IAI America ERC3 - Manual (Page 251)

Chapter 4 Operation
4.2 Operation in Positioner Mode 4.2.3 Operation in Positioner Mode 2 (Operation Using PIO Converter)
241
(Example) Repetition of ST1 o ST2 o ST1 o
Insert timer 't if necessary.
Ǎ t : Time required to certainly reach the target position after the position sensing output LS1 or 2 is turned ON.
[Example of stop position when the ST* signal is turned OFF by the LS* signal]
If the positioning width is set at a position before the original deceleration start position, the
actuator cannot reach the target position.
Caution: (1) If the ST* signal for the position is turned ON after the completion of
positioning, the LS* signal remains ON.
(2) The LS* signal is set to ON in the positioning width zone. Accordingly, they
may be turned ON under operation of the actuator if a large positioning width
is set.
(3) Interlock should be taken so that two or more ST* signals are set to ON
simultaneously. If two or more ST* signals are input simultaneously, they will
be executed according to the following priorities: ST0oST1oST2.
(4) LS* signal would not be output if the positioning width is set less than the
minimum resolution.
Start signal
ST1
(PLCoController)
Turned ON after
entering into
positioning width zone
Target Position
Position sensing output
LS1
(ControlleroPLC)
Start signal
ST2
(PLCoController)
Position sensing output
LS2
(ControlleroPLC)
Ǎ t
Ǎ t Ǎ t
Start signal
ST1
(PLCoController)
Turned ON after
entering into
positioning width zone
Target
position
Position sensing output
LS1
(ControlleroPLC)
Operation of actuator
Stop before target position
Orignal deceleration
start position
Positioning
width
Deceleration
start
Velocity
Move
distance