Rockwell Automation Publication 1756-UM022D-EN-P - May 2017 69
Communicate over Networks Chapter 4
EtherNet/IP Connections for Safety I/O Devices
Safety I/O devices on EtherNet/IP networks are added to the project under
the EtherNet/IP communication module as described in
Add Safety I/O
Devices on page 75. When you add a safety I/O device, the Logix Designer
application automatically creates controller-scoped safety data tags for that
device.
Figure 15 - Adding EtherNet/IP Modules to the Project
Standard EtherNet/IP Connections
To use a standard EtherNet/IP module with the safety controller, add the
module to the safety controller project and download the project to the
GuardLogix controller.
1. To configure the module, define the IP address, subnet mask, and
gateway.
EtherNet/IP
Parameter
Description
IP address The IP address uniquely identifies the module. The IP address is in the form xxx.xxx.xxx.xxx.
where each xxx is a number between 0 and 255. However, there are some values that you cannot
use as the first octet in the address:
• 000.xxx.xxx.xxx
• 127.xxx.xxx.xxx
• 223…255.xxx.xxx.xxx
Subnet mask Subnet addressing is an extension of the IP address scheme that lets a site use one network ID for
multiple physical networks. Routing outside of the site continues by dividing the IP address into
a net ID and a host ID via the class. Inside a site, the subnet mask is used to redivide the IP
address into a custom network ID portion and host ID portion. This field is set to 0.0.0.0 by
default.
If you change the subnet mask of an already-configured module, you must cycle power for the
change to take effect.
Gateway A gateway connects individual physical networks into a system of networks. When a node needs
to communicate with a node on another network, a gateway transfers the data between the two
networks. This field is set to 0.0.0.0 by default.
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