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

Page 152

Advertising
background image

Formatting and Interpreting Data Blocks

Chapter 7

7Ć70

Bit 7 Auto/Manual

Bit 7 selects the mode of operation of the servo positioning assembly:

On = Auto Mode - In auto mode, the servo positioning assembly can

execute movesets you have programmed, according to operator
commands such as start, begin, next move, EOM stop, escape, slide
stop.

Off = Manual Mode - In manual mode, moveset execution is

suspended, and the servo positioning assembly can execute jog, preset,
home and other manual mode commands.

Bit 10 Reset

Turn on bit 10 to generate a reset command. This command re-initializes
all axes when the servo positioning assembly is in manual mode. Issue
this command to recover from an immediate stop condition. This
command is not recognized, and the status block indicates a programming
error, when this bit is on with the servo positioning assembly in auto
mode.

If an axis is in motion when this command is issued, the axis performs a
slide stop at the global deceleration rate in the parameter block. After the
axis stops, the 1771-M3 controller acknowledges the command through
the status block.

Important: The reset command affects all axes controlled by a 1771-M3
controller. Motion of all axes must stop before the reset command is
acknowledged.

The reset command is similar to power-up. That is, all 1771-M3
controller memory is cleared by a reset, including presets and
accumulated offsets. However, it is unlike power-up in that the actual
position is maintained on the 1771-ES expander. Of course, if an external
power-supply loss occurs, you must perform a search home operation
after a reset to re-initialize the axis.

Bit 11 Offset

Turn on bit 11 to generate an offset command. When on, this bit
commands the servo positioning assembly to add the offset increment
value in the parameter block to an offset accumulator. The offset
accumulator value is added to each programmed endpoint during move
execution. The command-taken bit in the status block remains on as long

Advertising