JPS613204A - Limit switch type position detector suitable for flexible manufacturing system - Google Patents

Abstract

PURPOSE:To provide the system with responsiveness and versatility by using an absolute position detector and providing this detector with a program regarding on-off switch positions of various control operations, and outputting them at a request from a controller side. CONSTITUTION:The limit switch type position detector consists of an absolute position detecting means 1, setting means 2, storage means 3, readout means 4, data converting means 5, and on-off signal generating means 6 and generates and supplies a signal for a specific position corresponding to the movement of a machine system to a controller such as a sequencer. Then, an optional program set by said setting means 2 is stored in a storage means 3 and on-off switch position setting data on control operation corresponding to a program specified with a program specifying signal are read out of said storage means 3. Said generating means 6 generate on-off signals corresponding to various control operations on the basis of said read data and current position data obtained by converting the output of said detecting means 1 through data conversion 5.

Description

[Detailed description of the invention] [Industrial application field] This invention is a flexible manufacturing system (commonly known as FMS).
The present invention relates to a position detection device suitable for, for example, a limit switch type position detection device that can generate a position signal in response to an arbitrary position or range programmed for positioning control of various machines.

[Conventional technology and problems]

The conventional method for obtaining position signals corresponding to arbitrary machine movement positions for the purpose of positioning control of various machines, etc. is to install a striker (dog) on the side of the moving machine. The KIJ limit switch is placed at any desired position along the range, and when the machine reaches that position, the striker activates the limit switch to produce an on/off output.

By the way, recently, there has been a rapid response to the diversification of manufactured items.
A flexible manufacturing system (FMS) has been proposed for this purpose, but this system allows for the freedom and rapid rearrangement of each manufacturing station when the manufactured item changes.
In addition, it must be possible to synchronize all stations immediately. With this in mind, each manufacturing station must consist of reliable terminal equipment with individual intelligence capabilities.
So-called sag contract type (5ubcontract)
or: a lower-level device that operates according to instructions from a higher-level device), but rather a vendor-type device (vendor: a device that includes functions that can operate independently based on self-determination).

However, position detection devices using mechanical limit switches as described above are troublesome to change the operating position, difficult to obtain high-precision position signals, have limited durability and reliability, and require complete subcontrollers. Because it is a tractor-type device and has no intelligence function, it is completely unsuitable for flexible production systems.

The present invention has been made in view of the above-mentioned points, and it is an object of the present invention to provide a limit switch type position detection device having an intelligence function suitable for a flexible production system.

[Means for solving problems]

The limit switch type position detection device according to the present invention generates a signal corresponding to a predetermined position or range according to the movement of the mechanical system when the mechanical system is controlled by a control device such as a sequencer or an NC (numerically controlled) control roller. It is generated and given to the control device, and is used as a position detection element in 1. An absolute position detection means is used that can generate a position detection signal absolutely (in an absolute address format) over the entire movement range of the mechanical system. Furthermore, the present invention further provides a setting means that allows the on/off switching positions of multiple types of control operations to be arbitrarily set in an absolute manner for one program, and such settings can be made independently for each of the multiple programs; A storage means is provided for storing on/off switching position data of the plurality of types of control operations for each program set by the means. A program designation signal designating any one of the plurality of programs is applied from the control device, and the reading device selectively reads the program designated by the program designation signal from the storage device. enable. On the other hand, data conversion means is provided for converting the data representation of the absolute position detection signal output from the absolute position detection means in accordance with parameters corresponding to the mechanical system. Further, an on/off signal forming means is provided, and the means for forming an on/off signal is provided to output a signal between each set position regarding one program selectively read out from the storage means and the current position of the mechanical system represented by the data-converted absolute position detection signal. forming on or off signals for the plurality of types of control operations depending on the relationship;
The formed on/off signals are provided to the control device.

FIG. 1 is a block diagram showing the basic configuration of the present invention described above, in which 1 is an absolute position detection means, 2 is a setting means, 3 is a storage means, 4 is a reading means, 5 is a data conversion means, and 6 is an on/off signal forming means. Control devices (such as sequencers or NC controllers) and mechanical systems are shown with dashed lines.

