JP3364582B2 - Failure detection system - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a plurality of relay units to which one or a plurality of measurement gauges can be connected, and arithmetic processing means for collecting and processing measurement data from these relay units. The present invention relates to a failure detection system for a measurement data processing device that is connected in series with adjacent front and rear relay units via a cable.

[0002]

BACKGROUND ART In order to perform multipoint simultaneous measurement on a workpiece using a measurement gauge, a plurality of relay units to which one or a plurality of measurement gauges can be connected and measurement data from these relay units are collected and processed. There is known a measurement data processing apparatus including an arithmetic processing unit. As such a measurement data processing device, each relay unit is connected in series with the adjacent front and rear relay units via a cable, and the relay unit arranged at the end of the row is a processing unit and an RS232C cable. Are connected by.

The measurement data converted into an electric signal by the measurement gauge is transmitted from a relay unit to which the measurement gauge is connected, transmitted via a relay unit arranged in the preceding stage and a cable, and arranged at the end. It is transmitted from the relay unit to the arithmetic processing means through the RS232C cable. According to such a measurement data processing apparatus, since the relay units are connected in series with each other and one of the relay units is connected with the arithmetic processing means,
When adding a measurement gauge, connect a new relay unit in series to the relay unit group that is connected in series with each other, and connect the measurement gauge to this new relay unit so that the measurement gauge can be easily added and expanded. It is possible to construct a processing device for highly accurate measurement data.

[0004]

However, in the above-mentioned measurement data processing apparatus, all the relay units are not connected to the arithmetic processing means in a one-to-one correspondence, so that some of the relay units may fail. When a cable such as a wire breakage occurs in a cable connecting two adjacent relay units, there is a problem that it is difficult for the arithmetic processing unit to immediately identify the failure location.

An object of the present invention is to provide a plurality of relay units to which one or a plurality of measurement gauges can be connected, and arithmetic processing means for collecting and processing the measurement data from these relay units, and the relay units are adjacent to each other. Provided is a failure detection system capable of immediately identifying a failure location when a failure occurs in the measurement data processing device in a measurement data processing device connected in series with a relay unit in the front and rear stages via a cable. To do.

[0006]

A failure detection system according to the present invention comprises a plurality of relay units to which one or a plurality of measurement gauges can be connected, and an arithmetic processing unit for collecting and processing measurement data from these relay units. A failure detection system for a measurement data processing device in which each relay unit is connected in series with adjacent front and rear relay units through a cable, wherein the measurement data processing device is:
A measurement data line and a command data line connecting the relay units in parallel to the arithmetic processing means;
Each of the relay units is connected to the adjacent relay units, and with a transmission line that sequentially transmits a transmission completion signal in which the signal value is switched to the relay unit in the subsequent stage when the transmission of the measurement data of the relay unit in the previous stage is completed, Is the above
When waiting for an instruction from the arithmetic processing means, the measurement data
When the transmission completion signal indicating that the data has been transmitted is received, the relay user
The difference in the cable between the relay unit in the front stage of the knit or between them
It is characterized in that a transmission line abnormality detecting means for constantly detecting is provided.

Here, the above-mentioned transmission completion signal is, in short, an alternative signal such as a digital signal of 0 or 1, and it is conceivable, for example, to output two kinds of high and low voltages.
That is, specifically, when each relay unit has not yet transmitted the measurement data, the low voltage output signal value (Low) is output to the adjacent relay unit in the subsequent stage, and after the measurement data is transmitted, the high voltage output is obtained. It becomes a signal value (High). Further, the above-mentioned transmission line abnormality detecting means receives the signal value (Low or High) of the transmission completion signal transmitted from such a relay unit at the preceding stage, and detects the signal value (Low or High) of the preceding stage in accordance with the operating state of the measurement data processing device. It is to detect whether there is an abnormality in the relay unit or the cable.
Therefore, the transmission line abnormality detection means detects that the transmission completion signal is abnormal according to the operating state of the capturing unit that receives the transmission completion signal, the storage unit that stores the captured transmission completion signal, and the measurement data processing device. It is necessary to have a determination unit that determines whether or not there is.

