PHOTO
Photoelectric emitter-receiver switch
A photoelectric emitter-receiver device uses an optical path to determine a switching output.
Schematic
IEC · TX
IEC photoelectric emitter interface: normally closed 4 wire
Photoelectric emitter interface form: Normally Closed 4 wire.
In plain English
What does IEC photoelectric emitter interface: normally closed 4 wire mean?
A photoelectric emitter supplies the light used by an optical sensing system; a complete sensing pair also needs a receiver. This entry identifies the normally closed 4 wire form in the publisher's IEC-context family.
A simple example
A conveyor may place the emitter on one side and a separate receiver on the other so an object can interrupt the optical path. The normally-closed designation starts with a conducting output or closed contact in the documented reference condition; operation changes that state. The additional connection points need the actual pin assignment. A fourth or fifth pin may serve an output or control function; pin count alone does not define its purpose.
What the drawings help you do
A supply connection to an emitter is different from a switched detection output. Check the listed terminal and output form rather than assuming every optical device has the same interface.
This particular reference
Photoelectric emitter interface form: Normally Closed 4 wire. This entry adds the normally closed 4 wire detail to the broader photoelectric emitter interface family. A supply connection to an emitter is different from a switched detection output. Check the listed terminal and output form rather than assuming every optical device has the same interface.
- Normally open / normally closed
- The contact state in the normal condition defined for the drawing.
- Terminal
- An identified point where a conductor connects.
- Signal
- Electrical information passed between devices, rather than necessarily the main power supply.
Read the source: Autodesk IEC-60617 Symbol Preview: Photoelectric Emitter Switches
IEC · Normally Closed 4 wire
Autodesk IEC-60617 Symbol Preview: Photoelectric Emitter Switches, HPE12PE4 / VPE12PE4. 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 · TX
What it represents
A photoelectric emitter supplies the light used by an optical sensing system; a complete sensing pair also needs a receiver. This entry identifies the normally closed 4 wire form in the publisher's IEC-context family.
A conveyor may place the emitter on one side and a separate receiver on the other so an object can interrupt the optical path. The normally-closed designation starts with a conducting output or closed contact in the documented reference condition; operation changes that state. The additional connection points need the actual pin assignment. A fourth or fifth pin may serve an output or control function; pin count alone does not define its purpose.
A supply connection to an emitter is different from a switched detection output. Check the listed terminal and output form rather than assuming every optical device has the same interface.
How to read it
- The normally-closed designation starts with a conducting output or closed contact in the documented reference condition; operation changes that state.
- The additional connection points need the actual pin assignment. A fourth or fifth pin may serve an output or control function; pin count alone does not define its purpose.
- A supply connection to an emitter is different from a switched detection output. Check the listed terminal and output form rather than assuming every optical device has the same interface.
Information to show or reference
- Identify the target, sensing mode and expected normal condition.
- Label supply, output and connector pins from the actual device diagram.
- Reference output circuit type, operating range and controller input.
A distinction that matters
This entry adds the normally closed 4 wire detail to the broader photoelectric emitter interface family. A supply connection to an emitter is different from a switched detection output. Check the listed terminal and output form rather than assuming every optical device has the same interface.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
Autodesk IEC-60617 Symbol Preview: Photoelectric Emitter Switches
Public Photoelectric Emitter Switches table explicitly lists HPE12PE4 / VPE12PE4 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.
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