[Effect]

Any program can be set by the setting means 2, the set program is stored in the storage means 3,
The storage means 3 stores a plurality of such programs. Control devices such as sequencers or NC controllers are
By simply providing an arbitrary program designated signal, the specifications of the position detection device of the present invention can be freely adapted to one's own requirements. That is, on/off switching position setting data for a plurality of types of control operations corresponding to the program designated by the program designation signal are read out from the storage means 3, and these on/off switching position setting data and the absolute position detection means 1 are combined. On/off signals corresponding to various control operations are obtained from the on/off signal forming means 6 based on the current position data obtained by data converting the output by the data converting means 5.

The data conversion parameters in the data conversion means 5 include, for example, offset data between the origin of the mechanical system and the origin of the absolute position detection means 1 attached to the mechanical system;
Alternatively, there are parameters for converting data units according to the scale of the mechanical system.

According to this invention, a number of programs relating to on/off switching positions of various control operations are prepared (stored) on the position detection device side, so that requests from the control device side can be responded to at any time. There is. Furthermore, the contents of the program can be changed at any time. Furthermore, since an absolute type position detection element is used, it is accurate and reliable, and even if the power is interrupted, the current position of the mechanical system can be displayed immediately after the power is restored. In addition, since we do not use the output of the absolute position detection means as is, we use data that has been converted according to the parameters suitable for the mechanical system, so the data format when setting the position in the setting means is adapted to the mechanical system. It can be made into a product and is easy to use. For the various reasons mentioned above, it will be understood that the position detection device according to the present invention has an independent intelligence function, is suitable for flexible production systems, and has quick response and versatility. .

Let me explain in detail.

FIG. 2 is a hardware configuration diagram of an embodiment of the position detection device according to the present invention. Absolute position detection means 1 mentioned above
The corresponding one is absolute position detector sensor section 1.
0 and the absolute position detector signal conversion unit 11,
- For example, Japanese Patent Application No. 56-205138 (Japanese Unexamined Patent Publication No. 58-
106691), which is capable of detecting rotational positions over multiple rotations in an absolute manner, is used. In such a type of absolute position detection device, the sensor section 10 consists of a variable magnetic resistance type non-contact sensor, and the signal conversion section 11 to 1
Next, a sine signal and a cosine signal are given to the sensor section 10 as alternating current signals, and an analog output signal in which the electrical angle of the alternating current signal is phase-shifted according to the rotational position of the detection target is outputted from the sensor section 10, and the signal conversion section 11 Then, the rotational position data is obtained digitally by counting the phase difference of the analog output signal with respect to the reference phase. In order to be able to absolutely detect rotational positions over multiple rotations, the sensor unit 10 includes a plurality of sensors with different rotation ratios, and the signal conversion unit 11 receives the output signals of each sensor and detects each rotational position. Absolute rotational position data over multiple rotations is obtained by obtaining data and executing a predetermined arithmetic expression using the data. The mechanical system to be detected is, for example, one that converts the rotational motion of a motor into linear motion by screw feeding or other means, and the above-mentioned multi-rotation type absolute position detection means is used to detect the absolute position over the entire length of the linear motion. Position detection can be performed.

Those corresponding to the aforementioned setting means 2 are included in the operation panel 9. In addition, those corresponding to the aforementioned storage means 3, reading means 4, data conversion means 5, and on/off signal forming means 6 include a CPU (central processing unit) 12, a ROM (read only memory) 13, and a RAM (random access It is included in a microcomputer section consisting of 14 (memory).

The external input interface 7 receives the aforementioned program designation signal from a control device such as a sequencer or an NC controller, and supplies it to the microcomputer section. The external output interface 8 outputs on/off signals for a plurality of types of control operations formed by the processing of the microcomputer unit (particularly by the processing corresponding to the on/off signal forming means 6), and outputs on/off signals of a plurality of types of control operations, which are output to the sequencer or NC controller. It is given to the control device such as. Since the on/off signals for these various control operations play the same role as the on/off output signals of conventional mechanical limit switches, they will be referred to as limit switch outputs for convenience below. Further, for convenience, various control operations will be explained as corresponding to a plurality of limit switch functions on a one-to-one basis, and limit switch numbers will be used to distinguish between various control operations.

FIG. 3 is a diagram showing an example of the arrangement of switches and indicators on the operation panel 9. The functions of each switch and display will be explained with reference to this figure.

