Mitsubishi Electric MELSEC iQ-R Series User Manual page 304

(3) Frame No. 8001H setting: registration 1 to 4
Frame No. 8002H setting: registration 1 to 4
Frame No. 8005H setting: registration 1 to 4
Start frame No. designation for receiving: 1 to 4
Final frame No. designation for receiving: 1 to 4
Receiving method designation: 2 to 3 - Method 1 designation
Method 1 dedicated receive end data quantity: 2 to 3
Set User frame use enable/disable designation to "Enable".
(105) Reception ready
(112) Read combined number.
Specify the reception channel.
Set the allowable number of data to be received.
Issue the INPUT instruction execution direction.
(172) Normal completion
(174) Abnormal completion
15 DATA COMMUNICATIONS USING USER FRAMES
302
15.3 Program for Data Reception with User Frame