According to the present invention, since each relay unit is provided with the transmission line abnormality detecting means, when an abnormality occurs in the preceding relay unit or the cable, the adjacent succeeding relay unit detects the abnormality. It is possible to detect and immediately identify the failure location of the processing device for the measurement data. In this case, it is preferable that the transmission line abnormality detecting means is provided with an error signal output section for transmitting the abnormality to the arithmetic processing means via the above-mentioned measurement data line. That is, since the error signal output section is provided, the abnormality of the relay unit described above can be transmitted to the arithmetic processing means, and it becomes possible to easily identify the failure location on the arithmetic processing means.

In the above, the transmission identification in which the signal value is switched on condition that the measurement data processing device connects the relay units in parallel to the arithmetic processing means and the measurement data is transmitted from all the relay units. When the data transmission identification line through which the signal is transmitted is provided, each relay unit described above is connected to the measurement data from the relay unit.
Data is transmitted, another relay unit is
Sends all measurement data despite being connected
When the transmission identification signal indicating the reception is received, the relay unit at the latter stage is received.
Preferably, the identification line abnormality detecting means for detecting a cable abnormality between the knit is provided.

Here, the identification line abnormality detecting means is similar to the above-mentioned transmission line abnormality detecting means, and is a capturing section, a storage section,
It is necessary to provide a judgment unit, and preferably an error signal output unit. Specifically, the determination by the transmission line abnormality detection means and the identification line abnormality detection means described above is determined as follows according to the signal values (Low, High) of the transmission completion signal and the transmission identification signal described above. . When each relay unit waits for a command from the arithmetic processing means, a transmission completion signal (High) indicating that the transmission line abnormality detecting means of a certain relay unit has transmitted the measurement data.
When h) is detected, the abnormality detecting unit of the relay unit determines that the relay unit or the cable in the preceding stage has an abnormality.

When the measurement data is transmitted from the relay unit in the preceding stage, if the discrimination line abnormality detecting means of the relay unit in the preceding stage detects a transmission identification signal (High) indicating that all the measurement data is transmitted, the identification is performed. The line abnormality means determines that there is an abnormality in another relay unit or cable in the subsequent stage. From the results of the above, the arithmetic processing means determines that the cable is in failure. On the other hand, if the result of is not abnormal,
Identify the failure of the relay unit at the previous stage.

According to such a failure detection system, since the failure detection system includes the transmission line abnormality detection means and the identification line abnormality detection means, the failure location of the measurement data processing device can be reliably identified as described above. It becomes possible to do. Further, since the transmission line abnormality detecting means and the identification line abnormality detecting means are provided with the error signal output section, the above discrimination can be automatically carried out by the arithmetic processing means such as a personal computer, and the measurement data processing device is easy to use. Will be even better.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a measurement data processing apparatus 1 according to an embodiment of the present invention. The measurement data processing apparatus 1 performs the multipoint simultaneous measurement,
The digital dial gauges 10 serving as six measuring gauges are provided, and the personal computer 60 serving as an arithmetic processing unit can collectively collect and process the measurement data from the six digital dial gauges 10. A plurality of relay units 20M, 20S, 40S connected in series are interposed between the digital dial gauge 10 and the personal computer 60, and the plurality of relay units 20M, 20S, 40S are provided.
Is located at the end of the relay unit group, and the personal computer 6
0 and the master unit 20M connected via the RS232C cable 72, and the slave units 20S and 40S sequentially connected behind the master unit 20M.
It consists of and.

The master unit 20M and the slave unit 20S differ only in the connection state of the cable 71 and the RS232C cable 72, and the internal structural specifications of these units 20M and 20S are the same. Further, the slave unit 20S and the slave unit 40S are different in that the number of digital dial gauges 10 that can be connected per unit is different. The slave unit 20S includes one digital dial gauge 10 and the slave unit 40S includes a digital dial gauge 10. Two dial gauges 10 can be connected.

The digital dial gauge 10 includes a main body 11
And a spindle 1 slidably provided on the main body 11.
2 and the inside of the main body 11 accommodates a detection means composed of a fixed-side detection element fixed to the main body 11 and a movable-side detection element that moves in the same direction in synchronization with sliding of the spindle. Has been done. Then, the relative displacement amount of the main body 11 and the spindle 12 is converted into an electric signal by this detection means, transmitted to the relay units 20M, 20S, 40S by the connection cable 13, and further transmitted through the cable 71 and the RS232C cable 72 to the personal computer. 60
Sent to.