The mode selection switch 15 is for selecting the operation mode of the position detection device according to the present invention, and is for "driving".
, "Write", "Teaching", "Erase", and "Parameter".

The second operation mode is a mode in which on/off signals corresponding to each limit switch (various control operations) are formed based on the output of the sensor section 101, and these are outputted via the external output interface 8.

The write mode is a mode in which on/off switching position data corresponding to each limit switch is set based on switch operations on the operation panel 9 and written into the RAM 14.

The teaching mode is a mode in which on/off switching position data corresponding to each limit switch is set by actually moving the sensor section 10, and written to R and AM 14 based on switch operations on the operation panel 9.

The erase mode is a mode for erasing on/off switching position data stored in RA and M14.

The parameter mode is a mode related to processing for converting position data or setting data according to some parameter.

The setting push buttons 16 are for "writing", "teaching", "
Used to set data in the "Erase" and "Parameter" modes.

The on/off selection switch 17 is used to select whether the set position corresponds to the on-switching position or the off-switching position of the limit switch in writing mode or teaching mode.

The output signal display 18 displays the on/off signal status of each limit switch output signal during operation mode or reading setting data, and displays 31 limits numbered 1 to 31 for convenience. It consists of lamps (for example, LEDs) corresponding to each switch, and is turned on in response to the limit switch being turned on, and turned off in response to the limit switch being turned off.

The position data setting up switch 19U and the position data setting down switch 19D are provided corresponding to each decimal digit of the position data, and are used to set the numerical value of the position data.

When the up switch 19U is operated, the numerical value of the corresponding digit of the data display 20 consisting of a 6-digit decimal number display increases, and when the town switch 19D is operated, the numerical value of the corresponding digit of the data display 20 is decreased. . In this way, numerical values can be set independently for each digit. Also, when the up switch 19U or town switch 19D of a digit is continuously pressed and the numerical value of that digit is to be carried up or down, the carry process to the upper digit or the digit down to the lower digit is performed. Processing is now done automatically.

The program number setting up switch 21U and down switch 21'D instruct to count up or down in the same way as described above, increase or decrease the 1-digit decimal display on the Progera I1 number display 22, and set the desired program number. This is for setting.

The switch number setting up switch 23U and the town switch 23D instruct the up or down count in the same manner as described above, and display the corresponding digits in decimal on the switch number display 24, which is a two-digit decimal number display. Increase or decrease;
This is for setting a desired limit switch number.

The data display 20 not only displays set values of position data, but also
You can also display other data.

The data display content display 25 is for displaying the meaning of the data displayed on the data display 20.
When displaying the setting value of the above-mentioned position data, the lamp corresponding to the display of "setting value" (for example, T, ED')
lights up and the position data is "on" or "on" depending on whether it corresponds to the on-switching position or the off-switching position.
The lamp corresponding to the display “Off” lights up. When displaying the current sensor value of the absolute position detection signal obtained by the absolute position detector 10.11 (the value before data conversion by the data conversion means 5) on the data display 20, select The lamp corresponding to the display “No Value” lights up. When displaying the current value of the absolute position detection signal (the value after data conversion of the sensor value by the data conversion means 5) on the data display 20, a lamp corresponding to the "current value" display on the display 25 is used. lights up.

As described above, the switch number display 24 displays the number of the limit switch to which data is to be set, but in the parameter mode it is used to display the parameter code indicating the content of the parameter. In addition, up and down switch 23 for switch number setting
U and 23D are also used to set a parameter code in the parameter mode, and the parameter code set here is displayed on the display U. Further, a parameter display 26 is separately provided, and a lamp corresponding to the selected parameter mode is lit here as well.

Note that the signals outputted via the external output interface 8 include not only each limit switch output signal, but also
Indicates whether or not this position detection device is operating normally.■
An S normal signal is also included.

The output signal display 18 also includes a lamp for displaying the status of this ■S normal signal. On the condition that this ■S normal signal indicates a normal state, the sequencer, NC
A control device such as a controller uses the limit switch output signal as an effective signal. When an abnormality occurs, a predetermined abnormality code indicating the content of the abnormality is displayed on the data display 20 and blinks.

Next, with reference to FIG. 4, the contents of processing related to various modes executed by the microcomputer section will be explained.

After the program starts, a predetermined initialization process is executed, and an interrupt acceptance process 27 is executed.

