4. REFERENCE POSITION ESTABLISHMENT
B–64113EN–1/01
258
CAUTION
This parameter is unavailable on linear scale with
distance–coded reference marks (serial).
1883
Distance from the zero point of the linear scale with absolute addressing refer-
ence marks (A/B phase) / the linear scale I/F with absolute address referenced
mark (serial) to the reference position
[Data type] 2–word axis
[Unit of data] Detection unit
[Valid data range] –99999999 to 99999999
1884
Distance–2 from the zero point of the linear scale with absolute addressing refer-
ence marks (A/B phase) / the linear scale I/F with absolute address referenced
mark (serial) to the reference position
[Data type] Word axis
[Unit of data] Detection unit
[Valid data range] –20 to 20
When the distance between scale zero and reference position is over the
setting range of parameter 1883, please set this parameter.
CAUTION
On using the linear scale with distance–coded reference
marks (serial), when the value of this parameter is out of
range, P/S alarm 5325 may occur on trying to establish the
reference point.
Set the distance between scale zero and reference position by parameter
No.1883, 1884. The actual distance is determined by following formula:
Actual distance = Parameter 1884 * 100,000,000 + Parameter 1883
The scale zero means a point where reference mark 1 and reference mark
2 are equal. Generally, this is a virtual point that exists on the out of scale
stroke.( Refer to following figure )
When a reference point is located in plus side of a scale zero, set a plus
value to this parameter. And a reference point is located in minus side, set
a minus value.