LS NO
Normally-open limit switch
A normally-open limit switch closes when the documented mechanical travel or position condition actuates it.
Schematic
IEC · LS
IEC mechanical position-switch contact: limit switch normally open - events driven
Mechanical position-switch contact form: Limit Switch Normally Open - Events Driven.
In plain English
What does IEC mechanical position-switch contact: limit switch normally open - events driven mean?
A mechanically operated position switch changes its contact state when travel, a cam or a lever reaches the documented operating condition. The operating mechanism mark explains how movement reaches the switch; the electrical contact still has to be read in its stated unoperated position. This entry identifies the limit switch normally open - events driven form in the publisher's IEC-context family.
A simple example
A moving carriage may operate the switch near the end of travel, or an operator may move a multidirectional lever. Identify the actual direction or target position on the drawing and connect the switch tag to the corresponding mechanical detail. The normally-open designation starts with a non-conducting output or open contact in the documented reference condition; operation changes that state. The event-driven operating mechanism additional drawing mark identifies operation by a documented count or event condition, rather than an ordinary travel roller. Reference the actual mechanism and its reset rule.
What the drawings help you do
Detents retain an operating position and are different from a spring-return mechanism. The schematic does not supply operating travel, overtravel, contact force or a safety performance level; use the selected switch data for those properties.
This particular reference
Mechanical position-switch contact form: Limit Switch Normally Open - Events Driven. This entry adds the limit switch normally open - events driven detail to the broader mechanical position-switch contact family. Detents retain an operating position and are different from a spring-return mechanism. The schematic does not supply operating travel, overtravel, contact force or a safety performance level; use the selected switch data for those properties.
- Normally open / normally closed
- The contact state in the normal condition defined for the drawing.
- Signal
- Electrical information passed between devices, rather than necessarily the main power supply.
- Rating
- A value stating the conditions for which equipment is specified.
Read the source: AutoCAD Electrical: Limit switches
IEC · Limit Switch Normally Open - Events Driven
Autodesk IEC-60617 Symbol Preview: Limit Switches, HLS11S16 / VLS11S16. This identifies the publisher's library context; exact IEC graphics and database identities are not asserted.
Shown as an independently authored educational illustration. Use the cited publication and drawing legend to verify the required drafting form.
Schematic · LS
What it represents
A mechanically operated position switch changes its contact state when travel, a cam or a lever reaches the documented operating condition. The actuator mark explains how movement reaches the switch; the electrical contact still has to be read in its stated unoperated position. This entry identifies the limit switch normally open - events driven form in the publisher's IEC-context family.
A moving carriage may operate the switch near the end of travel, or an operator may move a multidirectional lever. Identify the actual direction or target position on the drawing and connect the switch tag to the corresponding mechanical detail. The normally-open designation starts with a non-conducting output or open contact in the documented reference condition; operation changes that state. The event-driven actuator qualifier identifies operation by a documented count or event condition, rather than an ordinary travel roller. Reference the actual mechanism and its reset rule.
Detents retain an operating position and are different from a spring-return mechanism. The schematic does not supply operating travel, overtravel, contact force or a safety performance level; use the selected switch data for those properties.
How to read it
- The normally-open designation starts with a non-conducting output or open contact in the documented reference condition; operation changes that state.
- The event-driven actuator qualifier identifies operation by a documented count or event condition, rather than an ordinary travel roller. Reference the actual mechanism and its reset rule.
- Detents retain an operating position and are different from a spring-return mechanism. The schematic does not supply operating travel, overtravel, contact force or a safety performance level; use the selected switch data for those properties.
Information to show or reference
- Name the position, movement or event that operates the switch.
- Show whether the mechanism returns or remains in a detent.
- Match terminals and contact state to the mechanical operating detail.
A distinction that matters
This entry adds the limit switch normally open - events driven detail to the broader mechanical position-switch contact family. Detents retain an operating position and are different from a spring-return mechanism. The schematic does not supply operating travel, overtravel, contact force or a safety performance level; use the selected switch data for those properties.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
AutoCAD Electrical: Limit switches
Public Limit Switches table explicitly lists HLS11S16 / VLS11S16 with this operating or connection form. Vendor graphics are linked, not copied.
About this graphic
This illustration was authored independently by Elora Grid to explain the concept. It is not reproduced from a customer drawing, an official standard graphic or a manufacturer CAD file. Its correspondence to an exact IEC or IEEE symbol identifier has not been certified.
SVG and DXF downloads contain this original artwork. DXF uses unscaled drawing units; a GA envelope supplies no product dimensions, clearances or fabrication information. Original artwork is available under CC BY 4.0. Third-party references retain their own terms.
Explore related references
Put the reference into a drawing workflow.
Elora Grid helps electrical teams work with drawings, specifications and equipment information. Explore the drafting workflow or join the early-access waitlist.