JP2014002034A - Displacement measuring device and displacement measuring method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To input displacement data signals from each of a plurality of displacement sensors, and to properly output them.SOLUTION: A displacement measuring device has temporarily storing devices which are provided so as to respectively correspond to a plurality of displacement sensors, and in which displacement data signals outputted from each of the displacement sensors are inputted and temporarily stored synchronously with clock signals from the displacement sensors of output source of the displacement data signals as serial data; and output means for successively selecting any of the temporarily storing devices, and outputting the displacement data signal stored in the selected temporarily storing device synchronously with a predetermined clock signal as serial data.

Description

  Embodiments described herein relate generally to a displacement measuring apparatus and a displacement measuring method.

An example of the installation form of the conventional displacement measuring apparatus is shown in FIG.
Conventionally, a large rotating machine such as a turbine has a very heavy casing. Therefore, when the machine is assembled, the relative position (displacement) between the rotating shaft of the rotating machine and the casing (housing) is determined by the weight of the casing. It depends on. For this reason, it is necessary to measure the displacement of each part of the rotating shaft and monitor the displacement change amount.

In the example shown in FIG. 8 (a), a rotating shaft 102 is provided inside a casing composed of an upper casing 101a and a lower casing 101b, and between the rotating shaft 102 and the bottom and side portions of the lower casing 101b, A plurality of displacement sensors 103 for measuring the displacement of the rotating shaft 102 are provided.
A plurality of these displacement sensors are provided along the axial direction of the rotating shaft 102 as shown in FIG.

Since the displacement can be caused not only when the casing is attached / detached but also due to a change with time, the displacement must be measured periodically.
For example, a digital output type displacement sensor is used to detect the displacement of the rotating shaft. Since this displacement sensor outputs a measurement result signal as a digital signal, there is an advantage that there is no deterioration in accuracy during data transmission compared to an analog output type displacement sensor.

  The displacement sensor outputs the measured displacement amount to the displacement measuring device as a serial digital signal synchronized with the clock signal from the measuring source displacement sensor.

A configuration example of a conventional displacement measuring apparatus is shown in FIG.
As shown in FIG. 9, the conventional displacement measuring device includes a multiplexer 104 and an MPU 105.
The multiplexer 104 a selects one of the displacement sensors in synchronization with the serial clock signal that is the clock signal from the MPU 105. The multiplexer 104 inputs a sensor data signal indicating the displacement measurement data (displacement data signal) from each of the plurality of displacement sensors as serial data in synchronization with the sensor clock signal from the selected sensor, and supplies it to the MPU 105. Output.

A configuration example of a conventional displacement indicator is shown in FIG.
As shown in FIG. 10, the conventional displacement indicator includes shift registers 111a to 111g for inputting sensor data signals from the displacement sensor, 3-8 decoder driver 112, BCD-7 segment decoder driver 113, driver 114, LED display. 115 and 7 segment LED indicators 116a-116d.

  The shift registers 111a to 111g are cascaded in the order of shift registers 111a, 111b, 111c,..., 111d, 111e, 111f, 111g as viewed from the input side from the displacement sensor. Hereinafter, the shift registers 111a to 111g are simply referred to as the shift register 111 as necessary.

The shift register 111a is a shift register for storing the decimal point position of measurement data.
Further, the shift registers 111b, 111c,..., 111d, 111e are shift registers for storing each digit of measurement data.
The shift register 111f is a shift register for storing a code.
The shift register 111g is a shift register for storing header data.

  Further, the BCD-7 segment decoder driver 113 corresponding to each digit of the measurement data is composed of BCD-7 segment decoder drivers 113a, 113b,... 113c, 113d, and one pair is provided to the shift register corresponding to each digit of the measurement data. 1 is provided.

  The 7-segment LED display 116 corresponding to each digit of the measurement data includes 116a, 116b,..., 116c, 116d, and corresponds to the shift register 111 corresponding to each digit of the measurement data and each digit of the measurement data. The BCD-7 segment decoder driver 113 is provided on a one-to-one basis.

  In the example shown here, the sensor data signal is represented by a BCD (Binary Coded Decimal) code (binary decimal representation). In this BDC code, a method is used in which one digit in decimal representation is represented by a 4-digit binary number (4 bits) representing 0 to 9. For example, the sensor data signal is output in 13 digits (52 bits) with 4 bits as 1 digit.

  Specifically, for example, the sensor data signal includes a header, a sign, a measurement data first digit (BCD code), a measurement data second digit (BCD code), ..., a measurement data fifth digit (BCD code), and measurement data. The sixth digit (BCD code) and the measurement data decimal point position (BCD code) are input to the shift register 111 of the displacement indicator in this order.

