Mitsubishi Electric MELSEC iQ-R Series User Manual page 560

(6) Sets the send data and writes the number of continuous protocol executions and the protocol number to be executed to the buffer memory of C24 by the
REMTO instruction.
(62) Issues the predefined protocol execution request when the REMTO instruction completes.
(70) Reads the execution result from the buffer memory of C24 by the REMFR instruction when the execution of the predefined protocol completes.
APPENDICES APPENDIX
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Appendix 7 When Connecting the Module to a Remote Head Module