Rockwell Automation GMLC Reference Manual - Manual (Page 417)

Publication GMLC-5.2 - November 1999
380 RIO Blocks
Fixed BCD Numeric Format
When you select Fixed from the first Numeric Format menu and BCD
from the second, the values written to the formatted data output group are
the same as with auto BCD numeric format except that the number of
decimal digits (digits to the right of the decimal point) is always the same.
Select the desired number of decimal digits from the Fractional Digits
menu. Fixed format gives a visually more stable display at the expense of
absolute precision. See Auto BCD Numeric Format for details of the
values written to the selected formatted data output group.
Because it writes to a 7-digit BCD magnitude, the maximum value that it
represents is ±9,999,999. This limits the largest value that the motion
controller can write based on the number of specified decimal digits as
shown in the table below.
Be sure to choose the number of decimal digits that best represents the
expected maximum values with the required precision.
Tag Explorer
RIO Formatted Output is pre-selected.
Binary Formatted Data Output Group Maximum Values
Number of
Decimal Digits
Maximum Value
0 ±9,999,999.0
1 ±999,999.9
2 ±99,999.99
3 ±9,999.999
4 ±999.999 9
5 ±99.999 99
6 ±9.999 999
7 ±0.999 999 9