When the input of the sensor data signal to the shift register 111 of the displacement indicator shown in FIG. 10 is completed, the header is stored in the shift register 111g and the code is stored in the shift register 111f. The first digit (BCD code) of measurement data is stored in the shift register 111e, the second digit (BCD code) of measurement data is stored in the shift register 111d, and the fifth digit (BCD code) of measurement data is stored in the shift register 111c. The sixth digit (BCD code) of the measurement data is stored in the shift register 111b. The decimal point position (BCD code) of the measurement data is stored in the shift register 111a.
The code stored in the shift register 111f is displayed on the LED display 115 for code display via the driver 114.

  Each digit of the measurement data stored in the shift register 111 corresponding to each digit of the measurement data is converted into 7 bits by the BCD-7 segment decoder driver 113 corresponding to each digit and corresponds to each digit of the measurement data. Is displayed on the 7-segment LED display 116.

  The measured data decimal point position stored in the shift register 111a is displayed on any of the 116a, 116b,..., 116c, and 116d on the 7-segment LED display 116 via the 3-8 decoder driver 112.

  In other words, this displacement indicator can be easily obtained by fetching the sensor data signal output in synchronization with the clock signal output from the displacement sensor into the shift register 111 of the displacement indicator and using the BCD-7 segment decoder driver 113. 7-segment LED indicators 115 and 116 can be displayed.

Mitutoyo Corporation, Product Information Contact Sensor Output Signal Type Digimatic Output Specifications, [online], [Search May 16, 2012], Internet <URL http://www.mitutoyo.co.jp/products/seimitusensor/menu /no4076p29.pdf>

  When the above-described displacement sensor is used for measuring the displacement change amount of the rotating machine, it is necessary not only to display the displacement on a displacement indicator but also to record the measurement result on an electronic medium or print it on a printer. For such applications, the above-mentioned BCD format data is unsuitable for handling, so it is desirable to handle it with a character code such as ASCII (American Standard Code for Information Interchange).

  In addition, as shown in FIG. 8, when there are a lot of displacement measurement points, it is necessary to use a large number of displacement sensors. In this case, the sensor clock signal for synchronizing the sensor data signal has an arbitrary timing from each sensor. Is output. For example, when this signal is taken into the MPU, a serial signal which is a sensor data signal from a large number of sensors is simultaneously converted into a sensor clock signal whose timing is asynchronous between the sensors by a displacement indicator as shown in FIG. It is difficult to properly capture the displacement indicator at the timing.

  The problem to be solved by the present invention is to provide a displacement measuring apparatus and a displacement measuring method that can input displacement data signals from each of a plurality of displacement sensors and appropriately output them.

  According to the embodiment, the displacement measuring device is provided corresponding to each of the plurality of displacement sensors, and the displacement data signal output from each of the displacement sensors is converted to a clock from the displacement sensor from which the displacement data signal is output. A temporary storage device that inputs serial data in synchronism with a signal and temporarily stores it, and selects one of the temporary storage devices in order, and uses a displacement data signal stored in the selected temporary storage device as a predetermined clock signal Output means for synchronously outputting serial data.

  According to the present invention, displacement data signals from each of a plurality of displacement sensors can be input and output appropriately.

The figure which shows the structural example of the displacement measuring apparatus in 1st Embodiment. The figure which shows the structural example in the serial data buffer of the displacement measuring device in 1st Embodiment. The flowchart which shows an example of the operation | movement procedure by the displacement measuring device in 1st Embodiment. The figure which shows the structural example in the serial data buffer of the displacement measuring device in 2nd Embodiment. The flowchart which shows an example of the operation | movement procedure by the displacement measuring device in 2nd Embodiment. The figure which shows the structural example in the serial data buffer of the displacement measuring device in 3rd Embodiment. The flowchart which shows an example of the operation | movement procedure by the displacement measuring device in 3rd Embodiment. The figure which shows an example of the installation form of the conventional displacement measuring apparatus. The figure which shows the structural example of the conventional displacement measuring apparatus. The figure which shows the structural example of the conventional displacement indicator.

Hereinafter, embodiments will be described with reference to the drawings.
(First embodiment)
First, the first embodiment will be described.
FIG. 1 is a diagram illustrating a configuration example of a displacement measuring apparatus according to the first embodiment.
As shown in FIG. 1, the displacement measuring apparatus in the first embodiment includes serial data buffers 11a to 11h, multiplexers 12a and 12b, an MPU 13, a serial printer 14, and a memory card 15.

  In this example, there are eight displacement sensors connected to the displacement measuring device and outputting sensor data signals and sensor clock signals to the displacement measuring device. Hereinafter, the displacement sensor is simply referred to as a sensor as necessary.

