Multifunctional absolute converter

Description: TECHNICAL FIELD [Detailed description of the invention]

【0001】

[Technical field to which the invention belongs]

The present invention relates to a multifunctional absolute converter that can be applied to a user-specific interface each time.

【0002】

[Conventional technology and problems to be solved]

The absolute converter has a built-in conversion circuit that converts the detection signal of the absolute sensor into a digital position signal with preset specifications, and is configured to output a predetermined specific pattern of digital signals.

【0003】

Therefore, it is necessary to change the circuit of the absolute converter each time the required signal specifications change. Further, in order to write or erase the ROM in which the lookup table for signal conversion or the conversion control program is stored, it is necessary to remove it or create a writing circuit pattern separately. There is.

【0004】

An object of the present invention is to propose a multifunctional absolute converter capable of easily changing an output signal pattern or the like.

【0005】

[Means for solving problems]

Explaining with reference to FIG. 1, the multifunctional absolute converter 1 of the present invention is on the side of a plurality of sensors that can be connected to a plurality of absolute sensors 2 (1), 2 (2), 2 (3), and so on. Sensor-side input / output ports 4 equipped with connection terminals 3 (1), 3 (2), 3 (3) ... and the sensor-side connection terminals 3 (1), 3 (2), 3 (3), The conversion circuit 5 that converts the detection signals of each absolute sensor 2 (1), 2 (2), 2 (3) ... input via ... into a digital position signal, and the generated digital position signal. The upper input / output port 8 provided with the PLD 6 capable of performing predetermined processing, the output terminal 7 for outputting the digital position signal and the generated signal of the PLD 5, and the sensor side connection terminal 3 (1). , 3 (2), 3 (3) ... It is characterized by having a switching circuit 9 for switching, and a control circuit 10 composed mainly of a CPU, ROM and RAM for controlling each of the above parts. There is.

【0006】

Here, the switching operation by the switching circuit 9 can be controlled based on the switching control signal from the control circuit 10 or the switching control signal input via the upper input / output port 8.

【0007】

In the multifunctional absolute converter of the present invention configured in this way, a large number of absolute sensors can be connected, and the detection signal of each absolute sensor can be transmitted by switching the switching circuit 9 from the control circuit 10 or the host system side. It is possible to capture and detect the absolute position of the detection target by each absolute sensor.

【0008】

Further, since the PLD is built-in, various functions can be added or changed by rewriting the PLD or changing the control program stored in the ROM of the control circuit 10. For example, absolute position detection can be executed while performing various data processing. Examples of the data processing include data stabilization processing by the moving average method, self-calibration processing of the detection signal by the time conversion method by rotating the detection target at a constant velocity, and the like.

【0009】

Furthermore, by adding a pitch counter in the PLD, it becomes possible to output multi-digit bit data.

【0010】

Furthermore, since the PLD is built-in, it is possible to support user specifications with a high degree of freedom (direct connection to the user-side expansion bus, connection to FALAN, support for user-specific serial transfer formats).

【0011】

On the other hand, if a higher-level host computer is connected to the multifunctional absolute converter of the present invention, remote control and memory reference can be performed from the host computer side.

【0012】

In addition, the flash ROM in which the conversion lookup table connected to the conversion circuit is stored can be written at high speed via USB.

【0013】

[Effect of the invention]

As described above, since the multifunctional absolute converter of the present invention has a built-in PLD, it is possible to flexibly respond to user specifications by rewriting the PLD. Further, in the present invention, the detection axis can be switched, that is, the detection signals of a large number of absolute sensors can be selectively input, and the control target is multi-axis controlled based on the detection signals from a large number of absolute sensors. It is possible to realize a highly versatile multifunctional absolute converter suitable for use in the above.

[Simple explanation of drawings]

[Figure 1]

It is a schematic block diagram which shows the structure of the multifunctional absolute converter to which this invention is applied.

[Explanation of symbols]

1 Multi-function absolute converter 2 (1), 2 (2), 2 (3) ... Absolute sensor 3 (1), 3 (2), 3 (3) Sensor side connection terminal 4 Sensor side input / output port 5 Conversion circuit 6 PLD 7 Output terminal 8 Upper I / O port 9 Switching circuit to switch 10 Control circuit