The interrupt reception processing 27 executes a subroutine as shown in FIG. 5 every time an interrupt clock signal is generated, and after this subroutine is finished, or if the generation timing of the interrupt clock signal has not yet been reached, step Proceed to step 28. In step 28, it is checked whether the operation mode is selected by the mode selection switch 15. If YES, a high-speed interrupt clock is set in step 29, and if NO, a low-speed interrupt clock is set in step 30.

Therefore, when in the operation mode, interrupt reception processing 27 is executed.
The interrupt acceptance processing 27 is performed according to a high-speed interrupt clock (for example, a period of about 40 μs), but when the mode is not in the operation mode, the interrupt reception processing 27 is performed according to a low-speed interrupt clock (for example, a period of about 25 m5). As described later, the fifth
Since the subroutine shown in the figure is a process related to the detected value of the absolute position detector, it is preferable to perform the process more frequently in the driving mode than in other times.

Therefore, the interrupt clock switching process described above is performed.

If not in operation mode, after step 30 1. Parameter to turn off all limit switch outputs in step 31
Which mode is selected is checked in steps 32 to 35, and processing according to each mode is performed. In addition, when the parameter mode is selected, it is possible to check which parameter code among "data shift", "origin setting", and "initial setting" is specified by operating the switch number setting up/down switches 23U and 23D.・〉P36～3
8 and performs processing according to each parameter code.

In the case of the operation mode, after step 29, the process of step 39 is performed, and the current value of the current position of the mechanical system detected by the absolute position detector is displayed on the data display 20, and other necessary displays are performed. After that, interrupt reception processing 2
Return to 7.

The fifth subroutine executed in interrupt reception processing 2γ
To explain with reference to the figure, in step 41, absolute position detection data (referred to as sensor value) obtained by the absolute 1/position detector signal conversion section 11 is captured and stored. In the next step 42, the sensor values are converted into data according to the scale parameters of the mechanical system. In the next step 43, a calculation is performed to convert the sensor value scale-converted in step 42 according to the origin offset parameter to obtain current value data. The current value determined here is displayed on the data display 20 in step 39 described above. In the next step 44, it is checked whether it is in the driving mode or not, and if No, this subroutine ends;
If S, proceed to step 40.

In step 40, external input of a program number designation signal is checked, and the designated program number is displayed on the display 22. - As an example, the number of programs is 8, and 1 to 8
Any one program number is exclusively specified by the control device. In step 40, a program number designation signal is received from the external input interface 7, the designated program number is stored, and the display 22 is displayed based on this storage. At that time, in order to remove chattering or noise from the program number designation signal input,
Even if the input program number changes, it is not immediately memorized, and if the same program number designation input continues for a predetermined period of time (for example, about 100 seconds), the program number designation input is outside the frame. It is assumed that the change is 4-+. After step 40, the process proceeds to step 45.

In step 45, the setting data of the ON/OFF switching positions of all limit switches related to the program number specified by the external control device is read from the setting data storage memory area in the RAM 14, and this and the current value obtained in step 43 are read. Data is compared, and an on/off signal for each limit switch is formed according to the comparison result. Px current position.

When the on-switching position is ONs and the off-switching position is 0FFs, an example of the limit switch on/off signal forming conditions is as follows.

0Ns (when OFFs... If ONs≦Px<0FFs, the output is on, Px
(If ONs, output is off, Px≧0F
If Fs, the output is off.

When 0FF5〈ON,... If 0FFs≦P x (ON s, the output is OFF,
If Px (OFFs), the output is on, Px≧
If ONs, the output is on.

If 0Ns=OFFs, the output is always off.

In step 46, the on/off signals of each limit switch formed as described above are applied to the external output interface 8 and output.

As is clear from the following, in the case of the 1 operation mode, all steps 41 to 46 of the subroutine in Fig. 5 are repeatedly executed according to the high-speed interrupt clock, and each limit switch outputs an on or off signal. Operation panel 9 of FIG. 3 in operation mode
In this state, the data display 20 displays the current value, the data display content display 25 lights up the "current value" lamp, and the program number display 22 displays the specified (reading) program number. Then, on the output signal display 18, the lamp corresponding to the limit switch number outputting the ON output is lit. And each switch for setting 16, 17, 19U ~ 2
3D is disabled.