  Each of these sensors is provided with serial data buffers 11a to 11h in a one-to-one correspondence. Hereinafter, the serial data buffers 11a to 11h are simply referred to as a serial data buffer 11 as necessary.

  The serial data buffer 11 of the displacement measuring device inputs the sensor data signal output from each of the corresponding sensors as serial data in synchronization with the sensor clock signal from the sensor from which the sensor data signal is output. Temporarily save as measurement data.

  When the multiplexer 12a receives the serial clock signal from the MPU 13 at a predetermined timing, the multiplexer 12a selects the serial data buffer 11 corresponding to any one of the sensors, and the serial data buffer 11 from the MPU 13 selects the selected serial data buffer 11. The clock signal is re-output as it is, and thereafter, every time the serial clock signal is input from the MPU 13, the serial clock signal from the MPU 13 is re-output to the selected selected serial data buffer 11. This output clock signal is referred to as a host clock signal. In the present embodiment, selecting the serial data buffer 11 corresponding to a certain sensor may be described as selecting the corresponding sensor.

  In addition, when the serial clock signal is input from the MPU 13 at the predetermined timing described above, the multiplexer 12b selects the same serial data buffer 11 as the multiplexer 12a, and the sensor data signal temporarily stored in the selected serial data buffer 11 is multiplexed. The data is input as a host data signal in synchronization with the host clock signal from 12 a to the serial data buffer 11 and output to the MPU 13.

  The switching period of the serial data buffer 11 to be selected by the multiplexers 12a and 12b includes at least the time taken from the start to completion of the output of the sensor data signal input to the selected serial data buffer 11 to the MPU 13. The number of host clock signals output during this period is equal to or greater than the number of bits of the sensor data signal from the serial data buffer 11.

  That is, one of the serial data buffers 11 corresponding to each sensor is selected, and the selected serial data buffer 11 has a number corresponding to the number of bits of the sensor data signal temporarily stored in the serial data buffer 11. A host clock signal is output, and in synchronization with the host clock signal, each bit of the temporarily stored sensor data signal is output to the MPU 13 via the multiplexer 12b.

  When the multiplexer 12a, 12b receives the serial clock signal from the MPU 13 at the timing when the output of each bit of the data signal is completed, the multiplexer 12a, 12b newly selects one of the serial data buffers 11 corresponding to each sensor, and selects the selected serial data. The host clock signal and the host data signal are input / output between the data buffer 11 and the multiplexers 12a and 12b.

  The MPU 13 converts the measurement data indicated by the input host data signal into a character code and writes it to the memory card 15 via the card interface 13b in the MPU 13, or to the serial printer 14 via the serial port 13a in the MPU 13. Send it to print.

FIG. 2 is a diagram illustrating a configuration example in the serial data buffer of the displacement measuring apparatus according to the first embodiment.
As shown in FIG. 2, each of the plurality of serial data buffers 11 includes a shift register 21, a multiplexer 22, a header data memory 23, a comparator 24, a counter 25, a register 26, and a determination circuit 27.

  The shift register 21 has a 4-bit configuration, and shifts the measurement data decimal point position (BCD code) from the sensor input side to the MPU 13 output side, and stores each digit of the measurement data. , 21d, 21e, a shift register 21f for storing codes, and a shift register 21g for storing header data are connected in cascade. Further, a shift register 21h is cascaded to the shift register 21f.

  The shift registers 21a, 21b, 21c,..., 21d, 21e, and 21f are provided with multiplexers 22 on a one-to-one basis. The multiplexer 22 selects either a sensor clock signal that is a serial clock signal from the corresponding sensor or a host clock signal that is a serial clock signal from the MPU 13 side, and outputs the selected signal to the corresponding shift register 21.

  The multiplexer 22 stores the measurement data decimal point position (BCD code) in the shift register 21a, and outputs each digit of the measurement data to the shift registers 21b, 21c,. In the period in which the stored code is stored in the shift register 21f and the header data is stored in the shift register 21g, the sensor side is selected, the sensor clock signal from the selected sensor side is input, and the corresponding shift register 21 is input. Output for.

  Accordingly, each bit of the sensor data signal output from the sensor side is input to the shift register 21 via the multiplexer 22 in synchronization with the sensor clock signal, and the shift registers 21a, 21b, 21c,..., 21d, 21e are input. , 21f, 21g.

  Further, the multiplexer 22 selects the MPU 13 side at the start timing of a predetermined period to be output to the MPU 13 after the input to the shift register 21 is completed for the most significant bit to the least significant bit of the sensor data signal. A clock signal is input, and this host clock signal is output to shift registers 21a, 21b, 21c,..., 21d, 21e, 21f, which are corresponding shift registers. The host clock signal is also input to the shift register 21h.

