![]() The output from these incremental encoders is usually two discrete signals, like an NPN or PNP sensor, high or low. They consist of a simple set of light and dark lines around a disk’s face, with light either blocking or passing through/reflecting depending on the optical type.įigure 1. The incremental encoder is used for high-speed, continuous rotations where both velocity and position need to be known. There are two main types of encoders: incremental and absolute. To understand why this is commonly used for absolute, but not incremental encoders, we should investigate each type to contrast the signal streams. It is relatively simple to understand compared to other communication protocols but has one major advantage: The processor controls the data timing. One common type of data output stream from rotary absolute encoders is the SSI. ![]() This form of data transmission is the most common occurrence for absolute and incremental encoders feeding data back to a PLC or motion driver. Although the name contains the term serial, like the common industrial serial RS-232 protocols, this is a simple way to transmit information. Many encoders use a form of signal communication called SSI (synchronous serial interface).
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