In cases other than the operation mode, only steps 41 to 43 of the subroutine in FIG. 5 are repeatedly executed according to the low-speed interrupt clock, and sensor values are taken in and current values are calculated.
Limit switch output signal formation and output are not performed.

In the case of write mode, YES in step 32 of FIG.
The process then proceeds to data setting processing 47. The details of the data setting process 47 will be explained with reference to FIG.
8, all up/down switches 19U, 19D,
21U, 21D.

23[J, 23D and setting pushbutton switch 16 and on/
The output of the off selection switch 17 is read and the read data is saved in the RAM 14. In the next on/off switch take process 49, on/off switch take processing 49 is performed based on the saved data.
Check whether the off selection switch 17 has been operated, and if it has been operated, the "ON" lamp and "OFF" indicator on the display 25 will be displayed.
Inverts the lighting of the lamp. Additionally, while the "set value" lamp is on, the set value displayed on the data display 20 (the set value read from the memory) is also reversed to the on or off position according to the operation of the switch 17. .

In each judgment step 50.51.52.53, based on the saved data, the program number setting up/down switches 21U, 21D (step 50), the switch number setting up/down switches 23U, 23D (step 51) , the position data setting up/down switches 19U, 19, D (step 52), and the setting pushbutton switch 16 (step 53) are checked, and if they are turned on, the respective predetermined values are Perform processing.

Steps 54-5 corresponding to each up/down switch
At step 6, the data is counted up or down using the weight corresponding to the turned on up switch or down switch, and the count value is saved in the RAM 14.

The saved count value is displayed on the corresponding display 20, 22.
．． 24 is displayed. Further, in each step 54 to 56, a predetermined flag is set or reset. These flags include flags that instruct each lamp on the display 25 to be turned on or off. In addition, the count value of the saved program number is stored in the RAM 14.
The count value of the saved switch number is used as the program number designation address of the "setting data storage memory" (corresponding to storage means 3 in Figure 1), and the saved switch number designation address is the switch number designation address of the "setting data storage memory". used as.

According to the process of steps 54 and 55, the program number setting up/down switch 21U.

When 21D or the switch number setting up/down switches 23U and 23D are turned on, the "set value" lamp on the display 25 is lit. Furthermore, when a program number and a switch number are specified by operating each of the up/ground switches described above, the ON switching position setting value or OFF switching position setting value corresponding to the switch number is read out from the memory, and the data is displayed. displayed on the device 20. At this time, the "ON" lamp or the "OFF" lamp of the display 25 lights up depending on whether the displayed setting value corresponds to the ON switching position or the OFF switching position.

According to the process in step 56, when the position data setting up switch 19U or down switch 19D is turned on, the "setting value" lamp on the display 25 is turned off, and
The display content on the data display 20 is not the set data (data read from the memory) but the switch 19.
The data is changed to the data (saved count value) set by the operation of U and 19D. When the "setting value" lamp is off, pressing the on/off selection switch 17 will change the setting of whether the data displayed on the data display 20 is to be used as the on-switching position data or the off-switching position data. be able to.

Next, when the setting pushbutton switch 16 is turned on, the position setting data displayed on the data display 20 is transferred to the memory address corresponding to the program number and switch number displayed on each display 22, 24. Write to (
Step 57). At this time, the display 25 is "on" or "
In response to the lighting of the "off" lamp, information indicating that the position setting data is the on-switching position or the off-switching position is simultaneously written.

As mentioned above, in the writing mode, each display 20,
Up/Grand switch i9U compatible with 22 and 24
23I), the on-switching position and off-switching position for a desired limit switch number associated with a desired program number can be set to desired values, respectively, and written into the memory.

In step 45 in the aforementioned operation mode, on/off switching position setting data for each limit switch number related to the designated program number is read out from the memory in which the setting data has been written as described above.

In the case of teaching mode, press Y in step 33 in Figure 4.
From ES, the process advances to teaching data setting processing 58. In this teaching data setting process 58, the current value of the position of the mechanical system obtained at step 43 in FIG. Switch 19D is disabled. Setting the program number, setting the limit switch number, and selecting the ON or OFF switching position are performed in the same manner as in the write mode described above. Further, the data display 20 displays the current value, and the "current value" lamp lights on the display 25. By actually moving the mechanical system to the desired position, setting the "current value" to the desired value, and pressing the setting pushbutton switch, writing to the memory can be started in the same way as in the write mode described above. It will be done.

