154 Rockwell Automation Publication 5069-UM002A-EN-P - January 2019
Chapter 6 Connect to Different EtherNet/IP Network Levels
Use Socket Object
When the controller operates in Dual-IP mode and uses a Socket Object, you
can use an IP address with a Socket_Create service type. By default this IP
address is INADDR_ANY.
Remember the following:
• If you use INADDR_ANY, IP communication that the Socket Object
instance initiates follows the same routing rules as DNS request routing
rules described in
DNS Request Routing on page 152.
• If you use the IP address of port B1 instead of INADDR_ANY, IP
packets can only go to the port B1 subnet or via its default gateway.
• If you use the IP address of port A1 or port A2 instead of
INADDR_ANY, IP packets can go only to the port subnet or via its
default gateway.
• If you use an IP address other than the port addresses of any controller
Ethernet port or INADDR_ANY, the Create_Socket_Service request
is rejected.
Send Message Instructions
You can send Message (MSG) instructions out the enterprise port or the
device-level port. The only difference between the MSG instruction
configurations is the path.
For more information on how to use MSG instructions, see the
Logix5000™ Controllers General Instructions Reference Manual,
publication
1756-RM003.
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