1.2 Definitions
(1) ABSOCODER
ABSOCODER is the generic name given to the NSD-developed position sensor which detects
rotational/linear displacement, speed, and acceleration, using an absolute position detection format
with a digital (or analog) output.
The ABSOCODER sensor consists of two main components:
The sensor, where displacement is detected by the change in magnetic resistance, and the converter,
where the sensor’s output signal (when an AC excitation signal has been applied to the sensor) is
converted into absolute date.
The converter for Multi-turn type ABSOCODER sensor is built-in to the VS-212DN.
(2) UNIDIRECTIONAL POSITIONING
Positioning toward the target stop position is always executed from a single direction. When
positioning is required in the opposite direction, the target stop position will be overshot, and
positioning will then occur from the prescribed direction (U-turn is made). The unidirectional positioning
format is useful in reducing stop position errors caused by backlash, etc.
(3) IN-POSITION ZONE
During the positioning operation, there may be a slight discrepancy between the point where
positioning ends and the target stop position. At such times, a judgement is required to determine
whether the discrepancy is within a permissible limit. The 'In-position zone' setting is a +/- value to
determine 'in position'. If the positional discrepancy in within the In-position zone, the 'In-Position'
signal output will occur.
(4) OVERSHOOT AMOUNT
This refers to the amount by which the target stop position is overshot before a U-turn is made during
unidirectional positioning.
(5) PROTECTED CHANNEL (LIMIT SWITCH OUTPUT FUNCTION)
This refers to a switch output channel where the switch output ON/OFF setting cannot be changed
during the course of normal operations.
In order to make setting changes at such a channel, its protected status must be cancelled by
designating the 'number of protected channels' setting as '0' in the [PRM] (parameter) mode.
(6) SENSOR SHAFT ROTATION DIRECTION
Depending on the direction in which the ABSOCODER sensor shaft rotates, the position data value will
increase or decrease. For the VS-212DN, two position data areas are available, one for detecting in
the CW direction, and one for detecting in the CCW direction.
For multi-turn type ABSOCODER sensor (MRE series), the following will apply:
o Current position value in the CW direction:
Position data value will increase when the sensor
shaft rotates CW (viewed from shaft direction).
o Current position value in the CCW direction:
Position data value will increase when the sensor
shaft rotates CCW (viewed from shaft direction).
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