Optical Encoder Pulse Counting with a PLC

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...

Ladder Logic to Decode Direction from an Optical Encoder

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...

The HR12 HEDS Replacement Optical Encoder

April 27, 2013

HEDS style encoders have long been a popular choice for an enclosed low line count positional feedback device. The packaging allows for added enclosure protection in a lighter duty encoder. This type of product is often seen in applications such as vending machines, printers, plotters, positioning tables, etc.

Interfacing to 26C31 Line Drivers in QDI Rotary Encoders

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...

Preferred Wiring Methods for Optical Encoders

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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