Yaskawa MP2000 Series I/O Module User Manual - Manual (Page 59)

2.5 Electronic Gear Function
2.5.1 Outline
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LIO-01/LIO-02 Module
2.5 Electronic Gear Function
The Electronic Gear Function can be used when other than pulse is set to the counter fixed parameter No. 08 (Refer-
ence Unit Selection).
2.5.1 Outline
The Electronic Gear Function is used to set the workpiece travel distance per pulse input to the LIO Module counter to
any value.
The following example describes differences in operations to move a workpiece 10 mm using the equipment shown
below with and without electronic gear function. When using the electronic gear function, simply input the reference
value calculated for the travel distance regardless of the number of pulses to move a workpiece for a specified travel
distance.
2.5.2 Settings
Use steps 1 to 5 in the following procedure to make the settings.
1. Confirm the machine specifications.
2.
Check the number of encoder pulses displayed in Counter Value, and set this value to the counter
fixed parameter No. 14 (Encoder Resolution (Pre Quadrature)) (Number of Pulses Per Encoder Rota-
tion).
3.
Set the reference unit (the smallest reference unit for the reference data to move a load) according to
the settings in the counter fixed parameters No. 08 (Reference Unit Selection) and No. 09 (Number of
Digits Below Decimal Point).
When the Electronic Gear is Not Used
To move a workpiece 10 mm:
1 revolution is 6 mm. Therefore,
10
÷ 6 = 1.666 revolutions
2048 × 4 pulses is 1 revolution. Therefore,
1.666 × 8092 = 13653 pulses
13653 pulses are input as reference pulses. The equation
must be calculated at the host controller.
When the Electronic Gear is Used
To move a workpiece 10 mm:
Mechanical conditions and minimum reference unit are
defined with electronic gear.
To move a workpiece 10 mm, the minimum reference unit
is set to 1
μm. Therefore,
10 (mm) ÷ 1 (μm) = 10000
10000 is input as reference value.
Ball screw pitch: 6 mm
Workpiece
No. of encoder pulses:
8192
Elements relating to the Electronic Gear
• Gear ratio
• Ball screw pitch
• Pulley diameter, etc.
Ball screw pitch
Gear ratio
Reference unit: 0.001 mm
Consider the machine specifications and
positioning precision when setting the
reference unit.
Reference to move a table in
units of 0.001 mm.