Mitsubishi Electric MELSEC iQ-R Series User Manual page 344

(0) Set the request number for Class3 tag communications, and start EtherNet/IP communications.
(36) By turning on M100, "M+RJ71GN11_SE_EIP_Class3Originator_WriteTagData" is executed and a write request is sent to the server side.
When M120 is on, the set size of data stored in D1000 or later is written to Tag001 on the server side as the parameters for Class3 communications.
(610) By turning on M101, "M+RJ71GN11_SE_EIP_Class3Originator_ReadTagData" is executed and a read request is sent to the server side.
When M121 is on, the server-side response result is stored in D2000 or later according to the response data size stored in D3204.
Ensure that the request number to be set is not the same as the request number used for other UCMM
communications.
13 PROGRAMMING
342
13.6 Class3 Tag Communications Communication Example