  Thereby, each bit of the sensor data signal stored in the shift registers 21a, 21b, 21c,..., 21d, 21e, 21f is synchronized with the host clock signal, and the shift registers 21a, 21b, 21c,. 21e, 21f, and 21h are shifted in the order from the sensor input side to the output shift register 21 to the MPU 13, and output to the MPU 13 through the multiplexer 12b as a host data signal.

  The comparator 24 stores the header data stored in the shift register 21g and the header data memory 23 at a predetermined timing at which output from the shift register 21 to the MPU 13 is to be started for the most significant bit to the least significant bit of the sensor data signal. The stored predetermined header data is compared, and the result of whether or not they match is stored in the shift register 21h as flag information. The stored flag information is output to the MPU 13 via the multiplexer 12b in synchronization with the host clock signal.

  The sensor clock signal input from the sensor side is counted by the counter 25. The determination circuit 27 determines the count number counted by the counter 25 and the predetermined number stored in the register 26 at a predetermined timing when the output from the shift register 21 to the MPU 13 is to be started for the most significant bit to the least significant bit of the sensor data signal. And the result of whether or not they match is stored in the shift register 21h as flag information. The stored flag information is output to the MPU 13 via the multiplexer 12b in synchronization with the host clock signal. The predetermined count number is a count number to be counted by the counter 25 when the most significant bit to the least significant bit of the sensor data signal is normally input.

  In addition, the determination circuit 27 determines whether the count number counted by the counter 25 is 0 at a predetermined timing at which output from the shift register 21 to the MPU 13 is to be started for the most significant bit to the least significant bit of the sensor data signal. That is, the result of determining whether or not a signal is input without a sensor connected is stored in the shift register 21h as flag information. The stored flag information is output to the MPU 13 via the multiplexer 12b in synchronization with the host clock signal.

FIG. 3 is a flowchart illustrating an example of an operation procedure performed by the displacement measuring apparatus according to the first embodiment.
As an initial state, the multiplexers 12a and 12b shown in FIG. 1 select the serial data buffer 11 corresponding to one of the eight sensors according to the serial clock signal input from the MPU 13 at a predetermined timing. . The multiplexer 12a outputs a host clock signal to the selected serial data buffer 11.

  The multiplexer 22 of the serial data buffer 11 corresponding to the selected sensor selects the sensor side until the input from the most significant bit to the least significant bit of the sensor data signal is completed to the shift register 21. In this selected state, each bit of the sensor data signal output from the sensor side is input to the shift register 21 in synchronization with the sensor clock signal, and the shift registers 21a, 21b, 21c,..., 21d, 21e, In the order of 21f and 21g, they are shifted from the sensor input side toward the output side shift register 21 to the MPU 13 and stored (step S1).

  When the predetermined timing at which output from the shift register 21 to the MPU 13 is started for the most significant bit to the least significant bit of the sensor data signal is reached, the multiplexer 22 of the serial data buffer 11 corresponding to the selected sensor switches the MPU 13 side. select. As a result, the cascaded connections 21a, 21b, 21c,..., 21d, 21e, 21f and the shift register 21h can receive the host clock signal.

  When it is time to start the output from the shift register 21 to the MPU 13 from the most significant bit to the least significant bit of the sensor data signal, the comparator 24 stores the header data stored in the shift register 21g and the header data memory 23. The stored predetermined header data is compared (step S2). If they do not match (NO in step S3), the comparator 24 generates flag information indicating the result (step S8) and stores the flag information in the shift register 21h. The stored flag information is output to the MPU 13 via the multiplexer 12b in synchronization with the host clock signal.

  In a state where the comparison results by the comparator 24 match (YES in step S3), the counter 25 outputs the count number after starting to input each bit of the sensor data signal to the determination circuit 27 (step S4). ). The determination circuit 27 is in the case where the count number from the counter 25 is 0 even when the output from the shift register 21 to the MPU 13 is started for the most significant bit to the least significant bit of the sensor data signal ( YES in step S5), flag information indicating no count is generated (step S9), and this flag information is stored in the shift register 21h. The stored flag information is output to the MPU 13 via the multiplexer 12b in synchronization with the host clock signal.

  When the count number from the counter 25 is not 0 (NO in step S5), the determination circuit 27 does not match the predetermined count number stored in the register 26 (YES in step S6). ), Flag information indicating the count number mismatch is generated (step S10), and the flag information is stored in the shift register 21h.

  The stored flag information is output to the MPU 13 via the multiplexer 12b in synchronization with the host clock signal. The header data comparison from step S3 to step S10, the determination of the presence / absence of the count, and the determination of the mismatch of the count numbers may be reversed.

