JP2022057734A - Voltage display control unit and machine tool - Google Patents

Abstract

To provide a voltage display control unit that can display AC voltage at a time interval shorter than a communication period, and a machine tool.SOLUTION: A voltage display control unit comprises: a generation circuit that generates a voltage value signal of AC voltage; a display control circuit that executes voltage display processing; and a relay circuit that communicates with the display control circuit in every predetermined period. The relay circuit creates identifiers corresponding to voltage value signals input during the predetermined period, measures a first time between the start point of the predetermined period and an input point of a first voltage value signal input for the first time after the start point, measures a second time between the input points of two signals, the N-th voltage value signal and the N+1-th voltage value signal that are continuously input during the predetermined period, transmits the first time and the first voltage value signal to the display control circuit in linkage with a first identifier corresponding to the first voltage value signal, and transmits the first time, N second times, and the N+1-th voltage value signal to the display control circuit in linkage with the N+1-th identifier corresponding to the N+1-th voltage value signal input after the first voltage value signal.SELECTED DRAWING: Figure 6

Description

The present technology relates to a voltage display control device that controls a voltage display of an AC power supply and a machine tool including the voltage display control device.

Conventionally, there is a detection device that compares the voltage between two phases of a three-phase AC power supply and a predetermined voltage, outputs a pulse signal proportional to the voltage between the two phases, and detects the presence or absence of a voltage abnormality. When the detection device detects a voltage abnormality, the drive device connected to the power supply can be stopped to ensure safety (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 202-124093

In order to improve safety, it is desirable to display the voltage on the screen and visually monitor it by the operator in addition to the detection by the detection device. For visual monitoring, the drive device comprises, for example, a voltage detection circuit for detecting the power supply voltage and a display screen. The drive device may include a first control circuit that outputs the detection result of the voltage detection circuit and a second control circuit that controls the display screen. The first control circuit and the second control circuit communicate with each other in a predetermined communication cycle. The voltage detection device transmits a signal indicating the voltage to the second control circuit at a predetermined sampling cycle. Since the communication cycle is longer than the sampling cycle, the second control circuit cannot display the AC voltage in the sampling cycle.

The present disclosure has been made in view of such circumstances, and an object of the present invention is to provide a voltage display control device and a machine tool capable of displaying an AC voltage at a time interval shorter than a communication cycle.

The voltage display control device according to the embodiment of the present disclosure includes a generation circuit that generates a voltage value signal indicating a voltage value of an AC voltage at a predetermined sampling cycle, a display control circuit that executes the display process of the AC voltage, and a display control circuit. The relay circuit comprises a relay circuit that communicates with the display control circuit at predetermined intervals longer than the sampling cycle and transmits the voltage value signal input from the generation circuit to the display control circuit. A creation unit that creates an identifier corresponding to each voltage value signal input during the predetermined cycle, a start time of the predetermined cycle, and an input time of the first voltage value signal input first after the start time. The second between the input time points of the two Nth voltage value signals (N is a natural number) and the N + 1 voltage value signals that are continuously input during the predetermined period and the first measurement unit that measures the first time between them. The first transmission unit that transmits the first time and the first voltage value signal to the display control circuit in association with the second measurement unit that measures the time and the first identifier corresponding to the first voltage value signal. And, in association with the N + 1 identifier corresponding to the N + 1 voltage value signal input after the first voltage value signal, the display control of the first time, the N second time and the N + 1 voltage value signal. The display control circuit has a second transmission unit that transmits to the circuit, and the display control circuit performs a process of displaying the voltage value in time series at intervals shorter than the predetermined cycle based on the information received from the relay circuit. Run.

In the present disclosure, the relay circuit creates a first identifier corresponding to a first voltage value signal input during a predetermined cycle, that is, a communication cycle, and associates the first identifier with the first time and the first voltage. The value signal is sent to the display control circuit. Further, a N + 1 identifier corresponding to the N + 1 voltage value signal (N is a natural number) is created, linked to the N + 1 identifier, and the display control circuit displays the first time, N second time, and N + 1 voltage value signals. Send to. The display control circuit executes a process of displaying the voltage value in time series at time intervals shorter than a predetermined cycle based on the information received from the relay circuit.

