NSK Megatorque PS Series, Руководство пользователя

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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
NB Proximity limit B
0 0 to 262 144 000 pulse
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