BIN/OCT
IEC binary decoder (X/Y coder)
IEC coder marked BIN/OCT or similar, converting a binary input code into one active output.
IEC
IEC · X/Y
IEC general code converter (X/Y)
IEC element marked X/Y, the general coder converting one code, named X, into another, named Y.
In plain English
What does IEC general code converter (X/Y) mean?
The general coder additional drawing mark X/Y is replaced on a real symbol by the names of the input and output codes, such as BIN/GRAY or DEC/BCD. Where the codes are not standard, inputs and outputs carry numbers and a table on the drawing gives the relationship. TI's overview also shows coders embedded in larger symbols to produce affecting inputs for dependency notation.
A simple example
On control and protection logic drawings, a code converter may represent a lookup in a PLC or a hardware coder converting a selector position code into commands. Including the conversion table is essential because the X/Y label alone does not define the mapping for non-standard codes.
What the drawings help you do
The element does not state travel timing or behaviour for invalid input codes. State those in notes where they matter.
This particular reference
IEC element marked X/Y, the general coder converting one code, named X, into another, named Y. Specific coders such as BIN/OCT or BCD/7SEG are instances of this general form with standard code names.
- Signal
- Electrical information passed between devices, rather than necessarily the main power supply.
- Schematic
- A drawing showing function and connections rather than physical appearance.
Read the source: Overview of IEEE Standard 91-1984: explanation of logic symbols (SDYZ001A)
IEC · Rectangular element with X/Y qualifier where X and Y name the codes
Qualifying-symbol and dependency conventions as explained in TI's public overview of IEEE Std 91-1984, which incorporates IEC 617-12 work. Independent educational drawing; not certified IEC geometry or an IEC database identifier.
Shown as an independently authored educational illustration. Use the cited publication and drawing legend to verify the required drafting form.
Schematic · X/Y
What it represents
The general coder qualifier X/Y is replaced on a real symbol by the names of the input and output codes, such as BIN/GRAY or DEC/BCD. Where the codes are not standard, inputs and outputs carry numbers and a table on the drawing gives the relationship. TI's overview also shows coders embedded in larger symbols to produce affecting inputs for dependency notation.
On control and protection logic drawings, a code converter may represent a lookup in a PLC or a hardware coder converting a selector position code into commands. Including the conversion table is essential because the X/Y label alone does not define the mapping for non-standard codes.
The element does not state propagation timing or behaviour for invalid input codes. State those in notes where they matter.
How to read it
- Replace X and Y with code names on a real symbol.
- Look for a conversion table on the sheet.
Information to show or reference
- Name both codes or provide a table.
- Number inputs and outputs consistently with the table.
- State behaviour for invalid codes.
A distinction that matters
Specific coders such as BIN/OCT or BCD/7SEG are instances of this general form with standard code names.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
Overview of IEEE Standard 91-1984: explanation of logic symbols (SDYZ001A)
General coder qualifier and use of a coder to produce affecting inputs.
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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