• You can change the setting only for axes that have the Axis Use axis parameter set to Unused axis
(changeable to used axis) or Used axis. Y
ou cannot change the setting of the Axis Use axis pa-
rameter to Used axis if that axis is set to Unused axis (unchangeable to used axis).
• You can execute this instruction when home is defined or when home is not defined. If home is de-
fined and the axis setting is changed to Unused axis, the home definition is lost.
• If you change the setting of an axis that uses an absolute encoder from Used axis to Unused axis,
the absolute encoder home offset (which is saved to the battery-backup memory in the CPU Unit
when the power supply to the Controller is turned OFF) will be the value from just before the axis
was changed to Unused axis.
Precautions for Correct Use
• You cannot change an axis to a used axis if the axis number exceeds the highest axis num-
ber that can be controlled by the CPU Unit. The number of real axes that you can change to
used axes is the maximum number of used real axes.
Item
NY5£2-
£5££ £4££ £3££
Settable axis numbers 0 to 63 0 to 31 0 to 15
Maximum number of used real ax-
es
64 axes 32 axes 16 axes
• Either _MC_AX[*].Status.Disabled (Axis Disabled) or _MC_AX[*].Status.Standstill (Standstill)
in the Axis Variable must be TRUE to execute this instruction. If both of them are FALSE, an
error will occur when you execute the instruction.
• An error will occur if you execute this instruction when _MC_AX[*].Details.VelLimit (Command
Velocity Saturation) in the Axis Variable is TRUE.
• If the Axis Use variable of an axis is set to _mcUnusedAxis (unused axis), you cannot over-
write the axis parameter settings with the MC_Write (Write MC Setting) instruction. Change
the Axis Use variable of the axis to _mcUsedAxis (used axis) before you execute the
MC_Write (Write MC Setting) instruction.
• An error occurs if you execute the MC_GroupEnable (Enable Axes Group) instruction for an
axes group that contains an axis that was changed to Unused axis with this instruction.
• If an error occurs in executing this instruction for a used axis, an axis error will occur. If an
error occurs in executing this instruction for an unused axis, an MC common error will occur.
• After you change axis usage with this instruction, make sure that the Done output variable
from this instruction is TRUE before you execute any other motion control instructions.
Timing Charts
Done
Busy
CommandAborted
Error
ErrorID
Execute
16#0000
MC_ChangeAxisUse Instruction
3 Axis Command Instructions
3-414
NY-series Motion Control Instructions Reference Manual (W561)
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