Each relay unit 20M, 20S, 40
In S, the address data is set by adding the number of self-measuring gauges based on the address data from the relay unit 20M in the previous stage, and this address data is set in the relay unit 2 in the subsequent stage.
Address transmitting means for transmitting to 0S and 40S is provided. And all the relay units 20M, 20S, 4
When the power of 0S is turned on, the address data of all the digital dial gauges 10 are set and transmitted to the personal computer 60, and the personal computer 60 then sets the digital dial gauge 10
Is configured to secure a recording area according to the address data of.

As shown in FIG. 2, the cable 71 is provided with a plurality of transmission / reception lines, and a command data line 711 and a measurement data line 712 for connecting the relay units 20M, 20S, 40S to the personal computer 60 in parallel. , Data transmission identification line 713 and master unit 20M
And a transmission line 714 that connects between the slave units 40S and between two adjacent slave units 20S and 40S. Also, a personal computer 60
RS232 that connects between the master unit and the master unit 20M
The control line 721 and the detection line 7 are also included in the C cable 72.
22 is provided.

The instruction data line 711 is RS232C.
PC 60 via control line 721 of cable 72
Command C1 to be a control signal from each relay unit 20
PC, which is to be distributed to M, 20S, and 40S.
By sending a command C1 from 0, the measurement data S1 of the digital dial gauge 10 (not shown in FIG. 2) connected to each of the relay units 20M, 20S, 40S is transmitted, and zero point adjustment, span adjustment, etc. are performed. be able to. The measurement data line 712 is a line for transmitting the measurement data S1 which is a measurement value transmitted from each digital dial gauge 10 to the personal computer 60 via each relay unit 20M, 20S, 40S.

The data transmission identification line 713 is transmitted from the relay units 20M, 20S, 40S to the personal computer 60 when all the measurement data S1 from the digital dial gauge 10 connected to itself is transmitted through the measurement data line 712. It is a line for transmitting the identification signal S3. The transmission identification signal S3 is an alternative signal indicating whether or not the measurement data S1 has been transmitted, and is a voltage output signal of two types, high and low. That is, when the measurement data S1 is being transmitted, the transmission identification signal S3 has a low voltage output signal value (hereinafter,
Low), and when the measurement data S1 is not transmitted, the transmission identification signal S3 has a high voltage output signal value (hereinafter,
High).

The data transmission identification line 713 is a wired OR, and all the relay units 20M, 20S,
When the transmission identification signal S3 from 40S becomes High, the personal computer 60 and each relay unit 20M, 20S, 40
Transmission identification signal END indicating that all data has been transmitted to S
Is configured to deliver. That is, when any of the plurality of relay units 20M, 20S, 40S is transmitting the measurement data S1 and the transmission identification signal S3 is Low, the transmission identification signal END becomes Low, and all the measurement data S1 are transmitted. Is completed, the transmission identification signal E
ND becomes High.

The transmission line 714 is, for example, in the relationship between the master unit 20M and the slave unit 20S connected to the subsequent stage, when all the measurement data S1 is transmitted from the relay unit 20M in the previous stage, the relay line in the subsequent stage is transmitted. This is a line for sending the transmission completion signal S2 to the unit 40S. Similar to the transmission identification signal S3 described above, the transmission completion signal S2 is also an alternative voltage output signal indicating whether or not the transmission is completed, and in the state where the self does not yet transmit the measurement data S1, the relay of the previous stage is performed. The unit 20M uses the transmission completion signal S2
Is transmitted to the relay unit 40S in the subsequent stage as the Low, and the transmission completion signal S2 is set to H after the measurement data S1 is transmitted.
Send it as high.

As described above, the signal values of the transmission completion signal S2, the transmission identification signal S3, and END change according to the transmission state of the measurement data S1 of the master unit 20M and slave units 20S and 40S. Is as shown in Table 1.