In the voltage display control device according to the embodiment of the present disclosure, when the display control circuit receives information from the first transmission unit, the AC voltage at the time when the first time has elapsed from the start time. When information is received from the first processing unit that executes the process of displaying the voltage value and the second transmission unit, the first time and N second hours have elapsed from the start time. It is provided with a second processing unit that executes a process of displaying the voltage value of the AC voltage.

In the present disclosure, the display control circuit displays the voltage value of the AC voltage at time intervals shorter than a predetermined cycle based on the information received from the first transmission unit and the second transmission unit.

In the voltage display control device according to the embodiment of the present disclosure, in the relay circuit, when the number P of the voltage value signals input during the predetermined cycle exceeds a predetermined number Q (P and Q are natural numbers). The information associated with the PQ identifier is not transmitted from the first identifier, but the information associated with the P-identifier is transmitted from the PQ + 1 identifier.

In the present disclosure, the relay circuit does not transmit the information associated with the PQ identifier from the first identifier when the number P of the voltage value signals input during the predetermined cycle exceeds the predetermined number Q. The relay circuit only needs to be able to store information about P voltage value signals, and the storage capacity can be reduced.

In the voltage display control device according to the embodiment of the present disclosure, in the display control circuit, when the number P of the voltage value signals input during the predetermined cycle exceeds a predetermined number Q (P and Q are natural numbers). , The processing of the information associated with the PQ identifier from the first identifier is not executed, but the processing of the information associated with the PQ identifier from the first PQ + 1 identifier is executed.

In the present disclosure, the display control circuit does not process the information associated with the first PQ identifier from the first identifier when the number P of the voltage value signals input during the predetermined cycle exceeds the predetermined number Q. The processing in the display control circuit can be reduced.

The machine tool according to the embodiment of the present disclosure includes the above-mentioned voltage display control device.

In the present disclosure, the same operation as that of the voltage display control device described above occurs.

In the voltage display control device and the machine tool according to the embodiment of the present disclosure, the relay circuit creates a first identifier corresponding to a first voltage value signal input during a predetermined cycle, that is, a communication cycle. The first time and the first voltage value signal are transmitted to the display control circuit in association with the first identifier. Further, the N + 1 identifier corresponding to the N + 1 voltage value signal is created, associated with the N + 1 identifier, and the first time, N second time and the N + 1 voltage value signal are transmitted to the display control circuit. The display control circuit executes a process of displaying the voltage value in time series at time intervals shorter than a predetermined cycle based on the information received from the relay circuit. Therefore, the display control circuit can display the voltage value in time series with a sampling cycle shorter than the communication cycle.

It is a schematic perspective view of the machine tool which concerns on Embodiment 1. FIG. It is a perspective view which shows the machine tool provided with the cover for a machine tool. It is a block diagram of a three-phase AC power supply, a control panel, a display control circuit, a display unit, and the like. It is a block diagram of a pulse conversion circuit. It is explanatory drawing explaining the conversion of a three-phase AC voltage into a pulse wave in a conversion circuit. It is a block diagram of a drive control circuit and a display control circuit. It is explanatory drawing explaining the start time W1 and the end time W2 of the communication cycle, the input time points k1 to k3 of three voltage value signals, the communication cycle W, the first time T1, the second time T2a, and the second time T2b. It is a schematic diagram which shows the 1st state, the 2nd state and the 3rd state which are the storage states to the 1st region, the 2nd region and the 3rd region. It is explanatory drawing of the voltage display processing which a display control circuit executes when three voltage value signals are continuously input to a drive control circuit during a communication cycle W. Explanation for explaining the start time point W1 and the end time point W2 of the communication cycle, the input time points k1 to k4 of the four voltage value signals, the communication cycle W, the first time T1, the second time T2a, the second time T2b, and the second time T2c. It is a figure. It is a schematic diagram which shows the 1st state, the 2nd state, the 3rd state and the 4th state which are the storage states in the 1st region, the 2nd region and the 3rd region. It is explanatory drawing of the voltage display processing which a display control circuit executes when four voltage value signals are continuously input to a drive control circuit during a communication cycle W. It is a block diagram of the drive control circuit and the display control circuit which concerns on Embodiment 2. FIG.

