4.3.3. Limit switches
Limit switches designation
Limit switches are designed in order either to prevent the stage movement out of permissible physical movement range or to limit its
movement range according to user-defined requirements. Incorrect setting of the limit switches may result to stage jam if the
controller goes beyond the permissible range.
General settings
If the limit switch is active, a corresponding flag is placed in the state structure and the appropriate icon (left or right) is displayed in
. The controller can either stop any movement in the direction of any active limit switch (left or right) or stop the
movement to the single limit witch (left or right) or not to limit the movement. Limit switches settings are performed in XILab software
(see the
Motion range and limit switches
section).
Programmable motion range limitation
If there are no hardware limit switches for the motion range but the stage requires such limitation, the programmable limiters can be
used. For doing that, the limiters should be switched to limitation mode according to position reading (see the
the left limit switch is active if the actual position is less than the left margin value and the right one is active if the actual position is
greater than the right margin value. The operation time is about one millisecond.
Warning. The programmable motion range limitation is reliable only if there is no direct setting of the new position
by ZERO or SPOS commands, or if there is no steps loss or encoder malfunction if it is used for positioning, or if there
is no frequent power-cut during the rotation. If any of these problems appears, the programmable range should be re-
adjusted. The appropriate reference sensor allows the automatic re-adjustment using the
Hardware limit switches
The controller may operate with limit switches based either on dry contacts, or on optocouplers, or on reed switches, or on any other
sensor types generating a 5V TTL-standard "logic one" electric signal in one state and a "logic zero" in the other. Each limit witch may
be configured independently. There is also possible to change the position of limit switches or their polarity in software.
Note. Limit switches are also useful for
automatic Zero position calibration
.
Limit switches connecting instructions
Limit switches should be connected to
pins as it is shown at the diagrams:
The "optocoupler" limit switches connection diagram.
The "dry contact" limit switches connection diagram.
Limit switches location on translators
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Summary of Contents for 8SMC5-USB
Page 30: ...Linux Page 30 345 Page 30 345 ...
Page 83: ...Connection of magnetic brake to one axis or two axis systems Page 83 345 Page 83 345 ...
Page 87: ...Scheme of buttons connection to the HDB 26 connector Page 87 345 Page 87 345 ...
Page 99: ...Page 99 345 Page 99 345 ...
Page 167: ...Vertical load capacity the maximum vertical load on the stage Page 167 345 Page 167 345 ...
Page 186: ...Click Next Click Continue anyway Page 186 345 Page 186 345 ...
Page 188: ...Page 188 345 Page 188 345 ...
Page 190: ...Page 190 345 Page 190 345 ...
Page 193: ...Page 193 345 Page 193 345 ...
Page 201: ...Select the XILab application in the Programs block Start it Page 201 345 Page 201 345 ...
Page 274: ...7 Files 1 Configuration files 2 Software Page 274 345 Page 274 345 ...
Page 331: ...Motorized Iris Diaphragms 8MID98 Motorized Iris Diaphragm Page 331 345 Page 331 345 ...
Page 338: ...8 Related products 1 Ethernet adapter Page 338 345 Page 338 345 ...
Page 339: ...8 1 Control via Ethernet 1 Overview 2 Administration Page 339 345 Page 339 345 ...