Functional Classification: EtherNet/IP Communications Switches
Variable name Meaning Function Data type
Range of
values
Reference
_EIP_TDLink-
StartCmd
Tag Data Link Com-
munications Start
Switch
NX-series CPU Units: Change this varia-
ble to TRUE to start tag data links for CIP
communications 1.
It automatically changes back to F
ALSE
after tag data link operation starts.
NJ-series CPU Units: Change this varia-
ble to TRUE to start tag data links.
It automatically changes back to FALSE
after tag data link operation starts.
Note Do not force this switch to
change to F
ALSE from the
user program or from the Sys-
mac Studio. It changes to
FALSE automatically.
BOOL TRUE or
F
ALSE
page 3-60
_EIP1_TDLink-
StartCmd
CIP Communica-
tions1 T
ag Data Link
Communications
Start Switch
Change this variable to TRUE to start tag
data links for CIP communications 1.
It automatically changes back to FALSE
after tag data link operation starts.
Note Do not force this switch to
change to F
ALSE from the
user program or from the Sys-
mac Studio. It changes to
FALSE automatically.
Note You can use this system-de-
fined variable only for NX-ser-
ies CPU Units.
BOOL TRUE or
F
ALSE
page 3-60
_EIP2_TDLink-
StartCmd
CIP Communica-
tions2 T
ag Data Link
Communications
Start Switch
Change this variable to TRUE to start tag
data links for CIP communications 2.
It automatically changes back to FALSE
after tag data link operation starts.
Note Do not force this switch to
change to F
ALSE from the
user program or from the Sys-
mac Studio. It changes to
FALSE automatically.
Note You can use this system-de-
fined variable only for the
NX701 CPU Units and NX102
CPU Units.
BOOL TRUE or
F
ALSE
page 3-60
_EIP_TDLink-
StopCmd
Tag Data Link Com-
munications Stop
Switch
NX-series CPU Units: Change this varia-
ble to TRUE to stop tag data links for CIP
communications 1.
It automatically changes back to F
ALSE
after tag data link operation stops.
NJ-series CPU Units: Change this varia-
ble to TRUE to stop tag data links.
It automatically changes back to FALSE
after tag data link operation stops.
Note Do not force this switch to
change to F
ALSE from the
user program or from the Sys-
mac Studio. It changes to
FALSE automatically.
BOOL TRUE or
F
ALSE
page 3-60
3 System-defined Variables Related to the Built-in EtherNet/IP Port
3-34
NJ/NX-series CPU Unit Built-in EtherNet/IP Port User’s Manual (W506)