Rockwell Automation 1771-QB Linear Pos. - Manual (Page 115)

Formatting Module Data (WRITES)
Chapter 7
7Ć36
On = high jog rate
If this bit changes state during a jog operation, the axis will accelerate or
decelerate to the newly commanded rate at the global acceleration/deceleration
rate programmed in the parameter block.
Bits 5 and 6 – Forward Jog and Reverse Jog
Turning on bit 5 causes axis motion in the forward direction. Similarly, turning
on bit 6 causes axis motion in the reverse direction. In addition:
the jog bits are valid only if the loop is in manual mode. They are ignored if
it is in auto mode.
the axis motion continues until you turn the jog bit off or until the actuator
approaches the software travel limit (whichever occurs first).
if the axis approaches the software travel limit and the jog bit is still on, axis
motion will stop at the global deceleration rate.
the axis speed is either the low jog rate or the high jog rate, as defined in the
parameter block. You select the rate by the jog rate select bit (bit 4).
the discrete jog inputs take priority over the corresponding jog bits.
You may switch jog directions while the axis is jogging. If, while the axis is
jogging in the forward direction, you turn forward jog off and reverse jog on,
the axis decelerates to zero and then jogs in the reverse direction.
Bit 7 – Slide Stop
Setting the slide stop bit causes the axis to decelerate to a stop at the
programmed deceleration rate (local or global) for the current axis motion.
After completion of a slide stop, the done bit in the status block turns on. The
in-position bit also turns on when the axis enters the in-position band defined in
parameter block. You can then initiate motion using jog commands, or by
commanding setpoints or motion segments. The following rules apply:
the module recognizes slide stop commands in either auto or manual mode
slide stop commands have higher priority than setpoint or jog commands
slide stop commands do not result in a loop fault
If the stop/start enhancement bit in the parameter block control word is set, then
the axis will remain stationary while the slide stop bit is set. However, if the
stop/start enhancement bit is cleared, the module will attempt to respond to new
setpoint commands even though the slide stop bit is set.