Omron NX701-1 User Manual page 263

Precautions for Correct Use Precautions for Correct Use
Observe the following precautions on the operation direction of the previous operation.
• If the MC_Home or MC_HomeWithParameter instruction exceeds the point where the home
input was detected and reverses operation, the opposite direction of the home input detection
direction is used.
• If a homing compensation value is set for the MC_Home or MC_HomeWithParameter instruc-
tion, the axis will move in the direction of the compensation value.
• If an immediate stop is specified for the MC_TouchProbe (Enable External Latch) instruction,
the latch position may be exceeded and the direction may be reversed.
• The direction may be reversed for the MC_MoveFeed (Interrupt Feeding) instruction.
• When the MC_ResetFollowingError instruction is executed, the error is set to zero, so the
command direction is used.
• If an immediate stop is specified for an external input signal or resetting the error counter is
specified for stopping for a limit input, the operation may reverse direction toward the position
where the external input signal was received.
Example for No Direction Specification
The following example illustrates when positioning is performed towards a target position of −20 when
the command current position is 50.
Modulo maximum
position setting
value: 100
0
Modulo minimum
position setting
value: −70
Similarly, the following example illustrates when the ring counter upper limit is 100, the lower limit is
−70, the command current position is −20, and positioning is performed towards a target position of
290.
Modulo maximum
position setting
value: 100
0
Modulo minimum
position setting
value: −70
NJ/NX-series CPU Unit Motion Control User's Manual (W507)
Command current position:
50
Target position:
−20
Moves towards the
ring counter range.
Command current
position: −20
Performs relative positioning with target distance of (290
(target position) − 100 (upper limit)) = 190.
9 Motion Control Functions
Target position:
−20
190
9
Position after
positioning: −50
9-41