104 Rockwell Automation Publication 2080-UM002G-EN-E - March 2015
Chapter 7 Motion Control
Axis Start/Stop Velocity
Start/Stop velocity is the initial velocity when an axis starts to move, and the last
velocity before the axis stops moving. Generally, Start/Stop velocity is configured
at some low value, so that it is smaller than most velocity used in the motion
function block.
• When the target velocity is smaller than Start/Stop velocity, move the axis
immediately at the target velocity;
• When the target velocity is NOT smaller than Start/Stop velocity, move
the axis immediately at Start/Stop velocity;
Real Data Resolution
Certain data elements and axis properties use REAL data format (single-precision
floating point format). Real data has seven-digit resolution and digit values
entered by the user that are longer than seven digits are converted. See the
following examples.
If the number of digits is greater than seven (7) and the eighth digit is greater than
or equal to 5, then the 7th digit is rounded up. For example:
21474185 rounded to 2.147419E+07
21474186 rounded to 2.147419E+07
If the eighth digit is <5, no rounding is done and the seventh digit remains the
same. For example:
21474181 rounded to 2.147418E+07
REAL Data Conversion Examples
User value Converted to
0.12345678 0.1234568
1234.1234567 1234.123
12345678 1.234568E+07 (exponential format)
0.000012345678 1.234568E-05 (exponential format)
2147418166 2.147418+E09
-0.12345678 -0.1234568
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