Rotating to turn the output pulse incremental encoder, through counting device to know its position, when the encoder or power failure, rely on counting device's internal memory to remember the location.
So, after the power outage, there cannot be any movement, encoder when calls work, in the process of the encoder output pulse, also can't be a pulse interference and loss, otherwise, the counting device memory of zero offset, and the amount of the offset is don't know, can only know wrong after the production results.
Every solution is to increase the reference point, encoder through reference point, to amend the reference position into the counting device memory location.
Before the reference point, can't be ensure the accuracy of the position.
Therefore, in the industrial control is look for the reference point, each operation boot method such as the change.
Printers, scanners, for example, the positioning of the principle is to use incremental encoder, the computer, we can all hear chip, li crash of a ring, it is looking for a reference zero, then work.
Such an approach to some industrial projects more troublesome, even not allowed to start up the change (
After startup to know accurate location)
, and there was the emergence of the absolute encoder.
Absolute encoder, because its every position only, anti-interference, absolutely no power lost memories, already more and more widely used in various industrial Angle, length measuring and positioning control of systems.
Absolute value encoder optical encoder, there are many scribed line, every groove in turn in 2 lines, lines to line 4, 8, 16.
Arrangement, so, in every position of encoder, by reading each groove and the dark, get a set of zero power from 2 to the n - 2
The only 2 hexadecimal codes (1 to the power
, this is called a n a absolute encoder.
The encoder is determined by mechanical position encoder, it is not affected by power outages, interference.
Absolute encoder is determined by mechanical position of the uniqueness of each position, it does not need memory, don't need to find a reference point, and don't always count, when you need to know, when to go to read it.
In this way, the anti-interference characteristics of the encoder, the reliability of data greatly improved.
Shanghai electronic products co. , LTD. , is 26 years old, encoder manufacturers, specializing in the production of various kinds of incremental encoder, absolute encoder encoder models complete, stable and reliable quality, professional supply of well-known brands at home and abroad, of British Columbia and basing on quality market, looking for a coder manufacturer is looking for electronic.