(Embodiment 1)
Hereinafter, the present invention will be described with reference to the drawings showing the machine tool according to the first embodiment. In the following explanation, the top, bottom, front, back, left, and right shown in the figure are used. FIG. 1 is a schematic perspective view of the machine tool 100, and FIG. 2 is a perspective view illustrating the machine tool 100 provided with the machine tool cover 1. The machine tool 100 includes a base 20, a fixed base 21, a Y-direction moving device 22, an X-direction moving device 26, a vertical column 28, a Z-direction moving device 30, a spindle head 32, a tool changing device 10, a spindle motor 35, and a work holding portion 120. Etc. are provided. The base 20 is fixed on the floor surface. The fixed base 21 has a rectangular box shape that is long in the front-rear direction and is provided on the base 20. The work holding portion 120 is provided on the front portion of the fixing base 21. The fixing base 21 fixes the Y-direction moving device 22. The Y-direction moving device 22 includes a Y-axis motor 23 (see FIG. 3) and a ball screw mechanism (not shown) driven by the Y-axis motor 23.

The X-direction moving device 26 is provided in the ball screw mechanism of the Y-direction moving device 22. The X-direction moving device 26 includes an X-axis motor 27 (see FIG. 3) and a ball screw mechanism (not shown) driven by the X-axis motor 27. A vertical column 28 is provided in the ball screw mechanism of the X-direction moving device 26. The X-direction moving device 26 and the Y-direction moving device 22 support the vertical column 28 so as to be movable in the X-direction (left-right direction) and the Y-direction (front-back direction).

The Z-direction moving device 30 is provided on the front surface of the vertical column 28. The Z-direction moving device 30 includes a Z-axis motor 31 (see FIG. 3) and a ball screw mechanism (not shown) driven by the Z-axis motor 31. The spindle head 32 is provided in the Z-direction moving device 30. The vertical column 28 supports the spindle head 32 so as to be movable in the Z direction (vertical direction) via the Z direction moving device 30. The spindle motor 35 is provided above the spindle head 32. The spindle head 32 supports a spindle (not shown) whose axial direction is up and down. The spindle motor 35 rotates around the spindle. The tool changer 10 is driven by the tool changer motor 12 to change the tool mounted on the spindle.

As shown in FIG. 2, the machine tool 100 includes a machine tool cover 1 that surrounds most of the machine body. The machine tool cover 1 is provided on the upper side of the base 20. The machine tool cover 1 extends in the vertical direction and includes a rectangular front wall 5, a left wall 6, a right wall 7, and a rear wall 8 that cover the front, rear, left, and right sides of the machine body of the machine tool 100, respectively. Further, the upper side of the machine tool 100 is covered, and a substantially rectangular ceiling 9 parallel to the left-right direction and the front-back direction is provided. A control panel 80 for controlling the drive of each motor is provided on the rear wall 8.

A vertically long rectangular opening 51 is provided in the center of the front wall 5. A vertically long rectangular right door 52 and a left door 53 are arranged side by side in the opening 51 so as to be movable in the left-right direction. To the right of the opening 51, an operation panel 54 for an operator to input a command is provided. A display unit 55a is provided on the operation panel 54. The machine tool 100 includes a display control circuit 55 (see FIG. 3). The display control circuit 55 displays information on the display unit 55a based on an input from the operation panel 54, an input from the drive control circuit 82 (see FIG. 3) described later, and the like.

FIG. 3 is a block diagram of a three-phase AC power supply 40, a control panel 80, a display control circuit 55, a display unit 55a, and the like. The three-phase AC power supply 40 is connected to each drive circuit 31a, 35a, 27a, 23a, 12a via a relay 85. The drive circuit 31a is connected to the Z-axis motor 31. The drive circuit 35a is connected to the spindle motor 35. The drive circuit 27a is connected to the X-axis motor 27. The drive circuit 23a is connected to the Y-axis motor 23. The drive circuit 12a is connected to the tool change motor 12. The drive control circuit 82 controls the drive of the relay 85 and the drive circuits 31a, 35a, 27a, 23a, 12a.

