Rockwell Automation 1771-QA Stepper Positioning Assembly User Manual - Manual (Page 46)

3–24 Programming and Operation
Publication 1771-UM002A–EN–P – May 2000
Bits 10-13 Move in Progress Bits.
The bit pattern in Hex shows which move (1-10) of the moveset is
currently being executed. (decimal 10=Hex A).
Bit 14 Jog Reverse Bit.
This bit is set when a software jog reverse command has been
received or when a hardware jog reverse input is asserted.
Bit 15 Jog Forward Bit.
This bit is set when a software jog forward command has been
received or when a hardware jog forward input is asserted.
Important: If the jog final position value is reached (upper or lower
limit) during a software jog, the status bit 14 or 15 will
be reset even if the software jog command remains
asserted. However if a hardware jog is being executed,
the status bit 14 or 15 will remain set until the hardware
jog input is removed.
Bit 16 Moveset Bit.
This bit indicates the number (0 or 1) of the current moveset being
executed. The moveset bit will alternately toggle to 1 or 0 when
multiple movesets are executed.
Bit 17 Done Bit.
This bit will be set after every move in the single-step mode or
independent mode; or after a move profile is completed in the
continuous mode. It is reset when the first move of the next moveset
begins. Refer to independent mode in section “Positioning Modes”
concerning the use of this bit in the independent mode.
Position Words
Position words report the number of pulses that have been sent to the
stepper translator (provided that the position register in the stepper
controller module has not been changed by a preset). The PC
processor can then continually monitor the number of output pulses
which in turn indicates the present position of the machine.
Two position words are required to store the number of position
pulses, one to store the three most significant digits and the other to
store the three least significant digits. The position pulses which can
range from 0 to 999,999 are stored in BCD in the lower 12 bits of
each word (Figure 3.14).