IAI America ACON-CY - Manual (Page 64)

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5. Operation Using I/O Signals
z Meaning of Position Detection Output Signals (LS0, LS1, LS2)
These signals are handled in the same way as limit switches (LSs). They turn ON when the following
conditions are met:
[1] The homing complete output signal (HEND) is ON.
[2] The current position is within the allowable distance before or after each target position (inside the
positioning band).
Accordingly, each output signal also turns ON when the actuator is manually moved while the servo is off, in
addition to when the actuator is moving following the applicable move command.
If an emergency stop is actuated while the actuator is moving and operation must be resumed from the PLC
when none of the position detection output signals (LS0, LS1, LS2) is ON, move the actuator manually to the
target position to turn on the corresponding position detection output signal.
Caution: All position detection outputs will turn OFF once a phase A/B open detection alarm generates.
z Notes on Setting the Positioning Band
The positioning band setting defines the range of coordinates at which the position detection output signal will
turn ON.
Condition for a position detection output signal to turn ON = Target position
r (positioning band)
With a normal move command, once the position detection output signal turns ON, the sequence processing
will be performed and the move command input signal will turn OFF.
Take note that if the positioning band is wide and the move command input signal turns OFF too quickly, the
target position may not be achieved.
(Example) If the feed speed is 300 mm/s and deceleration is 0.3 G, the deceleration distance is approx. 15
mm. If the positioning band is set to 30 mm, the position detection output signal will turn ON before
the actuator starts decelerating. If the PLC turns OFF the move command input signal immediately
thereafter, the controller will start the deceleration stop processing. As a result, the actuator will
stop before the target position.
Front end move
command input (ST1)
Front end detection
output (LS1) Correct starting point
of deceleration
Front end
The actuator stops before
the front end.
Positioning band
The positioning band is greater
than the deceleration distance.