  If the count number from the counter 25 matches the above-mentioned predetermined count number (YES in step S6), the sensors stored in the shift registers 21a, 21b, 21c,..., 21d, 21e, 21f Each bit of the data signal is shifted in the order of shift registers 21a, 21b, 21c,..., 21d, 21e, 21f, 21h in synchronization with the host clock signal, and is output to the MPU 13 as a host data signal via the multiplexer 12b. (Step S7).

  When this output is completed, the multiplexers 12a and 12b shown in FIG. 1 again select the serial data buffer 11 corresponding to one of the other sensors in synchronization with the serial clock signal at a predetermined timing from the MPU 13. . The multiplexer 12a outputs a host clock signal to the selected serial data buffer 11. After this output, the operation proceeds to S1 and later. In this way, the operations from S1 to S10 for each of the eight sensors are performed, and after one round, the operations from S1 to S10 for each sensor are performed again.

  As described above, in the displacement measuring apparatus according to the first embodiment, the sensor data signal from each sensor is sent to the serial data buffer 11 corresponding to each sensor regardless of the output timing of the sensor clock signal of the other sensor. Are stored independently. Further, after the storage, the multiplexer 12 selects the serial data buffer 11 corresponding to each sensor, and outputs the data stored in the selected serial data buffer 11 to the MPU 13 as a host data signal. Yes.

  Therefore, displacement measurement by multiple sensors whose clock signal output timings are asynchronous between the sensors is simultaneously performed, the displacement measurement result is appropriately captured in the MPU, and the displacement measurement result is recorded or printed on an electronic medium. There is an excellent effect that it can be easily realized.

  In the serial data buffer 11, not only can the data signal from each sensor be stored reliably, but the data signal output from each sensor detects an abnormal state or the sensor is not connected. It can be detected.

(Second Embodiment)
Next, a second embodiment will be described. In addition, the description of the same part as the part demonstrated in 1st Embodiment among the structures of the displacement measuring apparatus in each following embodiment is abbreviate | omitted.
In this embodiment, the shift register in the serial data buffer 11 corresponding to each sensor is provided on the sensor side and the MPU output side, respectively, and the sensor side shift register inputs the sensor data signal in synchronization with the sensor clock signal. Store.

  After storing the sensor data signal in the sensor-side shift register is completed, the stored data is loaded into the MPU-side shift register in accordance with the input of the load signal. The stored sensor data signal is output to the MPU 13 in synchronization with the host clock signal.

FIG. 4 is a diagram illustrating a configuration example in the serial data buffer of the displacement measuring apparatus according to the second embodiment.
Each of the plurality of serial data buffers 11 of the displacement measuring apparatus according to the second embodiment includes a shift register 21 on the sensor side, a header data memory 23, a comparator 24, a counter 25, a register 26, a determination circuit 27, and a shift on the MPU side. It has a register 31.

  The configuration of the shift register 21 on the sensor side is the same as that in the first embodiment. The MPU side shift register 31 has a 4-bit configuration like the sensor side shift register 21 and stores the measurement data decimal point position (BCD code) from the sensor input side to the MPU 13 output side. The shift register 31a, shift registers 31b, 31c,..., 31d, 31e for storing each digit of measurement data, and a shift register 31f for storing codes are connected in cascade. A shift register 31g is cascade-connected to the shift register 31f, and a shift register 21h is cascade-connected to the shift register 31g.

  The sensor-side shift registers 21a, 21b, 21c,..., 21d, 21e, and 21f are cascade-connected to the MPU-side shift registers 31a, 31b, 31c,.

  In the present embodiment, when the most significant bit to the least significant bit of the sensor data signal comes to a predetermined timing at which output from the shift register 21 on the sensor side to the MPU 13 should start, the MPU 13 shifts to the shift registers 31a and 31b on the MPU side. , 31c,..., 31d, 31e, 31f and the shift register 31g. This load signal loads the data stored in the shift registers 21a, 21b, 21c,..., 21d, 21e, 21f on the sensor side into the shift registers 31a, 31b, 31c, ..., 31d, 31e, 31f on the MPU side. It is a signal to do.

  As for this load signal, the multiplexer 12a inputs a serial clock signal from the MPU 13 at a predetermined timing at which the most significant bit to the least significant bit of the sensor data signal should start output from the sensor-side shift register 21 to the MPU 13. Accordingly, the multiplexer 12a may output.

  Thereby, each bit of the sensor data signal stored in the corresponding shift register 21a, 21b, 21c,..., 21d, 21e, 21f is converted into the MPU side shift register 31a, 31b, 31c, ..., 31d, 31e, 31f. Is loaded and stored.

  Thus, the sensor data signal stored in the shift register 31 on the MPU side is shifted in the order of the shift registers 31a, 31b, 31c,..., 31d, 31e, 31f, 31g in synchronization with the host clock signal. The data signal is output to the MPU 13 via the multiplexer 12b. The operations of the comparator 24 and the determination circuit 27 are the same as those in the first embodiment.

