network variables is executed, set the refreshing task for the network
variables (tags) to the same type of the task as for the user program that accesses the network varia-
bles (tags).
The difference between the operation of tags with a refreshing task that is the same as the user pro-
gram and tags without a refreshing task is described below.
• Tag (network variable) with a refreshing task
The tag is refreshed each time the program with the task that is set as the refreshing task is execut-
ed.
• Tag (network variable) without a refreshing task
The tag is refreshed by the system service. Refreshing is not synchronized to the execution timing
of the program.
The following figures show the refreshing timing of network variables for the respective CPU Units.
NX701 CPU Unit
• The tag data link service is executed without being affected by the tasks and system services.
• The system services are executed at the required time without being affected by the tasks and tag
data link service.
7 Tag Data Link Functions
7-14
NJ/NX-series CPU Unit Built-in EtherNet/IP Port User’s Manual (W506)
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