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7-13
7 Tag Data Link Functions
CJ-series EtherNet/IP Units Operation Manual for NJ-series CPU Unit (W495)
7
-1 In
tr
o
duct
ion
to
T
a
g
Data L
inks
7
7-1
-7 Con
c
urrency of T
ag D
ata Link D
ata
Maintaining Concurrency in the Tag Data in a Tag Set
To maintain concurrency in the values of multiple tags in a tag set, the tags (variables with a Network
Publish attribute) must satisfy the following four conditions.
(1) The tags must be assigned to the same tag set (connection).
(2) A refreshing task must be set for the network variables assigned to the tags, and the
refreshing task must be the same for all tags in the tag set.*
Note
If you set a refreshing task for a network variable, you must set a variable access time to allocate enough
time to access the network variable from outside of the Controller.
(3) A tag that uses AT specification must not be included in the same tag set.
(4) The variable access time set for each task must be set to a higher value than is
required to transfer the tag data. Refer to
12-3-3 Effect of Tag Data Links on Task
for details on the variable access time and data transfer.
•
Setting Refreshing Tasks for Tags (Network Variables)
Concurrency of the tags in the tag set is maintained.
Additional Information
You do not need to set a refreshing task for variables (tags) that use an AT specification because
they are updated in the primary periodic task.
NJ-series Controller
NJ-series Controller
Connection
Tag data links updated.
Refreshing task
Refreshing task
EtherNet/IP
10
10
10
Value of variable
100
→
10
100
→
10
100
→
10
Value of variable
Variable c
Variable b
Variable a
Variable c
Variable b
Variable a
Tag set
Variable f
Variable e
Variable d
Tag set
The values of the
tags in the tag set
are refreshed at
the same time.
Summary of Contents for SYSMAC CJ1W-EIP21
Page 8: ...Manual Structure 6 CJ series EtherNet IP Units Operation Manual for NJ series CPU Unit W495...
Page 42: ...Revision History 40 CJ series EtherNet IP Units Operation Manual for NJ series CPU Unit W495...
Page 68: ...1 Introduction 1 26 CJ series EtherNet IP Units Operation Manual for NJ series CPU Unit W495...
Page 266: ...9 FTP Server 9 20 CJ series EtherNet IP Units Operation Manual for NJ series CPU Unit W495...
Page 431: ...Index 1 CJ series EtherNet IP Units Operation Manual for NJ series CPU Unit W495 I Index...
Page 436: ...Index 6 CJ series EtherNet IP Units Operation Manual for NJ series CPU Unit W495 Index...
Page 437: ......