FIG. 5 is a flowchart illustrating an example of an operation procedure performed by the displacement measuring apparatus according to the second embodiment.
As an initial state, the multiplexers 12a and 12b shown in FIG. 1 select the serial data buffer 11 corresponding to one of the eight sensors according to the serial clock signal input from the MPU 13 at a predetermined timing. . The multiplexer 12a outputs a host clock signal to the selected serial data buffer 11.

  Each bit of the sensor data signal output from the selected sensor side is input to the shift register 21 in synchronization with the sensor clock signal, and the shift registers 21a, 21b, 21c,..., 21d, 21e, 21f, 21g In order, the shift is performed from the input side from the sensor toward the shift register 21 on the output side to the MPU 13 (step S21).

  When it is time to start output from the shift register 21 to the MPU 13 for the most significant bit to the least significant bit of the sensor data signal, the comparator 24 uses the header data stored in the shift register 21g and the header data memory 23. Is compared with the predetermined header data stored in (step S22). If they do not match (NO in step S23), the comparator 24 generates flag information indicating the result (step S30), and stores this flag information in the shift register 31g via the shift register 21h. To do. The stored flag information is output to the MPU 13 via the multiplexer 12b in synchronization with the host clock signal.

  In a state in which the comparison results by the comparator 24 match (YES in step S23), the counter 25 determines the count number from the start of input to the shift register 21 for each bit of the sensor data signal. (Step S24). The determination circuit 27 is a case where the count number from the counter 25 is 0 even when the output from the shift register 21 to the MPU 13 from the most significant bit to the least significant bit of the sensor data signal is to be started ( (YES in step S25), flag information indicating no count is generated (step S31), and this flag information is stored in the shift register 31g via the shift register 21h. The stored flag information is output to the MPU 13 via the multiplexer 12b in synchronization with the host clock signal.

  When the count number from the counter 25 is not 0 (NO in step S25), the determination circuit 27 does not match the predetermined count number stored in the register 26 (YES in step S26). ), Flag information indicating the count number mismatch is generated (step S32), and the flag information is stored in the shift register 31g via the shift register 21h. The stored flag information is output to the MPU 13 via the multiplexer 12b in synchronization with the host clock signal. The above-described header data comparison, count presence / absence determination, and count number mismatch determination may be performed in any order.

  When the count number from the counter 25 matches the predetermined count number stored in the register 26 (YES in step S26), the shift registers 31a, 31b, 31c,..., 31d, 31e, 31f are As the load signal is input (step S27), each bit of the sensor data signal stored in the corresponding shift register 21a, 21b, 21c,..., 21d, 21e, 21f is synchronized with the host clock signal in parallel. It is loaded and stored in the corresponding shift registers 31a, 31b, 31c, ..., 31d, 31e, 31f (step S28).

  The sensor data signals stored in the shift registers 31a, 31b, 31c,..., 31d, 31e, 31f are synchronized with the host clock signal, and the shift registers 31a, 31b, 31c,. The data are shifted in order and output to the MPU 13 as a host data signal via the multiplexer 12b (step S29).

  When this output is completed, the multiplexers 12a and 12b shown in FIG. 1 again select the serial data buffer 11 corresponding to one of the other sensors in synchronization with the serial clock signal at a predetermined timing from the MPU 13. . The multiplexer 12a outputs a host clock signal to the selected serial data buffer 11. After this output, the operation proceeds to S21 and later. In this way, the operations from S21 to S32 for each of the eight sensors are performed, and once the circuit is completed, the operations from S21 to S32 for each sensor are performed again.

  As described above, in the displacement measuring apparatus according to the second embodiment, in addition to the features described in the first embodiment, the sensor data signal stored in the sensor-side shift register 21 from the sensor is transferred to the MPU-side shift register 31. It is characterized in that it is configured to be loaded on. With such a configuration, the sensor data signal from another sensor can be stored in the shift register 21 while the sensor data signal stored in the shift register 31 is output to the MPU 13.

  In the first embodiment, in order to store a sensor data signal from another sensor in the shift register 21, it is necessary to shift each bit of the sensor data signal already stored in the shift register 21 and output it to the MPU 13. However, in this embodiment, if the sensor data signal already stored in the shift register 21 is loaded into the shift register 31 in parallel, the sensor data signal from another sensor is sent to the shift register 21. Can be stored.

  Therefore, compared with the first embodiment, the selection interval of the serial data buffer 11 corresponding to each sensor by the multiplexers 12a and 12b can be halved, so that the output of the sensor data signal from the sensor to the MPU 13 can be reduced. Throughput is improved and sensor data signals from each of a larger number of sensors can be stored in the shift register and output to the MPU 13.

