Rockwell Automation 1771-QB Linear Pos. - Manual (Page 108)

Formatting Module Data (WRITES)
Chapter 7
7Ć29
Setpoint Block Control Word (word 1)
The setpoint block control word identifies the block as a setpoint block,
specifies the axis or axes for which the setpoints are intended, and indicates the
number of setpoints defined in the block.
Figure 7.38
Setpoint Block Control Word
5007
9
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
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Number of setpoints
(1 to 12), binary
format
Identifies this as
a setpoint block
Destination:
0 1 Axis 1
1 0 Axis 2
1 1 Both Axes
1 0 0 0 0 0 0 0 0
Bit 8 – Axis 1
If this bit is set, the module applies setpoint moves defined in this block to
axis 1.
Bit 9 – Axis 2
If this bit is set, the module applies setpoint moves defined in this block to
axis 2.
Important: If bits 8 and 9 are both set, a single block transfer will update both
axes. You should only set both bits if your application requires that both axes
use the same setpoint moves, i.e., that both axes move in parallel.
Incremental/Absolute Word (word 2)
The incremental/absolute word defines the type of move performed by each
setpoint in the setpoint block:
absolute setpoint moves define a new endpoint in relation to the
zero-position offset specified in the parameter block
incremental setpoint moves define a new endpoint in relation to the current
axis position (if the axis is stationary) or to the targeted endpoint (if the axis
is still in motion)