Incremental and absolute encoder

In the incremental encoder and absolute style. Such as linear and rotary encoder, incremental and absolute encoders have similarities, but in the wiring and identification. The difference between An incremental encoder pulse only read information, to provide relative motion on the shaft. It does not know the location information on electricity, which can only explain due to how far it has been moving on electricity. It reports back position with the change of these appliances. These flows can be either a single channel (a wire from the encoder output) or dual channel (double).

Incremental encoder is similar to a tape measure as it has no number, only the scale line. Such a device would show how far things have transfer, rather than the initial position. By contrast, lap, rotate, absolute value encoder to return what Angle it first in immediately to electricity. The encoder is used for industrial control application usually cannot be easily or quickly homing sequence with the robot. Absolute encoder as the position of the compass shows ITS for accurate, because it is viewed as soon as possible. A the resolution of the absolute encoder has A standard, such as the incremental encoder (PPR, PPI, etc.), but A home high-speed output click stream, output specified in binary format. Biggest encoder resolution = 2, where n = encoder output line, etc.).

So, 4 PPR absolute encoder has two output, an 8 absolute encoder PPR has three output, 16 PPR has four outputs, absolute encoder and so on. If power interruption, the location of the actual value will be known when the power supply recovery because in the each position of the rotation of the absolute encoder is the only binary values.

And a single ring absolute encoder disadvantage: the precise Angle encoder is obvious. After the electricity, but in front of the boot is not made laps. More absolute encoder is used to solve this problem.

More than ring absolute value encoder usually has a battery or super capacitor

How many revolutions to monitor encoder even in the power shut down. Many absolute encoder is a similar measure wheel increment per revolution at eleven o 'clock. These encoders and serial communication have often need special receiver decode their location information.

In general, the incremental encoder must be high speed on the connection to the input end, a PPR encoder, although this is not to create a high-speed pulse sequence. Industrial single absolute encoder, however, is designed to be connected to the I/O general automation.

Gray code

There is also a consideration when selecting single ring absolute encoder, it is a lot of nonstandard binary number.

Here are usually count the binary way: decimal number of binary code