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3. Setup
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3-4-2 Restrictions on absolute position control
When executing absolute position control, the following conditions must be satisfied. If not satisfied,
mechanical specifications and electrical specifications (such as resolution of the detector) must be
revised.
When executing incremental control, there are no particular restrictions on servo control. (Confirm with
the NC system side specifications.)
(1) For linear axis
The following conditions, Condition 1 and 2, must be satisfied simultaneously.
(Condition 1)
2147
Length of stroke ≤
IUNIT
[m]
IUNIT = 2/NC command unit (µm)
1µm : IUNIT = 2， 0.1µm : IUNIT = 20
(Condition 2)
(a) For semi-closed loop control
PC1 x PIT
Length of stroke ≤ 2147 x
PC2 x RNG2
[m]
(b) For full-closed loop control
PIT
Length of stroke ≤ 2147 x
RNG1
[m]
(Note) Even during the full-closed loop control, when the MP scale is used, restrictions are
applied with the condition (a), as well.
(2) For rotary axis
The following conditions must be satisfied.
2147000
PC2 ≤
RNG2
x PC1