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5 Motion Control Parameters
5-10
NJ-series CPU Unit Motion Control User’s Manual (W507)
Use the electronic gear to set the relationship between the display unit and pulse unit in the MC Func-
tion Module. Use the Sysmac Studio and set the electronic gear ratio.
Command position value (pulses) = Command position (X units)
×
Electronic gear ratio
*1
For an encoder axis, this is the number of pulses per encoder rotation.
*2
For an encoder axis, this is the travel distance per encoder rotation.
Additional Information
The electronic gear converts units to the values that are used for positioning by the MC Function
Module and motion control instructions. Motion control instructions specify the target position as
LREAL data. However, an instruction error will occur if the command position after conversion to
pulses by the electronic gear exceeds 40 bits.
z
Setting Example
In this example, an OMRON G5-series Servomotor with a 17-bit absolute encoder is used.
The reduction ratio of the reducer is 1/5 and the workpiece moves 10 mm for every rotation of the
ball screw.
The Unit of Display parameter is set to millimeters. The Command Pulse Count Per Motor Rotation
is set to the resolution of the encoder on the Servomotor.
A reducer with a reduction ratio of 1/5 is used, so the ball screw turns 1/5 of a rotation for every Ser-
vomotor rotation. The workpiece moves 2 mm (10 mm
×
1/5), so the Work Travel Distance Per Motor
Rotation is set to 2.
With these settings, the command unit for positions in the user program is 1 mm.
For example, to move to an absolute position of 100.5 mm, the
Position
(Target Position) input vari-
able to the MC_MoveAbsolute (Absolute Positioning) instruction is set to 100.5.
Electronic Gear Ratio (Unit Conversion Formula)
Parameter name
Setting
Unit of Display
mm
Command Pulse Count Per Motor Rotation
131072
Work Travel Distance Per Motor Rotation
2
Servo
Drive
X units
Electronic
gear
Command position
(X units)
MC Function
Module
Y pulses
Actual position
(X units)
Work Travel Distance Per Motor Rotation*2 (X Units)
Command Pulse Count Per Motor Rotation*1 (Y Pulses)
Electronic gear ratio =
Ball screw pitch: 10 mm
Workpiece
Servomotor encoder
resolution: 17 bits/rotation
(131,072 pulses per rotation)
Reduction ratio: 1/5
Summary of Contents for NJ501-1300
Page 12: ...Sections in this Manual 10 NJ series CPU Unit Motion Control User s Manual W507...
Page 18: ...16 NJ series CPU Unit Motion Control User s Manual W507 CONTENTS...
Page 22: ...Read and Understand this Manual 20 NJ series CPU Unit Motion Control User s Manual W507...
Page 34: ...Revision History 32 NJ series CPU Unit Motion Control User s Manual W507...
Page 86: ...3 Configuring Axes and Axes Groups 3 28 NJ series CPU Unit Motion Control User s Manual W507...
Page 122: ...5 Motion Control Parameters 5 24 NJ series CPU Unit Motion Control User s Manual W507...
Page 158: ...6 Motion Control Programming 6 36 NJ series CPU Unit Motion Control User s Manual W507...
Page 166: ...7 Manual Operation 7 8 NJ series CPU Unit Motion Control User s Manual W507...
Page 182: ...8 Homing 8 16 NJ series CPU Unit Motion Control User s Manual W507...
Page 346: ...10 Sample Programming 10 92 NJ series CPU Unit Motion Control User s Manual W507...
Page 422: ...Appendices A 18 NJ series CPU Unit Motion Control User s Manual W507...
Page 423: ...Index 1 NJ series CPU Unit Motion Control User s Manual W507 I Index...
Page 430: ...Index 8 NJ series CPU Unit Motion Control User s Manual W507 Index...