# IEC combined photoelectric sensor: normally closed emitter-receiver - DC driven Canonical URL: https://eloragrid.ai/symbols/iec-combined-photoelectric-sensor-normally-closed-emitter-receiver-dc-driven Publisher: Elora Grid Updated: 2026-10-28 Lookup label: TX Drawing use: Schematic Reference families: IEC, Manufacturer ## Symbol convention Convention: IEC Form: Normally Closed Emitter-Receiver - DC Driven Autodesk IEC-60617 Symbol Preview: Photoelectric Emitter/Receiver Switches, HPE12B16 / VPE12B16. This identifies the publisher's library context; exact IEC graphics and database identities are not asserted. Combined photoelectric sensor form: Normally Closed Emitter-Receiver - DC Driven. ## In plain English ### What does IEC combined photoelectric sensor: normally closed emitter-receiver - DC driven mean? A combined photoelectric sensor contains an emitter and a receiver within the same documented sensing unit. This entry identifies the normally closed emitter-receiver - dc driven form in the publisher's IEC-context family. ### A simple example A reflective sensing arrangement can detect a passing object or a change in returned light and send the result to a control input. The normally-closed designation starts with a conducting output or closed contact in the documented reference condition; operation changes that state. This is the DC-supplied form. Preserve supply polarity and confirm the output circuit type from the device wiring diagram. ### What the drawings help you do The combined housing does not establish whether a reflector or the target returns the light. Sensing mode, light-on or dark-on selection and pin functions need the selected product diagram. ### This particular reference Combined photoelectric sensor form: Normally Closed Emitter-Receiver - DC Driven. This entry adds the normally closed emitter-receiver - dc driven detail to the broader combined photoelectric sensor family. The combined housing does not establish whether a reflector or the target returns the light. Sensing mode, light-on or dark-on selection and pin functions need the selected product diagram. ### Terms - DC: Direct current: electricity flowing in one direction. - 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. Concept diagram: Identify the device and form → Read the connections and state → Check the equipment reference A guide to reading this reference. The original symbol illustration and its drawing notes appear below; these boxes are not a wiring diagram. - [AutoCAD Electrical: Photoelectric emitter/receiver switches](https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-15ABE47A-723F-4004-BF2A-9CC285DE7882.htm) ## What it represents A combined photoelectric sensor contains an emitter and a receiver within the same documented sensing unit. This entry identifies the normally closed emitter-receiver - dc driven form in the publisher's IEC-context family. A reflective sensing arrangement can detect a passing object or a change in returned light and send the result to a control input. The normally-closed designation starts with a conducting output or closed contact in the documented reference condition; operation changes that state. This is the DC-supplied form. Preserve supply polarity and confirm the output circuit type from the device wiring diagram. The combined housing does not establish whether a reflector or the target returns the light. Sensing mode, light-on or dark-on selection and pin functions need the selected product diagram. ## 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. - This is the DC-supplied form. Preserve supply polarity and confirm the output circuit type from the device wiring diagram. - The combined housing does not establish whether a reflector or the target returns the light. Sensing mode, light-on or dark-on selection and pin functions need the selected product diagram. ## 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. ## Important distinction This entry adds the normally closed emitter-receiver - dc driven detail to the broader combined photoelectric sensor family. The combined housing does not establish whether a reflector or the target returns the light. Sensing mode, light-on or dark-on selection and pin functions need the selected product diagram. ## Facts - Drawing form: Normally Closed Emitter-Receiver - DC Driven - Public vendor block names: HPE12B16 / VPE12B16. Autodesk identifiers, not standards database IDs. - Drawing purpose: combined photoelectric sensor - Graphic scope: Independently authored educational illustration; not certified standard geometry, a terminal pinout or a product footprint. ## Public references - [AutoCAD Electrical: Photoelectric emitter/receiver switches](https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-15ABE47A-723F-4004-BF2A-9CC285DE7882.htm) — Autodesk. Public Photoelectric Emitter/Receiver Switches table explicitly lists HPE12B16 / VPE12B16 with this operating or connection form. Vendor graphics are linked, not copied. ## Graphic scope Independent original educational concept illustration by Elora Grid. Not a certified standards graphic or manufacturer footprint. Unitless; not to scale. Original artwork licence: https://creativecommons.org/licenses/by/4.0/. Publisher material is linked only.