Rockwell Automation 1771-QA Stepper Positioning Assembly User Manual - Manual (Page 33)

3–11 Programming and Operation
Publication 1771-UM002A–EN–P – May 2000
When the decel/instantaneous bit is zero, output pulses will cease
instantly when a software stop command is received.
A hardware stop input in instantaneous, independent of the
decal/instantaneous bit.
This bit is generally set when a stop bit is set.
Bits 10, 11 Axis Address Bits.
These bits define the axis to be controlled by the data and/or
commands in the moveset block. The address in the moveset control
word of the moveset block must be identical to the settings of the
address switch assembly (S3) of the corresponding pulse output
expander module. The address bits of the moveset block are
generally set when the profile is initially programmed using the
industrial terminal. The setting of bits 11 and 10 respectively are 01
= axis 1, 10 = axis 2, 11 = axis 3.
Bit 12 Must always be zero.
Bit 13 Offset Command Bit.
When set, the value contained in the offset word (described below)
will be added to or subtracted from the final position value(s) of all
moves of the moveset blocks residing in the stepper controller
module memory. In all modes, the final position of each move is
shifted by the offset amount and direction.
Bit 17 of the offset word determines the direction of the shift, 1 for
subtracted or 0 for added.
Important: The present move being executed and the move
following may not be affected by the offset command in
all but the single step mode. In the single step mode,
only the present move will not be affected.
The user program should clear the offset bit and allow the stepper
controller module to see the bit cleared before another offset for that
axis is enabled.
Bit 14 Software Jog Reverse Command Bit.
The axis will move in the direction indicated for as long as this bit is
set or until the final position programmed in the jog move is reached.
Hardware jog inputs are disabled during this time. The jog will
follow the ramp, rate, decel and final position values programmed in
the jog move block.
In large systems or systems using remote I/O, the software jog
timing will depend on block transfer timing. Refer to section titled
“Handshaking.”