Omron NX Series User Manual page 35

l X Bus Connection which Enable High-speed and Large Capacity Data
Transfer
The NX502 CPU Unit has a built-in X Bus, which is an internal bus capable of transferring data at
higher speed and larger capacity than the NX bus. The NX-series EtherNet/IP Unit is one of the X
Bus Units that are connected to the X Bus.
The X Bus connector is located on the left side of the NX502 CPU Unit. You can connect the NX-
series EtherNet/IP Unit on the left side of the NX502 CPU Unit.
l Up to Ten EtherNet/IP Networks can be Built
The NX-series EtherNet/IP Unit is equipped with two EtherNet/IP ports for EtherNet/IP communica-
tions as standard. Also, you can mount up to four Units to an NX502 CPU Unit. Therefore, includ-
ing the two ports of the built-in EtherNet/IP ports on the NX502 CPU Unit, you can build up to ten
EtherNet/IP networks.
The maximum of ten network segmentation enables large capacity data communications of produc-
tion information, quality information, and equipment information to improve yield rates in production
lines.
Furthermore, flexible and safe line configurations on large-scale assembly lines are possible.
Precautions for Correct Use
The NX-series EtherNet/IP Unit uses IO refresh time to exchange data between the CPU Unit
and the X Bus Unit. Calculate the approximate task execution time to check the effect on the
task execution time.
l Tag Data Links
Cyclic communications between Controllers or between a Controller and other devices are possible
on an EtherNet/IP network.
High-speed data exchange can be performed through tag data links.
Precautions for Correct Use
The I/O refresh time varies depending on the number of connections for tag data link communi-
cations. Check the effect of the number of connections for tag data link communications on the
task execution time.
l CIP Message Communications
You can send CIP commands to devices on the EtherNet/IP network when required by executing
CIP communications instructions in a program.
As a result, it is possible to send and receive data with the devices on the EtherNet/IP network.
NX-series EtherNet/IP Unit User's Manual (W627)
1 Features and System Configuration
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