(Third embodiment)
Next, a third embodiment will be described.
FIG. 6 is a diagram illustrating a configuration example in the serial data buffer of the displacement measuring apparatus according to the third embodiment.
The displacement measuring apparatus according to the third embodiment replaces the 4-bit shift registers 31a, 31b, 31c,..., 31d, 31e, 31f, and 31g described in the second embodiment with an 8-bit shift register 41a, 41b, 41c, ..., 41d, 41e, 41f, 41g. In the present embodiment, a fixed data register 42 for storing 4-bit fixed data is provided.

  The fixed data register 42 outputs 4-bit fixed data as upper 4-bit data to be stored by the shift registers 41a, 41b, 41c,..., 41d, 41e, 41f, 41g. Hereinafter, the shift registers 41a, 41b, 41c,..., 41d, 41e, 41f, and 41g are simply referred to as the shift register 41 as necessary.

  In the present embodiment, the shift register 41 loads the sensor data signal stored in the shift register 21 as lower 4 bits of data to be stored in the shift register 41. The shift register 41 loads the fixed data (0011) stored in the fixed data register 42, and uses the fixed data as upper 4 bits data to be stored in the shift register 41. A total 8-bit signal, which combines the lower 4 bits of data, is output to the MPU 13. If such an output is performed, the shift register 41 can output the output data as an ASCII character code.

FIG. 7 is a flowchart illustrating an example of an operation procedure performed by the displacement measuring apparatus according to the third embodiment.
As an initial state, the multiplexers 12a and 12b shown in FIG. 1 select the serial data buffer 11 corresponding to one of the eight sensors according to the serial clock signal input from the MPU 13 at a predetermined timing. . The multiplexer 12a outputs a host clock signal to the selected serial data buffer 11.

  Each bit of the sensor data signal output from the selected sensor side is input to the shift register 21 in synchronization with the sensor clock signal, and the shift registers 21a, 21b, 21c,..., 21d, 21e, 21f, 21g In order, the shift is performed from the input side from the sensor toward the shift register 21 on the output side to the MPU 13 (step S41).

  When it is time to start output from the shift register 21 to the MPU 13 for the most significant bit to the least significant bit of the sensor data signal, the comparator 24 uses the header data stored in the shift register 21g and the header data memory 23. Is compared with the predetermined header data stored in (step S42). If they do not match (NO in step S43), the comparator 24 generates flag information indicating the result (step S51), and sends this flag information to the shift register 41g via the shift register 21h. Store as 4-bit data.

  The 8-bit data obtained by combining the stored flag information with the fixed data stored in the fixed data register 42 as the upper 4-bit data is output to the MPU 13 via the multiplexer 12b in synchronization with the host clock signal. .

  In a state where the comparison results by the comparator 24 match (YES in step S43), the counter 25 outputs the count number from the start of input of each bit of the sensor data signal to the determination circuit 27 (step S44). ). The determination circuit 27 is in the case where the count number from the counter 25 is 0 even when the output from the shift register 21 to the MPU 13 is started for the most significant bit to the least significant bit of the sensor data signal ( (YES in step S45), flag information indicating no count is generated (step S52), and this flag information is stored as data of lower 4 bits in the shift register 41g via the shift register 21h.

  The 8-bit data obtained by combining the stored flag information with the fixed data stored in the fixed data register 42 as the upper 4-bit data is output to the MPU 13 via the multiplexer 12b in synchronization with the host clock signal. .

  If the count number from the counter 25 is not 0 (NO in step S45), the determination circuit 27 does not match the predetermined count number stored in the register 26 (YES in step S46). ), Flag information indicating the count number mismatch is generated (step S53), and the flag information is stored as data of lower 4 bits in the shift register 41g via the shift register 21h.

  The 8-bit data obtained by combining the stored flag information with the fixed data stored in the fixed data register 42 as the upper 4-bit data is output to the MPU 13 via the multiplexer 12b in synchronization with the host clock signal. . The above-described header data comparison, count presence / absence determination, and count number mismatch determination may be performed in any order.

  If the count number from the counter 25 is equal to the predetermined count number (YES in step S46), the shift registers 41a, 41b, 41c,..., 41d, 41e, 41f receive load signals. At the same time (step S47), each bit of the sensor data signal stored in the corresponding shift register 21a, 21b, 21c,..., 21d, 21e, 21f is loaded in parallel in synchronization with the host clock signal. The data is stored in the shift registers 41a, 41b, 41c,..., 41d, 41e, 41f as lower 4 bits data (step S48).