In the case of the erase mode, from YES in step 34 in FIG. 4, the process proceeds to set value display and erase processing 59.

In this process 59, the position data setting up/down switches 19U and 19D are disabled, and the program number setting up/down switch 21U is disabled.

21D and limit switch number setting up/down switches 2, 3U, and 23D are enabled, and the setting value of the ON or OFF switching position is read from the memory in accordance with the program number and limit switch number selected by switch operation, The read set value is displayed on the data display 20, and the "on" or "off" lamp on the display 25 is turned on.

In this way, the setting value of the desired limit switch number in the desired program number is read out, and when the setting pushbutton switch 1-6 is pressed once in this state, the setting value display on the data display 20 is made to blink, If the switch 16 is pressed once more, the setting data (memory storage data) for all switch numbers after the selected switch number in the selected program number, including the setting values being displayed, are erased. In addition, the setting pushbutton switch 16
If the program number or limit switch number is changed by switch operation at the stage where is pressed once, the erasing program will be reset once, and the data will not be erased even if the switch 16 is pressed one more time.

In the case of parameter mode, YE in step 35 of FIG.
The process advances from S to step 36, and if "data shift" is selected, data shift processing 60 is performed.

"Data shift" is a process of rewriting the stored contents (setting contents) by shifting all the on/off switching position setting values for one program stored in the memory by a predetermined value. When selecting "data shift", select the parameter mode with the mode selection switch 15, operate the switches 23U and 23D, and select "data shift" on the display 24.
Display J). Based on this, data shift processing 60 is executed. In this process 60, the switch 21U,
A desired program number is selected by operating switch 21D, a desired shift value is set by operating switches 19U and '19D, and 4 is displayed on display 20. At this time, it is used for switch 19U. When the setting pushbutton switch 16- is pressed in this state, all set values of the selected program number are data shifted by the selected shift value, and the stored contents are rewritten.

If “origin setting” in parameter mode is selected,
From YES in step 37, origin offset parameter reading processing 61 is performed.

"Origin setting" means that when the absolute position detector is installed in the mechanical system, the difference between the origin of the absolute position detector and the origin of the mechanical system is stored as an origin offset parameter. In this case, the mechanical system is positioned at the origin, and the sensor value obtained from the absolute position detector at that time is stored as an origin offset parameter.

When selecting "origin setting", the user selects the parameter mode and then operates the switches 23U and 23D to display a predetermined parameter code (for example, "92") on the display 24. Process 61 is executed in response to this. Processing 6
In step 1, the sensor value is displayed on the data display 20, and the ``sensor value'' lamp on the 1 indicator 250 is lit. Then, the sensor value displayed when the setting pushbutton switch 16 is pressed is stored in a predetermined location in the RAM 14 as an origin offset parameter. The origin offset parameter thus stored in the "origin setting" mode is used as offset data when performing data conversion calculations in step 43 of FIG. That is, the sensor value is corrected by subtracting the origin offset parameter from the sensor value so that the origin of the sensor value apparently coincides with the origin of the mechanical system.

Note that the origin offset data used in step 43 is
It is assumed that the scale has been converted in the same way as the sensor value. Such "origin setting" processing eliminates the need to precisely match the origin of the absolute position detector to the mechanical system when it is attached to the mechanical system, which is convenient.

If “Initial Settings” in parameter mode is selected,
If YES in step 38, the process advances to scale parameter setting processing 62.

"Initial setting" refers to the process of setting scale parameters for scaling sensor values according to the relationship between the amount of movement of the mechanical system and the detection data (sensor values) of the absolute position detector. be. When selecting "Initial Settings" 01, select the parameter mode, and then
Switch 23U.

23D to display a predetermined parameter code (for example, r93J) on the display 24. In response to this, scale parameter setting processing 62 is executed as follows. Using the switches 19U and 19D, the amount of movement of the mechanical system corresponding to the predetermined sensor value N is inputted in a predetermined unit (for example, a square unit). Then, based on the depression of the setting pushbutton switch 16, the input L is stored as a scale parameter.

