
B-63944EN/02 APPENDIX A.PARAMETERS
- 1393 -
1884 Distance 2 from the scale zero point to reference position
NOTE
When this parameter is set, the power must be
turned off before operation is continued.
[Input type] Parameter input
[Data type] 2-word axis
[Unit of data] Detection unit
[Valid data range] -999 to 999
Use this parameter when the distance from the scale zero point to the
reference position exceeds the setting range specified in parameter No.
1883.
Parameter No. 1883 and No. 1884 are used to set the distance from the
scale zero point to the reference position on a linear scale with
absolute address reference marks or a linear scale with an absolute
address zero point.
Distance from the zero point to the reference position of a linear
scale
= No. 1884 × 1,000,000,000 + No. 1883
The scale zero point represents a point where mark 1 and mark 2
match. Usually, this point is a virtual point that does not physically
exist on the scale. (See the figure below.)
If the reference position is placed in the + direction when viewed from
the scale zero point, set a positive value. If the reference position is
placed in the - direction when viewed from the scale zero point, set a
negative value.
Mark 1 Mark 2 Mark 1 Mark 2
Zero point of encoder
Encoder end
Reference position
……..
Mark 1 = mark 2
41.8
8.242.0
8.0
PRM.1821
PRM.1882
PRM.1884
100,000,000 + PRM.1883