  .., 21d, 21e, 21f to shift registers 41a, 41b, 41c,..., 41d, 41e, 41f and lower 4 bits of data and fixed data stored in the fixed data register 42. The 8-bit data that is combined with the higher-order 4-bit data is shifted in the order of the shift registers 41a, 41b, 41c,..., 41d, 41e, 41f, and 41g in synchronization with the host clock signal. The data is output to the MPU 13 via 12b (step S49).

  When this output is completed, the multiplexers 12a and 12b shown in FIG. 1 again select the serial data buffer 11 corresponding to one of the other sensors in synchronization with the serial clock signal at a predetermined timing from the MPU 13. . The multiplexer 12a outputs a host clock signal to the selected serial data buffer 11. After this output, the operation proceeds to S41 and later. In this way, the operations from S41 to S53 for each of the eight sensors are performed, and after one round, the operations from S41 to S53 for each sensor are performed again.

  As described above, in the displacement measuring apparatus according to the third embodiment, in addition to the features described in the second embodiment, the shift register 41 on the MPU side shifts the sensor data signal stored in the shift register 21. The data is loaded as the lower 4 bits of the register 41. The shift register 41 loads the fixed data stored in the fixed data register 42 and outputs an 8-bit signal obtained by combining the fixed data to the MPU 13. When such an output is performed, the output data can be output as an ASCII character code, and the ASCII character code can be set when the data is output to the MPU.

  As a result, data writing from the MPU 13 to the memory card 15 and output to the serial printer 14 can be processed at a higher speed than in the prior art when operated by software processing in the MPU 13, so that a larger number of data can be processed. Displacement measurement with a sensor connected is possible.

According to each of these embodiments, it is possible to provide a displacement measuring device that can input and appropriately output displacement data signals from each of a plurality of displacement sensors.
Although several embodiments of the invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 11 ... Serial data buffer, 12, 22, 104 ... Multiplexer, 13, 105 ... MPU, 14 ... Serial printer, 15 ... Memory card, 21, 31, 41, 111 ... Shift register, 23 ... Header data memory, 24 ... Comparison 25, counter, 26, register, 27, determination circuit, 42, fixed data register.

Claims (7)

Provided corresponding to each of the plurality of displacement sensors, the displacement data signal output from each of the displacement sensors is input as serial data in synchronization with the clock signal from the displacement sensor from which the displacement data signal is output. A temporary storage device for temporary storage;
Output means for sequentially selecting any one of the temporary storage devices and outputting the displacement data signal stored in the selected temporary storage device as serial data in synchronization with a predetermined clock signal; Displacement measuring device. The temporary storage device is:
The displacement data signal from the displacement sensor is provided in accordance with the number of bits of the displacement data signal to be temporarily stored as serial data in synchronization with a clock signal from the displacement sensor that is the output source of the displacement data signal. A first shift register;
A second shift register provided in accordance with the number of bits of the displacement data signal to read out and temporarily store the displacement data signal temporarily stored in the first shift register;
The output means includes
The displacement measuring device according to claim 1, wherein the displacement data signal stored in the second shift register of the selected temporary storage device is output as serial data in synchronization with the predetermined clock signal. The temporary storage device is:
The displacement data signal from the displacement sensor is provided in accordance with the number of bits of the displacement data signal to be temporarily stored as serial data in synchronization with a clock signal from the displacement sensor that is the output source of the displacement data signal. A first shift register;
A second shift register provided according to the number of bits of the displacement data signal to read out and temporarily store the displacement data signal temporarily stored in the first shift register;
Data storage means for storing data of a predetermined number of bits of a predetermined value,
The output means includes
Data with the displacement data signal stored in the second shift register of the selected temporary storage device as the lower bits of serial data and the data stored in the data storage means as the upper bits of the serial data The displacement measuring device according to claim 1, wherein the data is output as serial data. The temporary storage device is:
2. The displacement measuring apparatus according to claim 1, wherein when the clock signal from the displacement sensor is not input, a signal indicating that the output state of the clock signal from the displacement sensor is abnormal is output. . The temporary storage device is:
The signal indicating that the output state of the displacement data signal from the displacement sensor is abnormal is output when the header information indicated by the displacement data signal from the displacement sensor is not normal. The displacement measuring device described. The temporary storage device is:
Even when the most significant bit to the least significant bit of the displacement data signal from the displacement sensor is input, when the number of clock signals input from the displacement sensor does not satisfy a predetermined condition, the signal from the displacement sensor The displacement measuring apparatus according to claim 1, wherein a signal indicating that the output state is abnormal is output. In a temporary storage device provided corresponding to each of the plurality of displacement sensors, the displacement data signal output from each of the displacement sensors is serialized in synchronization with the clock signal from the displacement sensor from which the displacement data signal is output. As a temporary save,
One of the temporary storage devices is sequentially selected, and a displacement data signal stored in the selected temporary storage device is output as serial data in synchronization with a predetermined clock signal.

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