The three-phase AC power supply 40 inputs the voltage between the R phase and the S phase, the voltage between the S phase and the T phase, and the voltage between the T phase and the S phase into the drive circuits 31a, 35a, 27a, 23a, and 12a. The three-phase AC power supply 40 inputs the voltage between the R phase and the S phase, the voltage between the S phase and the T phase, and the voltage between the T phase and the S phase to the pulse conversion circuit 81. The pulse conversion circuit 81 converts each input voltage into a pulse wave and inputs it to the drive control circuit 82. The drive control circuit 82 generates information for displaying the voltage based on the pulse wave. The drive control circuit 82 communicates with the display control circuit 55 every time a predetermined cycle T elapses. The display control circuit 55 displays the voltage on the display unit 55a based on the information received from the drive control circuit 82. The pulse conversion circuit 81, the drive control circuit 82, and the display control circuit 55 constitute a voltage display control device.

FIG. 4 is a block diagram of the pulse conversion circuit 81, and FIG. 5 is an explanatory diagram illustrating the conversion of the three-phase AC voltage into the pulse wave in the conversion circuit 81c. The pulse conversion circuit 81 constitutes a generation circuit. The pulse conversion circuit 81 includes a rectifying step-down circuit 81a, a protection circuit 81b, a conversion circuit 81c, and a pulse wave output circuit 81d. As described above, the voltage between the R phase and the S phase, the voltage between the S phase and the T phase, and the voltage between the T phase and the S phase are input to the pulse conversion circuit 81. FIG. 4 shows the R phase and the S phase. Only the rectifying step-down circuit 81a, the protection circuit 81b, the conversion circuit 81c, and the pulse wave output circuit 81d corresponding to any one of the voltage between the phases, the voltage between the S phase and the T phase, and the voltage between the T phase and the S phase are used. Described representatively. The rectifying step-down circuit, protection circuit, conversion circuit, and pulse wave output circuit corresponding to the other two voltages have the same configurations as the rectifying step-down circuit 81a, protection circuit 81b, conversion circuit 81c, and pulse wave output circuit 81d. Omit.

The three-phase AC power supply 40 inputs a voltage to the rectifying step-down circuit 81a. The rectifying step-down circuit 81a rectifies the input voltage and lowers it to the voltage corresponding to the drive control circuit 82. The rectifying step-down circuit 81a inputs a voltage to the protection circuit 81b. The protection circuit 81b is a circuit for preventing a failure of the drive control circuit 82. For example, when the magnitude of the input voltage to the protection circuit 81b is larger than the preset threshold value, the protection circuit 81b does not output the voltage.

The protection circuit 81b outputs a voltage to the conversion circuit 81c. The conversion circuit 81c converts the input voltage into a pulse wave. As shown in FIG. 5, the conversion circuit 81c samples the three-phase AC voltage 70, that is, the analog voltage in a predetermined sampling period k, for example, 230 to 300 μs. The sampled voltage value is converted into a pulse wave 71, for example, a rectangular wave having a duty ratio corresponding to the magnitude of the voltage value. The conversion circuit 81c outputs the pulse wave 71 to the pulse wave output circuit 81d.

The pulse wave output circuit 81d has a photocoupler. The light emitting element of the photocoupler emits light by the input pulse wave 71. The light receiving element of the photocoupler receives light and performs photoelectric conversion, and outputs a voltage value signal 72 indicating a voltage value to the drive control circuit 82. The voltage value signal 72 is a pulse wave, for example, a rectangular wave having a duty ratio corresponding to the magnitude of the voltage value.

FIG. 6 is a block diagram of the drive control circuit 82 and the display control circuit 55. The drive control circuit 82 constitutes a relay circuit. The synchronization signal is input to the drive control circuit 82 and the display control circuit 55, and the drive control circuit 82 and the display control circuit 55 communicate with each other when the synchronization signal is input, that is, every time the communication cycle W elapses. The communication cycle W is longer than the sampling cycle k, for example, 1 ms. The voltage value signal 72 is input to the drive control circuit 82 every time the sampling cycle k elapses. The drive control circuit 82 includes a storage unit 90, a creation unit 91, a timekeeping unit 92, a calculation unit 93, and a communication interface (communication I / F) 94.

The creating unit 91 sequentially creates an identifier corresponding to the voltage value signal 72 for each input of the voltage value signal 72. The timekeeping unit 92 measures the input time point of the voltage value signal 72, the start time point and the end time point of the communication cycle, and the like. The timekeeping unit 92 measures the start time point, the end time point, and the like of the communication cycle based on the synchronization signal.

