Incremental and absolute encoder！

An encoder according to the principle can be divided into incremental and absolute categories. Incremental encoder displacement is converted into periodic electrical signals, then converted into electrical signals that count pulse represents the magnitude of displacement by the number of pulses. Absolute encoders at each position corresponding to a certain digital code, so its value is only shown with the beginning and end of the measurement, but not to the middle of the process measurement.

Incremental rotary encoder rotates the output pulse by counting device to know its position when the encoder does not move or power outage, counting on internal memory to remember the location of the device. Thus, when the power failure, the encoder does not have any movement, when work calls, encoder output pulse process, it can not have lost the pulse interference, otherwise, it will count zero offset memory device, and this bias the amount of shift is no way to know, to know only after the wrong production results appear. The solution is to increase the reference point, the encoder after every reference point, the reference position correction position count into the memory device. In the previous reference point, it is not guarantee the accuracy of the location. To this end, every operation in the industrial in there to go first reference point, turn the change and other methods. Such encoder is a mechanical encoder position determined, it is not a power outage, the impact of interference.

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