The effect of encoder.！

Satisfactory answer praise rate: 100% incremental encoders are generally open collector output, the voltage output or linear output, the output of the A-phase, B-phase, Z-phase pulse, etc., generally if not still recorded after power failure location occasion can be an incremental encoder, incremental encoder can be connected to a high counting function PLC, the counter can also be connected to conventional absolute encoder output is a binary code or Gray code, etc., even after the power is turned off the current record position absolute encoder needs to access, for example CQM1H-ABB21 this absolute encoder interface board, a high number of ordinary PLC counters can not take absolute encoder or, if the operation frequency is not very high, and the voltage within specifications, it is an absolute encoder can also access common PLC input point, be programmed by a program according to which the encoder output code specifications can also be an incremental encoder: consists of a center photoelectric encoder shaft on which a ring through dark engraved lines, optoelectronic transmitting and receiving device to read, get a sine wave signals into four groups a, B, C, D, each sine wave phase difference of 90 degrees difference (with respect to a cycle of 360 degrees), the C, D signal inversion, superimposed on the a, B two-phase, can enhance signal stability; the other output per revolution Z-phase pulse to represent a zero reference position. Since the A, B two-phase difference of 90 degrees, the first phase A or B by comparing the first phase, in order to determine the encoder forward and reverse, the zero pulse can be obtained encoder zero reference position. Absolute encoders: absolute encoder there are many optical encoder dynasty channel groove, each groove successively with 2-wire, 4-wire, 8-wire, 16 wire ...... choreography, so that in each position encoder, each track by reading the engraved lines through the dark, get a group from the n-1 th power of the unique binary code (Gray code) to 2 2 to the zero power, which is called n-bit absolute encoder . Such encoders are mechanically position the photoelectric encoder of the decision, it is not a power outage, the impact of interference. Each absolute position encoders determined by the mechanical position is unique, it requires no memory, no need 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. As can be seen from the above description: Both have advantages and disadvantages, incremental encoders relatively common, most of this occasion. From the price perspective, the absolute encoder generally much more expensive, and there are absolute encoder measuring range, it is generally on the machine with special needs used more often.

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