The absolute servo motor encoder.！

Incremental encoder output pulse is rotated by a 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 methods for some industrial projects too much trouble, not even allowed to give change boot (boot will know the exact location), so there is an absolute encoder appears.

Absolute rotary optical encoder, because each location is absolutely unique, interference, without power-down memory, has become increasingly widely used in various industrial systems point of view, the length of the measurement and positioning control.

There are many road reticle absolute encoder code plate, each groove successively with 2 lines, 4 lines, 8 lines, 16 lines ,,,, choreography, so that in each position encoder by reading each channel scribing through the dark, get a group from the 2 n-1  power of only binary coding (Gray) to the zero power, which is called n-bit absolute encoder. Such encoder is a mechanical encoder position determined, it is not a power outage, the impact of interference.

Uniqueness of each absolute encoder position determined by the mechanical position, absolute encoder without memory, without having to find a reference point, and would not have to count, when you need to know where and when to go read its position. Thus, interference encoder properties, has greatly enhanced the reliability of the data.

Since the absolute encoder positioning clearly superior to incremental encoder has been increasingly applied to the servo motor. Absolute encoders because of its high accuracy, the output bit more, if you still use parallel outputs, each of which an output signal of the need to ensure a good connection, but also for more complex conditions isolation, the number of multi-core cable connection, thereby inconvenience and reduced reliability, and therefore, the absolute encoder multi-bit output type, generally use the serial output or bus output, the German production of absolute encoder is the most common serial output SSI (synchronous serial line output).

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