Rockwell Automation 1771-QC , D17716.5.25 SER/B SERVO POS - Manual (Page 116)

Formatting and Interpreting Data Blocks
Chapter 7
7Ć34
With this bit off, you change the feedrate by the percentage you enter in
the command block when you enable feedrate override in the command
block. However, you change the feedrate for a particular move only if
you had enabled feedrate override in the move block.
With the bit on, you must still enable feedrate override in the command
block and move block before feedrate changes. However, the 1771-ES
expander will not change the feedrate until you close the
feedrate-override-enable input. This allows you to synchronize the
feedrate override of several axes.
Global Accel/Decel Rate
Word 19 (38, 57) specifies the acceleration and deceleration rate the servo
positioning assembly uses for all jogs and for moves in movesets for
which you do not enter local acceleration and deceleration rates. It is also
the deceleration value used when executing a slide stop during manual
mode operation of an axis or when you issue a reset command during axis
motion. (Figure 7.23).
Figure 7.23
Global Accel/Decel Rate Word
17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00
Global Accel/Decel Rate
Word 19 (Axis 1)
Word 38 (Axis 2)
Word 57 (Axis 3)
metric
BCD global accel/dec rate,
(9999 ipm/s or 99.99 mpm/s max)
11045
decimal
point
inch
decimal
point
Decel Step Rate
Word 20 (39, 58) specifies the deceleration step rate (Figure 7.24). This
parameter applies to deceleration of axis motion when the servo
positioning assembly is in the manual mode. At axis feed rates equal to or
less than that specified by this word, the servo positioning assembly
ignores the programmed deceleration rate, and steps axis feed rate directly
to zero. This parameter is not effective in auto mode, and applies only to
jog and search home operations.