NSK EDD Megatorque Motor - Target Proximity: NEARA and NEARB

7. Operational Function
— 7-20 —
7.2.7. Target Proximity: NEARA and NEARB
 These outputs report that the Motor is approaching to the target position.
 These outputs are used to have a precise timing with external devices just before the positioning
completes.
Table 7-25: Signal logic of outputs NEAR and NEARB
Logic
Description
Open
Not in the proximity of the target position.
Closed
In the proximity of the target position.
 These outputs report the current Motor position is approaching to the target position when executing a
positioning by the programs or by RS-232C communication.
 The output closes when the Motor gets in the proximity of the target position set by the parameter NA
(Near A) in units of pulse.
 The output remains closed when the Motor is in the proximity area at the time of inputting a positioning
command.
Table 7-26: Parameter related to outputs NEARA and NEARB
Name (code)
Function
Initial
setting
Data range
Unit
NA
Proximity limit A
0
0 to 262 144 000
pulse
NB
Proximity limit B
 When the output is closed once the Motor has been in proximity area, the output remains closed until the
next positioning command is executed. (The Condition of output signal is ensured to be stable until the
next positioning operation is completed.)
However, it opens again in the following situations since the Driver Unit cannot hold the current target
position.
 Interruption of a positioning by the input STP (Stop).
 Deactivation of Motor servo
 Interruption of a positioning by an alarm, a warning and an activation of the travel limit.
Fig 7-18: Signal timing of outputs NEARA and NEARB
Motor motion
MV
MB
The Motor starts rotating at the rising edge.
Max. 1 ms.
RUN input
ON
OFF
closed
open
Output NEARA
MA
Target position
Setting of parameter NA
Max. 1 ms
Motor position scale