NSD Varlimit VS-212DN User Manual

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1.1 Features
The VS-212DN has the following features:
(1) Absolute position detection:
Rotational position is detected by an absolute position detection format. Even when a power outage,
etc., occurs, the correct address of the ABSOCODER sensor's current position will be instantly detected
when power is turned back ON.
(2) High resolution:
The 32-turn rotary-type ABSOCODER sensor (MRE Series) offers a resolution factor of 4096 divisions
per 1 turn of the sensor shaft. The resolution factor for a 64-turn rotary-type ABSOCODER sensor is
half the amount given above. Refer to Item 2.6 ABSOCODER sensor for details regarding the relationship
between the number of turns and the resolution. Such high resolution results in high-precision ON/OFF
signal outputs and positioning.
(3) High-speed response:
The VS-212DN ON/OFF signal and motor control outputs are not affected by the PLC's scan time.
These output signals are executed within 4ms after position detection occurs.
(4) Current position preset function:
If a positional discrepancy occurs between the machine's position and the ABSOCODER sensor's
position, the current position can be preset to the desired value by external input. The current position
can also be preset from the PLC via the buffer memory.
(5) Current position hold function:
By detecting the leading edge (OFF→ON) of the current position preset input (external connector), the
current position is stored in the buffer memory and held.
(6) Speed detection function:
The sensor's rotation speed is constantly monitored. The detected value (change in position per
specified time) is stored in the buffer memory for data communication with the PLC CPU as sensor
binary or as r/min..
(7) Unidirectional positioning format:
Regardless of the existing positional relationship between the current position and the target stop
position, positioning is always executed from the same direction. If the target stop position lies in the
opposite direction, position overshooting will occur, with positioning the being executed from the
prescribed direction. Unidirectional positioning reduces error resulting from backlash, etc.
(8) Joint use of positioning function and limit switch output function:
Output of the designated limit switch output signals is possible while positioning is being executed
toward the target stop position.
(9) Two speed control formats:
Either of two speed control formats can be used for the positioning operation:
o Speed switching format in which low-speed/high-speed signal switching occurs.
o Speed stepping format in which a series of low-speed/medium-speed/high-speed changes occur.
(10) Extension of positioning pattern data:
The desired item of positioning pattern data; medium-speed zone, low-speed zone, stop zone, or
In-position zone can be changed via the buffer memory. The stop zone data can be changed separately
for forward direction and reverse direction.
(11) Positioning command speed limit function:
Some limitation can be applied to speed command output for positioning via the buffer memory.
(12) Highly accurate positioning by simple learning function:
If a positional discrepancy occurs between the target position and the current position upon completion
of positioning, the discrepancy will be automatically corrected when positioning is next carried out.

NSD Varlimit VS-212DN Specifications

General

Brand	NSD
Model	Varlimit VS-212DN
Category	Controller
Language	English