Rockwell Automation 1771-QC , D17716.5.25 SER/B SERVO POS User Manual

Page 163

Chapter 8

8Ć2

Once it has a moveset block for each axis, unless it is down to the last two
moves, the 1771-M3 controller normally requests the command block
through the status block.

Figure 8.1

Data Blocks Sent to the 1771ĆM3 Controller Ć Showing Where Address Pointers are Given

Parameter Block

parameter block

first moveset block - axis 1

first moveset block - axis 3

Command Block

First Moveset Block - Axis 1

Contains address pointer for the

second moveset block - axis 1.

Second Moveset Block - Axis 1
Contains address pointer for the

third moveset block - axis 1.

Contains address pointer for:

command block

first moveset block - axis 2

When it gets down to its last two moves of a moveset, the 1771-M3
controller requests another moveset block.

After the parameter block is sent, your program must use the address
pointer from the status block to direct the block transfer write instruction
so that the requested block always transfers to the 1771-M3 controller.

For detailed information on programming block transfer instructions, refer
to the appropriate programming manual as listed in our Publication Index
(publication 499).