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...
February 22, 2014
What is the purpose of an Optical Quadrature Encoder on the back of a motor? Incremental Optical Encoders will often provide commutation “Hall signals” for timing of the BLDC windings, but I am going to forgo that discussion and turn instead to the Incremental Encoder channels, specifically A and B...
November 20, 2013
The QDH20 is an IP66 sealed encoder made for the rugged duty of an industrial application. Due to the huge array of configuration options, this optical encoder has over 200,000 possible ways that it can be configured. While this is certainly an advantage to an end user that may be...
September 14, 2013
A standard edge sensing scheme for optical rotary encoders is to square up the raw analog sine wave by comparing it against a given voltage. If your analog signal has a 2Vpp amplitude, the value at which you switch off of, creating the edges of your square waves, could be...
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