The scale parameters thus stored in the "initialization" process are used before performing scale conversion calculations on sensor values in step 42 of FIG. - As an example, this calculation formula is, where L/N indicates the amount of movement of the mechanical system per digit of sensor value (minimum unit of change in sensor value). This type of scale conversion converts the sensor value into a value that corresponds to the actual amount of movement of the mechanical system, so the current value display corresponds to the actual amount of movement of the mechanical system and is easy to understand. This corresponds to the actual movement amount of the mechanical system, making data settings easy. Note that in the above calculation, it is preferable to round off a predetermined digit or less, rather than using the solution of the equation as a scale-converted sensor value as it is. Also, it would be good to be able to select the rounding standard.

For example, Q, in units of 1 mm or 0.01 mm or 0.
It is preferable to select one of the rounding standards in units of 001 mm and round according to this standard.

Incidentally, in the above embodiment, the program number specification during the operation mode was explained as being based only on external input, but it is of course possible to input it using the switches 21U and 21D. Further, the processing corresponding to the data conversion means 5 is performed by the sumitubs 42 and 43 in FIG. Data conversion may be performed by further considering parameters other than the above. Further, the position data setting switch is an up/down switch corresponding to each digit, but is not limited to this, and may be a numeric keypad or other device.

In addition, as an absolute position detection device, the patent application
A multi-period/linear type as shown in No. 188865 may also be used. The principle diagram of such a multi-cycle/linear type or multi-rotation type absolute position detection device as described above is shown in Fig. 7. A plurality of detection units 81. generate electrical output signals Di and D2 at predetermined periods Nl and N2 corresponding to different mechanical displacement amounts Pi and P2 with respect to X, respectively. S2 and each detection unit Sl, 82
The difference in the period between and the output signal DI of each detection section
, D2 to execute an arithmetic expression for calculating the number of cycles Cx from the origin to the current position of the detection target with respect to a predetermined one Sl of the detection unit,
The Abundry 1 position of the detection target is specified by a combination of the integer part of the determined period number Cx and the output signal D1 of the predetermined detection section S1.

Each detection section 81.82 is of variable magnetic resistance type, phase shift type,
It is advantageous to use a contactless type, and examples of such detectors are shown in the prior applications mentioned above.

An example of a rotating type detection unit is shown in a cross-sectional view as shown in Fig. 8, and includes primary coils A1 to D1 and secondary coil A2.
~ Stator part STR including D2 and this stator part ST
A metal body ME that is displaced relative to R and causes a change in magnetic resistance in the magnetic circuit of the coil in accordance with the displacement.
Although not shown, each of the primary coils A1 to D is provided in order to cause the secondary coil to generate an AC output signal having a phase corresponding to the relative displacement of the metal body.
1 with phase-shifted primary AC signals (for example, a sine signal and a cosine signal), and add and synthesize the induced voltages of each of the secondary coils A2 to D2 to obtain the AC output signal;
The apparatus includes means for measuring the phase of this AC output signal to obtain digital data corresponding to the amount of displacement. Metal body ME
T has a predetermined shape such as eccentricity, and is made of a material with good magnetic permeability such as iron, or a material that causes eddy current loss such as copper, or a combination of both.

This invention can be applied not only to one axis of a mechanical system but also to multiple axes. That is, as shown in FIG. 9, absolute position detection means 1x are provided corresponding to each axis (for example, X and Y) of the mechanical system.

1y, respectively, and perform the same processing as in the above embodiment regarding the respective absolute position detection outputs. The setting/memory/calculation section 6# is located at 7~9°11~ in Fig. 2.
14 is collectively shown, and a limit switch output is generated corresponding to each axis X and Y. The program number may be specified for each axis in common, or may be specified for each axis group separately.

Furthermore, on the operation panel, up/down switches for data setting, etc. can be shared between each axis.

In the above embodiment, the switches for setting various data are up/down switches provided for each digit, but the switch is not limited to this, and may be a numeric keypad or other switch.

〔Effect of the invention〕

As described above, according to the present invention, a number of programs related to on/off switching positions of various control operations (limit switches) are prepared on the position detection device side, and in response to requests from the control device side at any time, In addition to being able to generate output related to the requested program, the settings of each program can also be changed at any time.

Furthermore, since it uses an absolute position detection device, it is accurate and reliable, and even if there is a power outage, the current position can be accurately indicated when the power is restored. Furthermore, since the Abunlute position detection data is converted and used according to parameters according to the mechanical system, it is inconvenient when aligning the origin or setting data during installation. In this way, the position detection device of the present invention has an intelligence function independent of the control device, and has responsiveness and versatility suitable for flexible production systems.

