位移传感器

   linear displacement sensor products based on relative position (relative position is the position General position) represents the absolute position (due to internal has set the total length, so relative position becomes the absolute position), without loss of data after the power outage, automatically after power recovery. the linear displacement sensor signal is a voltage or current, are analog signals. after the analog signal as long as the set zero position and construction, is an absolute signal. these signals will not be transmitted even when there are missing, no error occurs.

   in linear displacement sensor this question first to put this issue into a solid row, such as linear displacement sensor for a KTC-400mm, When an access instrument or PLC time, when minimum output is 0Vdc, on behalf of the corresponding location 0Mm, position the maximum output is 10Vdc (or 5Vdc, not repeat them here), on behalf of the corresponding location is 400mm (this is already set by the computer). due to our location and set the voltage output is linear (instrumentation or computers have been set), output 5Vdc to corresponding position 200mm and other locations that were also in (0V,0mm), (10V,400mm) the two points on the line. of course, because of the building of a certain degree of error (do not repair errors more likely), the output voltage deviates from the corresponding location there is a small, approximately ± 0.05%FS (full stroke). there is also a problem, if in the above set of conditions, customer selection and installation error of KTC-50mm, then there will be displayed and the actual location of the problem. this is why? Because Computers can only understand when setting 10Vdc corresponds to 400mm, then you now even if the linear displacement sensor 500mm position, displays only the 400mm, if the linear displacement sensor 5V output location, namely 250mm, which shows only 200mm. do? This is as long as the set 10vdc 500mm corresponds to 400mm, it is rewritten to 10vdc corresponds to., of course, can also turn to set, 0vdc corresponds to 400mm position, 10vdc 0mm location, computer work.
      

the above is linear displacement sensor 10Vdc power supply directly, instrument or PLC is also required to input voltage conditions. if no 10Vdc power supply, so that will only be the 24Vdc power supply, if the instrument or PLC requires a voltage 0~10Vdc input, you can use an external voltage module, will convert the output signal of linear displacement sensor 0~10Vdc; if the instrument or PLC 4~20mA you will linear displacement sensors converts the output signal 4~20mA signal.
            pulse signal is different, for example: incremental pulse encoder (also linear pulse meter), three-phase pulse signal lines a, b, z, a, b line, individually connected to the a or b line (power supply is a public terminal) lap is 3,600 pulses per revolution, 3,600 or receive a pulse knew turning in a circle, if there are several more external interference pulses come in, less than a lap received to 3,600 pulse, you will make mistakes, so the incremental encoder, there is a z-pulse signal, that is a check digit, each round was moved to give a pulse for data reduction, that is with or without interference came in, there are no missing pulse signals, all round. well, since a and b separate output, why answer a, b two phase? That's because, if the direct phase one of a, b, encoder or in forward, reverse, pulse up the extension, you will not be able to distinguish between what to the encoder shaft angular position. only on the a and b at the same time, forward pulse increases, reverse pulse reduced, no matter what encoder Pro and con turns, you will know the exact location. such encoder a, b and z-phase effect is clear. in addition, the power cut is powered on again, the original data may be lost and will need to be reset. if required before powering down without losing the data, very complex work needed to be done, 1, you first need to flush all data stored by the memory backup battery (button cell), 2, memory speeds are fast enough in order to keep up with the speed of movement, such as: 3600 pulses per revolution, turns one round per second, Rotation 3.6 every millisecond pulses 4 pulses, each pulse only 0.27 milliseconds, you must enable data refresh are stored as 0.25 milliseconds faster than 0.27 milliseconds, about frequency of 4000Hz, even cover the technology, there are can leak off a pulse;
        so, with is such complex to achieved this off electric not lost data of function, also than development a not needs so complex storage of coding device, that is "absolute coding device", absolute coding device due to is each a location corresponds to a only of "pulse group" recognition signal, such a "pulse group" signal needs transmission out, Need wire side by side, the "pulse-group" number, basically on how many wires are needed, of course, the positive and negative the source line, possibly the CLOCK and DATA lines. this would explain in detail in absolute encoders.