
B-63323EN-1/03 4.REFERENCE POSITION ESTABLISHMENT
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5227 Distance between the origin of the linear scale having reference marks and
the reference position
%
0" "
@ ""% #GGGGGGGGG#GGGGGGGGG
Specifies the distance between the origin of the distance coded linear scale and the
reference position. The "scale origin" here is that point where mark 1 coincides
with mark 2. Usually, this point does not physical exist on the scale.
If the reference position is on the positive side when viewed from the scale zero
point, a positive value is set in this parameter. If the reference position is on the
negative side when viewed from the scale zero point, a negative value is set in this
parameter.
Scale
Scale zero point
Mark 1 = mark
Mark 2Mark 1 Mark 2Mark 1
Reference position
Scale end
8.0 42.0 8.2 41.8
Parameter No. 1896
Parameter No. 5226
Parameter No. 5227
[Example] In case of the scale shown in following figure for a millimeter machine
with IS-B.
Scale zero point
Reference position
Mark1=Mark2
Mark1
AB
20.000 19.980
9.960
10.040 9.980 10.020
9960/(20020-20000) * 20000+5000 = 9965000
5.000
20.020
20.000
0.020
10.060
+
Mark2 Mark1 Mark1 Mark2 Mark1 Mark2 Mark1 Mark2 Mark1
Parameter No.1896 (interval of the mark1) = 20000
Parameter No.5226 (interval of the mark2) = 20020