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...
June 10, 2013
Since most electronics are set up to have high input impedance, in some situations the addition of a loading or “termination” resistor can help to reduce interference from electrical noise. This can be of particular help when implementing an incremental encoder where there is a long cable run. If the...
March 2, 2013
Encoder Electrical Structure The internal electrical structure of the QDI series of encoders consists of a photo interrupted light source that is picked up by a common mode photo detector array. “Common mode” means that there are two channels that are at exact opposite states in any position. The advantage...
February 26, 2013
Following these guidelines will reduce the possibility of noise, false counts, ground loops, and other power related problems. Keep cable lengths as short as possible The longer the cable length, the more likely it is to act as an antenna and pick up unwanted noise. Keeping the lengths short reduces...
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