Mitsubishi Electric MELSEC iQ-R Series Introduction Manual page 17

3.
Configure the buffer area setting for data sampling in the CPU parameter.
[Navigation] window  [Parameter]  CPU module to be used  [CPU Parameter]
3
For the capacity to be specified in the buffer area setting for data sampling in the CPU parameter, the required
size can be checked in the recording setting screen.
3 RECORDING FUNCTION
16
3.2 Recording Setting