June 29, 2014
Which Encoder Wires Should I Use to Begin Understanding Incremental Encoder Signals? Channels A & B (Incremental Channels) Use only A (or only B) for an RPM or counting applications where the rotation is either unidirectional, or where you don’t need to know direction. Use A and B together to...
June 17, 2014
Gray code was named for Frank Gray, a Bell labs researcher, who patented the procession in 1953, even though a form of it was used by Emile Baudot for telegraphy as early as 1878. The most important thing to understand about Gray code is that only one bit changes from...
June 4, 2014
. Interfacing to an Incremental Encoder using an Optoisolator When I chose the PLC that I wanted to build incremental encoder applications around, The DL06 seemed like a perfect low cost option, but what I failed to notice was that it had a minimum 12V input requirement to turn on...
May 6, 2014
How to Build a Portable Incremental Encoder Tester Every once in while, it’s nice to have a handheld device that can be used to see quickly if encoder signals are present. I designed and built a quick-tester that allows for fast interface to an encoder without having to drag out...
April 27, 2014
. I have interfaced a 200 line count QR145 optical encoder to a DL06 PLC. The PLC’s inputs are set up in high speed mode to receive the incremental quadrature pulses coming from the optical encoder. . CT174, the designated high speed up/down counter is used to interface to the...
April 23, 2014
I have interfaced a 200 LC QR145 to a DL06 PLC to show how to convert from a line count to mechanical degrees. This type of conversion may be useful for any application of optical encoder to measure angles. To calculate a degree measurement we divide 360 by the line...
April 19, 2014
I have interfaced a QR145 200 Line Count Optical Encoder to a DL06 PLC and set up the PLC for mode 20 ‘High speed Up/Down counter’. Here is a video of Optical Encoder Counting: Below is the ladder logic code for programming the PLC to count pulses from the QR145...
April 15, 2014
I set up a QR145 optical encoder on a Direct Logic DL06 PLC with some simple Ladder Logic to determine direction based on the A and B incremental inputs. Below is a video of the optical encoder in action: In the PLC I used (DL06), the inputs are filtered, which...
March 26, 2014
While most of us are familiar with how to measure something in mechanical degrees, incremental optical encoder signals are measured in electrical degrees. 360 electrical degrees is the period in which a signal completes one high to low transition. This can be in any sort of waveform, but for encoders...
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