Mitsubishi Electric MELSEC iQ-R Series User Manual page 226

(0) For the CH1 side, designate the receive interrupt-issued designation.
(63) Processing at normal completion
(67) Processing at abnormal completion
(71) Initialize the error information of the CH1 side.
(75) Execute the receive interrupt program.
8 RECEIVING DATA WITH AN INTERRUPT PROGRAM
224
8.5 Considerations when Receiving Data with an Interrupt Program