Chapter 1 Functions; Ethernet/Ip Communication Functions - Mitsubishi Electric MELSEC iQ-R Series User Manual

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FUNCTIONS
1.1

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
Class1 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)
Class3 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)
UCMM 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
communications.
For details, refer to the following.
 MELSEC iQ-R EtherNet/IP Network Interface Module User's Manual (Startup)
1 FUNCTIONS
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1.1 EtherNet/IP Communication Functions