5.2 Absolute Encoders
5.2.6 Position Management Method for Each Machine Operation Type
5-32
Infinite-length Operation Position Management Methods
There are two methods for infinite-length operation position management: a position manage-
ment method that does not require ladder programming (simple absolute infinite axis position
management) and a method that manages the position with ladder programming (non-simple
absolute infinite axis position management).
To perform simple absolute infinite axis position management, set fixed parameters No. 36, 38,
10, 6, 8, and 9 so they satisfy the following conditions.
Condition 1:
The reset number of rotations depends on whether the pulse, or whether the mm, degree, inch,
or μm is selected for the reference unit.
• When the Reference Unit Is Pulse
• When the Reference Unit Is mm, degree, inch, or μm
Condition 2:
If the above conditions cannot be satisfied, non-simple absolute infinite axis position manage-
ment must be used to manage the position with ladder programming.
Infinite-length Operation with Simple Absolute Infinite Axis
Position Management
Infinite-length operation is operation where movement is performed in one direction, such as is
required for a conveyor belt. This section describes parameter settings required with infinite-
length operation using simple absolute infinite axis position management, precautions for
parameter settings, setting the origin, and precautions for when the power supply is turned ON
and OFF.
Parameter Settings
This section describes the parameter settings required for each axis when performing infinite-
length operation using simple absolute infinite axis position management.
Fixed Parameter Settings Required for Infinite Axis Position Management
To perform simple absolute infinite axis position management using the axis as an infinite-
length axis, set fixed parameter No. 1 bit 0 (Axis Selection) to 1 (Infinite-length axis) and fixed
parameter No. 1 bit 9 (Simple Absolute Infinite Axis Position Management) to 1 (Enabled).
Condition 2 is only applicable for MP3200 CPU201 Version 1.07 or earlier.
No. Bit Name Setting (Meaning) Reference
1
0 Axis Selection
1: Infinite-length
axis
Function Selection Flags 1 on
page 3-28
9
Simple Absolute Infinite Axis Posi-
tion Management
1: Enabled
(No. 38: Maximum Number of Absolute Encoder Rotations + 1) / Reset rotations = Inte-
ger (Remainder = 0)
Reset number of rotations = No. 10: Infinite-length Axis Reset Position (POSMAX) /
No. 36: Numbers of Pulses Per Motor Rotation
Reset number of rotations = No. 10: Infinite-length Axis Reset Position (POSMAX) ×
No. 8: Servomotor Gear Ratio / (No. 6: Travel Distance per Machine Rotation (Rotary
Motor) × No. 9: Machine Gear Ratio)
No. 36: Number of Pulses per Motor Rotation (Rotary Motor) × (No. 38: Maximum
Number of Absolute Encoder Rotations + 1) < 231 (= 2,147,483,648)
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