The connection of encoder with PLC！

1, absolute and incremental encoder principle is not the same, wiring of course not the same. We are generally used are incremental type, only need to pay attention to good polarity, the signal can be PLC identification can be, and then began to record the value of the pulse to turn; and absolute encoder to read the code, with the pulse signal is not relationship.
2, the programming in the PLC will be based on its principle to distinguish: Incremental power-up to go back to the origin, and then start recording the pulse to be real-time location, and absolute type do not have to return to the origin, because it was read Is the location of the corresponding code, even if the location of power changes in the state, as long as not carrying the car to move it, this position will not change. Incremental counting only from the corresponding counter number to the location data out, while the absolute type will use the instructions will be converted to position data encoding ---- If the GRAY instruction does not support the PLC, but also their own large section of the Program to convert. Incremental also involves the issue of pulse frequency, small PLC to support the maximum frequency is limited; the absolute type is mainly points of the problem, small PLC provides IO point is limited.
3, the encoder access to the PLC is not just pick up, you have to provide high-speed PLC counter number found its corresponding encoder input point, so as to correctly read out the data to ---- for incremental, This is the set of the bar.
4, the above discussion is based on a small PLC using the encoder method, you have to add modules, or for large and medium-sized PLC, does not apply.

hybrid encoder, non-magnetic encoder, multi-turn encoder, multi-turn combination encoder, draw wire encoder, digital readout, linear scale

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