Grey Code is used because only one bit of data will change at a time. The following chart shows the conversion of Grey Code to Binary.
|Number||Binary Code||Grey Code||Number||Binary Code||Grey Code|
It is essential for absolute encoders because if the power is interrupted, the encoder will know where it is within the one bit.
Power is interrupted when the encoder is between 7 and 8. If we look at Binary Code, all of the bits would be affected, and we would not be sure what number we are looking at for the encoder. Therefore we have lost our position. In Grey Code, only one bit changes, so we can still tell if we were on 7 or 8 if the power was interrupted.
The following sample PLC program will convert 4-bit grey code into binary code.
This code was written in an Automation Direct PLC software called Do-more Designer.
Do-more Designer Software
How to use videos for Do-more Designer Software
Contact me for the above program. I will be happy to email it to you.
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4 thoughts on “Here’s a Quick Way to Convert Grey Code into Binary for PLC”
Nice, Very Helpful
Thank you for the comment, Taha Anverali.
I’m glad that you found it helpful.
Could you email the above code for converting gray code.
Here is a link to the Do-More Designer PLC program.
I will also email this to you.