[Brief explanation of the drawing]

FIG. 1 is a conceptual diagram showing the basic configuration of this invention, FIG. 2 is a hardware configuration diagram showing an embodiment of this invention, FIG. 3 is a plan view showing an example of the operation panel shown in FIG. 2, and FIG. 4 is a flowchart showing an outline of an example of the main program executed by the microcomputer section in FIG. 2, and FIG.
A flowchart of a subroutine executed when an interrupt clock is received in the interrupt reception process shown in the figure, Figure 6 is a flowchart showing an example of the data setting process of Figure 4, and Figure 7 shows an example of the absolute position detection device in principle. diagram showing,
FIG. 8 is a radial cross-sectional view of a rotary detecting section that can be used as one detecting section of the same detecting device, and FIG. 9 is a block diagram schematically showing another embodiment of the present invention. DESCRIPTION OF SYMBOLS 1...Absolute position detection means, 2...Setting means, 3...Storage means, 4...Reading means, 5...
Data converting means, 6...On/off signal forming means, 7
...External input interface, 8...External output interface, 9...Operation panel, 10...Absolute position detector sensor section, 11...Absolute position detector signal conversion section, 20...Data Display, 19
[J. 19D... Up switch and down switch for setting position data, 21U, 21D... Up switch and down switch for setting program number, 22... Program number display, 23U, 23D... Up switch for setting switch number Switch and down switch, 24...
Switch number display, 18...Limit switch output display.

Claims (1)

[Claims] 1. When a mechanical system is controlled by a control device, a limit switch type position for generating a signal corresponding to a predetermined position or range according to the movement of the mechanical system and giving it to the control device. The detection device includes an absolute position detection means capable of generating an absolute position detection signal over the entire moving range of the mechanical system, and a detection device capable of turning on/off multiple types of control operations with respect to one program.
a setting means that can arbitrarily set the OFF switching position in absolute terms, and such setting can be made independently for each of a plurality of programs; and the plurality of types of control for each program set by the setting means. storage means for storing operation on/off switching position data, respectively; and receiving a program designation signal from the control device and selectively reading out a program designated by the program designation signal from the storage means. readout means for enabling the absolute position detection signal to be output from the absolute position detection means; data conversion means for converting the data representation of the absolute position detection signal outputted from the absolute position detection means in accordance with parameters corresponding to the mechanical system; and forming ON or OFF signals for the plurality of types of control operations, respectively, according to the relationship between each set position regarding the first program and the current position of the mechanical system represented by the data-converted absolute position detection signal. A limit switch type position detection device comprising: on/off signal forming means, and configured to provide each formed on/off signal to the control device. 2. The setting means includes a multi-digit display that displays position data in decimal notation, and an up switch provided corresponding to each digit of the display and operated to increase the numerical value of the corresponding digit. 2. The limit switch type position detection device according to claim 1, further comprising a down switch provided corresponding to each digit of the display and operated to decrease the numerical value of the corresponding digit. 3. The absolute position detection means includes a plurality of detection units that generate electrical output signals at predetermined cycles corresponding to different amounts of mechanical displacement of the object to be detected;
calculation means for calculating the number of cycles from the origin of the detection target to the current position for a predetermined one of the detection units, using the difference in the period between each detection unit and the output signal of each detection unit; The limit switch type position detection according to claim 1, wherein the absolute position of the detection target is specified by a combination of the integer part of the determined period number and the output signal of the predetermined detection section. Device. 4. The limit switch type position detection device according to claim 3, wherein each of the plurality of detection sections is a rotary detection section. 5. The limit switch type position detection device according to claim 3, wherein each of the plurality of detection sections is a linear detection section. 6. Each of the detection units is configured to be displaced relative to a stator unit including a plurality of primary coils and secondary coils, and to apply a magnetic resistance change in accordance with the displacement to a magnetic circuit of the coils. means for causing the secondary coil to generate an AC output signal having a phase corresponding to the relative displacement of the metal body; and digital data corresponding to the amount of displacement by measuring the phase of the AC output signal. A limit switch type position detection device according to claim 4 or 5, further comprising means for obtaining the following.