[0023]

[Table 1]

Relay unit (master unit) 20M
Has a rectangular parallelepiped outer case, and as shown in FIG. 3 (A), is connected to the front side of the outer case with a display unit 21 capable of displaying an 8-digit number by a light emitting diode. Digital dial gauge 10 relay unit 2
0M, and a touch key panel 22 for individually performing zero adjustment and limit adjustment are provided. Relay unit 2
On the back side of 0M, as shown in FIG. 3B, an RS link input that connects a gauge input connector 23 that connects the connection cable 13 and a cable 71 that connects the relay units 20M, 20S, 40S to each other. A terminal 24, an RS link output terminal 25, an RS232C connector 26 to which the RS232C cable 72 is connected, a DC adapter connection terminal 27, and a power switch 28 are provided. The relay unit 20M is provided with an external output terminal 29 composed of a half 36-pin connector for connecting a printer in order to directly print the measurement data.

The inside of such a relay unit 20M is
The gauge input connector 23 having the structure shown in the circuit schematic diagram of FIG. 4 and connected to the connection cable 13 is connected to the RS232C connector 26, the RS link input terminal 24, and the RS link output terminal 25 via the microcomputer 31. Has been done. The RS link input terminal 24 and the RS link output terminal 25 are connected to the RS232C connector 26 and the wiring 24.
Signals input and output to and from the RS232C connector are connected to the RS link input terminal 24 and the RS link output terminal 25 without passing through the microcomputer 31 inside the relay unit 20M.

The microcomputer 31 receives the measurement data S1 from the digital dial gauge 10 and records it in the memory 3.
11 and measurement data S1 recorded in this memory 311
A serial interface 312 for directly transmitting the data to the personal computer 60 via the RS232C cable 72,
An arithmetic unit (not shown in FIG. 4) for controlling and managing the measurement data S1 held in the memory 311 is provided. The serial interface 312 and the RS232C connector 2
An RS232C driver 32 for converting an electric signal output from the microcomputer 31 is interposed between the RS6 and the driver 6.

The RS link output terminal 2 is provided in the microcomputer 31.
A 5-state buffer 33 is provided for transmitting the measurement data from 5, and the output of the 3-state buffer 33 is connected to the RS link output terminal 25 by the wiring 331. Also, serial interface 312 and R
A selector 38 for switching between the data signal and the address signal from the personal computer 60 is provided between the S232C driver 32 and the S232C driver 32. Then, between the microcomputer 31 and the gauge input connector 23, an input filter 3 for removing noise, which is the measurement data S1 transmitted from the digital dial gauge 10, and performing pulse conversion of the electric signal.
4, a counting circuit 35 is provided.

The microcomputer 31 is provided with a first circuit 36 for inputting and outputting the transmission completion signal S2 to the microcomputer 31, and a second circuit 37 for inputting and outputting the transmission identification signal S3 to the microcomputer 31. . The first circuit 36 is the input side wiring 3 that connects the RS link input terminal 24 and the microcomputer 31.
61, and an output side wiring 362 connecting the microcomputer 31 and the RS link output terminal 25, each wiring 361,
An inverter 363 for inversely converting an input / output electric signal is provided in the middle portion of 362, and a resistor 364 for applying a voltage to the inverter 363 is further provided in the middle portion of the input side wiring 361. .

The second circuit 37 has an RS link input terminal 24.
Wiring 371 for connecting the RS link output terminal 25 with the
And a second wiring 372 branched from the first wiring 371 to input the transmission identification signal END to the microcomputer 31, and a transmission identification signal S3 output from the microcomputer 31 to the first wiring.
The third wiring 373 for outputting to the wiring 371 and the second wiring 37
2 has a resistor 374 for applying a constant voltage to the first wiring 371 when there is no signal output, and an inverter 375 is interposed in the second wiring 372 and the third wiring 373. The second wiring 372 is provided to monitor the states of the other relay units 20S and 40S by the transmission identification signal END of the data transmission identification line 713.

In such a relay unit 20M,
The transmission line abnormality detecting means is composed of a first circuit 36 that inputs and outputs the transmission completion signal S2, and an arithmetic unit of the microcomputer 31 that determines whether or not there is an abnormality based on the input signal value to the first circuit 36. To be done. The identification line abnormality detecting means includes a second circuit 37 that inputs and outputs the transmission identification signal S3, and a computing unit of the microcomputer 31 that determines whether or not there is an abnormality based on the input signal value to the second circuit 37. Composed of.

