Pepperl + fuchs encoder resolution and precision overview

When choosing a Pepperl+Fuchs encoder, not only its type, but also the interface, resolution, accuracy, protection level and other aspects must be considered to meet the user's control requirements. In particular, resolution and accuracy are closely related to motion control. Resolution refers to the distance generated between each counting unit of the encoder, which is the small Z distance that the encoder can measure. For rotary encoders, the resolution is generally defined as the unit or pulse measured by one revolution of the encoder (eg, PPR). For linear encoders, the resolution is often defined as the distance between two quantization units, usually given in micrometers (μm) or nanometers (nm). The resolution of an absolute encoder is generally defined in the form of bits, because the output of an absolute encoder is a binary "word" based on the actual position of the encoder. One bit is a binary unit, such as 16 bits equals 216, or 65536. Therefore, a 16-bit encoder provides 65536 quantization units per revolution.

The accuracy of Pepperl+Fuchs encoder is mainly used to measure the value of the repeatable average deviation between the actual value and the set value under normal conditions. For rotary encoders, it is generally defined as arc seconds or arc minutes. For encoders, the accuracy is generally microns. High resolution does not mean high accuracy. For example, two rotary encoders with the same accuracy, one has a resolution of 3600 PPR, and the other has a resolution of 10000 PPR. The low-resolution encoder (3600 PPR) can provide a measurement distance of 0.1°, while the high-resolution encoder can provide a smaller measurement distance, but the accuracy of the two is the same. The high-resolution encoder is only It has the ability to reduce 0.1° to a smaller incremental distance.