Rockwell Automation 1771-QA Stepper Positioning Assembly User Manual - Manual (Page 123)

5–3 Troubleshooting
Publication 1771-UM002A–EN–P – May 2000
Table 5.B
Operation Troubleshooting
Status Word Bits
Programming
Error, Bit 04 System Fault,
Bit 03
Possible Cause Corrective Action
1 0 Single move control word of one or more
move blocks (except in a truncated or
”zeroed” end portion of a moveset) does not
have bits 17 and 16 = 1 or bits 15-04 = 0. Set or reset bits where required. Check moveset
data for a missing or extra entry causing all other
data to be shifted up or down.
1 0 Bits 14-17 of ramp, decel, MS position and
LS position words of move blocks are not
reset. Reset bits (these bits must always be zero).
1 0 Bits 16-14 of MS preset and bits 17-14 of LS
preset words are not reset. Reset bits (these bits must always be zero).
1 0 Illegal combination of command and/or
control bits See Table 5.C (Illegal Bit Combinations). Generally,
only one command bit should be sent at a time. If
the overset control word is programmed with an
axis number of 0, 4, 5, 6, 7 or with a number for
which there is no expander in the chassis, a
programming error will be returned in the status
word of all axes present.
1 0 Initialization preset and/or software jog
command attempted during a profile Must do either or both before a profile begins.
1 0 During a software jog, a command other
than stop or reset was sent. Send command before or after the software jog.
1 0 Sent offset command with 1-word block
transfer write Block transfer write must be at least four words to
include offset data.
1 0 Sent override command with one or four
word block transfer write. Override command must always be accompanied
by at least a 1-move moveset to be executed as the
override moveset.
1 0 Sent software jog command not
accompanied by jog data following a reset A power-up or software reset clears any previously
loaded jog data in the module. Jog data must then
accompany a jog command or be transferred prior
to initiating a software or hardware jog.
1 1 Position value of a move in the profile is too
small to allow 20msec of final rate. Examine the programmed move data of the next
two moves following the move shown in the status
word, if operating in the continuous mode or
independent mode.
Final rate value of a move in the profile is
too high to allow 20msec of final rate. If in the single step mode, examine the present
move which was not executed or not executed
properly. Use equations if necessary to find invalid
data. Refer to section titled “Application
Considerations” in chapter 3.
Ramp value or decel value (if normally
executed) of a move in the profile is too
large to allow 20msec of final rate.
1 1 Change of direction attempted when not at
0Hz In the continuous mode, program a 0Hz rate move
preceding the move that reverses direction. The
0Hz rate move is not needed or allowed in the
independent or single step mode.