The transmission line abnormality detecting means and the identification line abnormality detecting means described above are provided with an error signal output section for transmitting an error signal to the outside according to the failure detection state. It is composed of a 3-state buffer 33 connected to 712. Incidentally, FIG.
Although not shown in the figure, the error signal is transmitted to the relay unit 20M.
Is also configured to be output to the display unit 21 on the front face of the device, and when a failure occurs, an error message is displayed on the display unit.

In the case of the relay unit 40S capable of connecting two digital dial gauges 10, the relay unit 20
Although it has substantially the same structure as the internal structure of M, since two gauge input connectors 23 are provided, an input filter 34 and a counting circuit 35 are additionally provided accordingly. Further, in the relay unit 40S, the memory 311 on the microcomputer 31 is also divided into two storage areas, and the measurement data S1 of the digital dial gauge 10 is held in each storage area.

Next, the flow of various electric signals in the relay units 20M and 20S will be described. Flow of measurement data The measurement data S1 transmitted from the digital dial gauge 10 is supplied from the connection cable 13 to the gauge input connector 23.
To the memory 311 on the microcomputer 31 via the input filter 34 and the counting circuit 35.
When the microcomputer 31 determines that a transmission completion signal S2, which will be described later, has been input, the measurement data S1 is output from the 3-state buffer 33 and is output from the RS link output terminal 25 or the RS232C connector 26 to the outside of the device by the wiring 331. It

Flow of Transmission Complete Signal The transmission complete signal S2 is transmitted from the RS link input terminal 24 to the first
Input side wiring 361 and inverter 36 forming the circuit 36
3 is sent to the microcomputer 31. Transmission completion signal S2
The microcomputer 31 which recognizes that the signal value of is High (initial applied voltage Vcc) outputs the measurement data S1 from the 3-state buffer 33. Then, after the transmission of the self measurement data S1 is completed, the relay unit 20 in the subsequent stage is
In order to inform the S and 40S that the transmission is completed, the transmission completion signal S2 is sent by the microcomputer 31 and the inverter 363.
The signal value of is switched to High, and the transmission completion signal S2 is transmitted from the RS link output terminal 25.

Flow of Transmission Identification Signal The transmission identification signal S3 is transmitted from the RS link input terminal 24 to the second
A first wiring 371, a second wiring 372, which form the circuit 37,
It is sent to the microcomputer 31 via the inverter 375.
After the transmission of the self measurement data S1 is completed in the same manner as described above, the microcomputer 31 sets the signal value of the transmission identification signal S3 to High.
switching to h, the inverter 375, the third wiring 373,
The transmission identification signal S3 is transmitted from the RS link output terminal 25 via the first wiring 371. When all the transmission identification signals S3 are output, this data transmission identification line 7
The transmission identification signal END is distributed from 13 to the personal computer 60 and each relay unit 20M, 20S, 40S.

The procedure for collecting the measurement data S1 in the measurement data processing apparatus 1 as described above will be described below. From the personal computer 60 to each relay unit 20M, 20S,
The command C1 for setting the measurement condition of 40S is distributed to all the relay units 20M, 20S, 40S. Each relay unit 20M, 2 based on the command C1
When the zero adjustment and the span adjustment of 0S and 40S are completed, each relay unit 20M, 20S and 40S is connected to the personal computer 60.
Then, a signal indicating that the initial setting is completed is transmitted to the personal computer 60. After declaring the measurement start by the personal computer 60, the master unit 20M transmits the measurement data S1 of the digital dial gauge 10 to the personal computer 60. Then, the transmission completion signal S is transmitted through the transmission line 714.
2 is transmitted as High to the slave unit 40S in the subsequent stage, and the transmission identification signal S3 is transmitted as High on the data transmission identification line 713.

