
4.DESCRIPTION OF PARAMETERS B-63530EN/03
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1883
Distance 1 from the mark origin of an encoder with absolute addressing
reference marks/encoder with distance-coded reference marks (detection
circuit C) to the reference position
NOTE
When this parameter is set, the power must be
turned off before operation is continued.
[Data type] 2-word axis
[Unit of data] Detection unit
[Valid data range] -99999999 to 99999999
1884
Distance 2 from the mark origin of an encoder with absolute addressing
reference marks/encoder with distance-coded reference marks (detection
circuit C) to the reference position
NOTE
1 When this parameter is set, the power must be
turned off before operation is continued.
2 If a value not within the valid data range is
specified in this parameter when an encoder with
distance-coded reference marks (linear scale/rotary
encoder) (detection circuit C) is used, P/S 5325
may be issued at reference position establishment
time.
[Data type] Word axis
[Unit of data] Detection unit × 100,000,000
[Valid data range] -20 to 20
This parameter is used when the distance from the encoder origin to
the reference position is not within the range set in parameter No.
1883.
In parameter Nos. 1883 and 1884, set the distance from the origin of
an encoder with absolute addressing reference marks (linear
scale/rotary encoder)/encoder with distance-coded reference marks
(linear scale/rotary encoder) (detection circuit C) to the reference
position. The distance from the origin of an encoder to the reference
position can be found by the following expression:
Distance from the origin of an encoder to the reference position
= No.1884 × 100,000,000 + No.1883
The origin of an encoder represents the point where mark 1 and mark
2 match. Usually, this point is a virtual point not physically existing
on the encoder. (See the figure below.)
Set a positive value if the reference position is located in the +
direction when viewed from the encoder point. Set a negative value if
the reference position is located in the - direction when viewed from
the encoder point.