Mitsubishi Electric MELSENSOR VS70 Series Setting Manual / Spreadsheet page 68

If a blob is not detected, '#ERR' will be displayed as a dimension value (in the H8 cell).
In that case, when the H8 cell is directly specified, the error affects the WriteDiscrete function (the A14 cell
and A15 cell)
By using the ErrFree function, the error propagation can be prevented.
The formula in the step 1 prevents error propagation by replacing the cell where a blob dimension is
referenced from H8 to A13.
2 BASIC OPERATIONS FOR SPREADSHEET
66
2.8 Establishing Communication