When the slave unit 40S receives the transmission completion signal S2, the slave unit 40S concerned
Starts measurement and transmits the measurement data S1 to the personal computer 60. Hereinafter, by repeating the operation of, the slave unit 4 arranged at the end from the master unit 20M.
The measurement data S1 is sequentially transmitted to the personal computer 60 until 0S. When all the measurement data S1 have been transmitted, the entire transmission identification signal END of the data transmission identification line 713 is set to High.
PC 60 for each relay unit 2 as h (end of measurement)
Send to 0M, 20S, 40S. When the personal computer 60 recognizes from the transmission identification signal END that the measurement is completed, the setting of the entire measurement data processing device 1 is returned to the initial state.

Next, the failure detection procedure of the above-described measurement data processing device 1 will be described with reference to FIG. Figure 5
When the cable 71 between the second-stage slave unit 40S and the third-stage slave unit 20S shown in (A) is broken, the transmission completion signal S2 input to and output from the third-stage slave unit 20S. , Transmission identification signal S3, EN
D is in the state shown in Table 2.

[0039]

[Table 2]

That is, the transmission line abnormality detecting means of the slave unit 20S confirms that the signal value of the transmission completion signal S2 on the input side should be High although it should normally be Low in the state of waiting for a command from the personal computer. It is detected and an error signal is output to another device such as the personal computer 60. This means that the power supply of the slave unit 40S in the preceding stage is off and the transmission completion signal S2 is not output,
This means that the transmission line 714 of the cable 71 connecting these is broken.

After the transmission of the measurement data S1 of the slave unit 40S in the preceding stage is completed, the identification line abnormality detecting means of this slave unit 40S is provided in the succeeding stage in the slave unit 20S.
Transmission identification signal EN even though S is connected
It detects that D is High and outputs an error signal to another device such as the personal computer 60. This means that the measurement data S1 is transmitted from all of the relay units recognized by the data transmission identification line 713, which means that the data transmission identification line 713 is closed at this stage. In the personal computer 60, it is determined based on the results of the transmission line abnormality detection means and the identification line abnormality detection means that the cable 71 connecting the slave unit 20S in the second stage has a failure, and the display is displayed. Etc.

On the other hand, when the power supply of the second-stage slave unit 40S is turned off, as shown in FIG. 5B, the transmission line detecting means of the third-stage slave unit 20S receives the input signal as described above. The transmission completion signal S2 on the side detects that it is High, but the identification line abnormality detecting means does not detect an abnormality. Therefore, it is determined that the personal computer 60 has a fault other than the above-described cable disconnection, and that the power supply of the slave unit 40S at the preceding stage is turned off, or a fault corresponding to the fault has occurred.

The personal computer 60 and the master unit 20
The disconnection of the RS232C cable 72 between M and M can be directly recognized on the personal computer 60 side, and it is not necessary to use the above-described failure detection system. In addition, regarding the disconnection of the command data line 711 and the measurement data line 712, since the personal computer 60 and each of the relay units 20M, 20S, 40S are connected in parallel, and the connection status can be individually confirmed from the personal computer 60 side, There is no need to utilize the failure detection system described above.

According to the above embodiment, the following effects can be obtained. That is, each relay unit 20M, 20
Since S and 40S are provided with the transmission line abnormality detecting means, when an abnormality occurs in the relay unit 40S in the preceding stage or the cable 71, the adjacent relay unit 20S in the subsequent stage detects the abnormality and the measurement data processing device. The failure point of 1 can be specified immediately.

Further, since the failure detection system includes the transmission line abnormality detection means and the identification line abnormality detection means,
It is possible to reliably identify whether the relay unit 40S at the preceding stage has a failure or the cable 71 has a disconnection failure. Further, since the transmission line abnormality detecting means and the identification line abnormality detecting means are provided with the error signal output portion, the failure of the measurement data processing device 1 can be concentratedly detected by the personal computer 60.

The present invention is not limited to the above-described embodiment, but includes the following modifications. That is, the transmission completion signal S2 and the transmission identification signal S3 described above are voltage output signals composed of Low and High, but the present invention is not limited to this, and may be current output signals, and further, they are not digital signals. Good. In short, any signal can be used as long as it can determine whether or not the measurement data S1 is transmitted. Further, in the above-described embodiment, only three slave units 20S and 40S are connected in series, but the present invention is not limited to this, and more slave units may be connected.

