IAI America PCON-CY - Manual (Page 62)

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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
± (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.