EtherNet/IP Communication Functions
The EtherNet/IP communication functions are used to perform data communications over a network between the RJ71EIP91
and EtherNet/IP devices.
The RJ71EIP91 can perform the following types of EtherNet/IP communications.
• Class1 communications
• Class3 communications
• UCMM communications
With Class1 communications, data communications are performed periodically with establishing connections between the
RJ71EIP91 and EtherNet/IP devices over a network.
Also, Application Trigger can be used to send and receive data with arbitrary timing.
Class1 communications has the following functions.
• Class1 instance communications ( Page 18 Class1 instance communications)
• Class1 tag communications ( Page 27 Class1 tag communications)
With Class3 communications, data are read or written using message communication support commands with establishing
connections between the RJ71EIP91 and EtherNet/IP devices over a network.
Class3 communications has the following function.
• Class3 message communications ( Page 35 Class3 message communications)
With UCMM communications, message communication support commands are used to read and write data without
establishing connections over a network between the RJ71EIP91 and EtherNet/IP devices.
UCMM communications has the following function.
• UCMM message communications ( Page 38 UCMM message communications)
Note that the number of connections for the RJ71EIP91 is the total number for Class1, Class3, and UCMM
For details, refer to the following.
MELSEC iQ-R EtherNet/IP Network Interface Module User's Manual (Startup)
1.1 EtherNet/IP Communication Functions