Furthermore, in the above-described embodiment, the relay units 20M, 20S, 40S are connectable with one or two digital dial gauges 10, but the number of digital dial gauges is not limited to this. A relay unit to which 10 can be connected may be adopted. In short, the digital dial gauge 10 provided in the measurement data processing device
The number of units may be appropriately determined according to the setting of the recording area that can be secured on the personal computer 60. Further, in the above-described embodiment, the measurement data S1 is obtained by converting the sliding displacement amount of the spindle 12 into an electric signal, but the present invention is not limited to this, and the strain for converting the mechanical strain amount of the object into an electric signal. For the gauge, the measurement data processing device according to the present invention may be adopted. In addition, the specific structure, shape, and the like when implementing the present invention may be other structures and the like as long as the object of the present invention can be achieved.

[0048]

According to the failure detection system as described above, a plurality of relay units to which one or a plurality of measurement gauges can be connected and an arithmetic processing means for collecting and processing measurement data from these relay units are provided. In a measurement data processing device in which each relay unit is connected in series with an adjacent front-stage and rear-stage relay unit via a cable, each relay unit is equipped with a transmission line abnormality detecting means, so that the measurement data is processed. Even if a failure occurs in the device, the failure location can be immediately identified.

[Brief description of drawings]

FIG. 1 is a schematic diagram illustrating a measurement data processing device according to an embodiment of the present invention.

FIG. 2 is a schematic diagram showing a connection line between the arithmetic processing unit and the relay unit in the above embodiment.

FIG. 3 is a front view and a rear view showing an external appearance of the relay unit in the above-described embodiment.

FIG. 4 is a schematic diagram showing an internal structure of a relay unit in the above-described embodiment.

FIG. 5 is a schematic diagram showing a failure situation of a measurement data processing device in the above-described embodiment.

[Explanation of symbols]

10 measuring gauge 20M, 20S, 40S relay unit 60 arithmetic processing means 71 cable 711 Command data line 712 Measurement data line 713 Data transmission identification line 714 transmission line S1 measurement data S2 transmission completion signal S3 transmission identification signal

Continuation of the front page (56) Reference JP-A-175098 (JP, A) JP-A-1-169696 (JP, A) JP-A-63-73799 (JP, A) (58) Fields investigated (Int .Cl. ⁷ , DB name) G01B 21/00 G01D 21/00 G08C 13/00-25/04

Claims (3)

(57) [Claims] 1. A plurality of relay units to which one or a plurality of measurement gauges can be connected, and arithmetic processing means for collecting and processing the measurement data from these relay units, wherein each relay unit has a front stage and a rear stage adjacent thereto. A failure detection system for a measurement data processing device connected in series with a relay unit via a cable, wherein the measurement data processing device is a measurement device that connects the relay units in parallel to the arithmetic processing means. A data line and a command data line are connected between the adjacent relay units, and a transmission line that sequentially transmits a transmission completion signal for switching the signal value to the relay unit in the subsequent stage when the transmission of the measurement data of the relay unit in the previous stage is completed. Each of the relay units has a command from the arithmetic processing means.
When in the waiting state, the transmission completion of the
When the end signal is received, the relay unit in the preceding stage of the relay unit is
And a transmission line abnormality detecting means for detecting abnormality of a cable between them. 2. The failure detection system according to claim 1, wherein the relay units are connected in parallel to the arithmetic processing unit, and the measurement data is transmitted from all the relay units. A data transmission identification line for transmitting a transmission identification signal whose value is switched is provided, and each relay unit has a measurement data from the relay unit.
Data is transmitted, another relay unit is
Sends all measurement data despite being connected
When the transmission identification signal indicating the reception is received, the relay unit at the latter stage is received.
A failure detection system, characterized in that an identification line abnormality detection means for detecting an abnormality of a cable between the knit and the knit is provided. 3. The failure detection system according to claim 2, wherein the transmission line abnormality detection means and the identification line abnormality.
When the detecting means detects an abnormality, it causes the arithmetic processing means to error.
Output signal, the arithmetic processing means and the transmission line abnormality detecting means.
And the error signal from the identification line abnormality detection means
A failure detection system characterized by determining the failure location .