The calculation unit 93 calculates various times based on the time point measured by the time measuring unit 92, and also calculates the voltage value indicated by the voltage value signal 72. The storage unit 90 stores information such as time and voltage value in association with the identifier created by the creation unit. The storage unit 90 includes a first region 90a, a second region 90b, and a third region 90c, and each region stores each identifier and information associated with each identifier. The communication I / F 94 transmits each identifier and the information associated with each identifier to the display control circuit 55. The display control circuit 55 includes a display processing unit 56. The display processing unit 56 executes a process of displaying the voltage value of the AC voltage on the display unit 55a based on the information received from the drive control circuit 82. The display processing unit 56 constitutes a first processing unit and a second processing unit.

FIG. 7 is an explanatory diagram illustrating the start time point W1 and the end time point W2 of the communication cycle, the input time points k1 to k3 of the three voltage value signals, the communication cycle W, the first time T1, the second time T2a, and the second time T2b. Is. At the input time points k1, k2, and k3, the input time point k1 is the oldest time point, and the input time point k3 is the newest time point. A case where three voltage value signals 72 are continuously input to the drive control circuit 82 between the start time point W1 and the end time point W2, that is, during the communication cycle W, will be described.

The voltage value signal 72 input at the input time point k1 is the first voltage value signal, the voltage value signal 72 input at the input time point k2 is the second voltage value signal, and the voltage value signal 72 input at the input time point k3 is the third voltage value signal. It is called. The creating unit 91 creates a first identifier, a second identifier, and a third identifier in order corresponding to the first voltage value signal, the second voltage value signal, and the third voltage value signal.

The calculation unit 93 calculates the time between the time point W1 and the time point k1, that is, the first time T1 based on the input time points k1 to k3 and the start time point W1 measured by the timekeeping unit 92, and calculates the time point k1 and the time point k2. The time between time points, that is, the second time T2a is calculated, and the time between the time points k2 and the time point k3, that is, the second time T2b is calculated. The timing unit 92 and the calculation unit 93 constitute a first measurement unit and a second measurement unit.

FIG. 8 is a schematic diagram showing a first state, a second state, and a third state, which are storage states in the first region 90a, the second region 90b, and the third region 90c. When the first voltage value signal, that is, the first voltage value signal is input to the drive control circuit 82 after the input of the synchronization signal, that is, after the start time W1, the timing unit 92 and the calculation unit 93 calculate the first time T1. , The first voltage value signal and the first time T1 are stored in the first region 90a in association with the first identifier. The first voltage value signal associated with the first identifier and the first time T1 are referred to as first identifier information (see the first state in FIG. 8).

When the second voltage value signal is input to the drive control circuit 82, the storage unit 90 moves the first identifier information to the second region 90b. The timekeeping unit 92 and the calculation unit 93 calculate the second time T2a and store the second voltage value signal, the first time T1 and the second time T2a in the first region 90a in association with the second identifier. The second voltage value signal associated with the second identifier, the first time T1 and the second time T2a are referred to as the second identifier information (see the second state in FIG. 8).

When the third voltage value signal is input to the drive control circuit 82, the storage unit 90 moves the first identifier information to the third region 90c and the second identifier information to the second region 90b. The timekeeping unit 92 and the calculation unit 93 calculate the second time T2b, associate it with the third identifier, and put the third voltage value signal, the first time T1, the second time T2a, and the second time T2b into the first region 90a. Remember. The third voltage value signal associated with the third identifier, the first time T1, the second time T2a, and the second time T2b are referred to as the third identifier information (see the third state in FIG. 8).

At the time of input of the synchronization signal, that is, at the end time W2, the drive control circuit 82 stores the first identifier information, the second identifier information, and the third identifier information stored in the first region 90a, the second region 90b, and the third region 90c. It is transmitted to the display control circuit 55 via the communication I / F94. The communication I / F 94 constitutes a first transmission unit and a second transmission unit.

The end time point W2 is also the start time point W1 of the new communication cycle, and when the first voltage value signal, that is, the first voltage value signal is input to the drive control circuit 82 after transmission, it becomes the first state of the new communication cycle. When the third state of the old communication cycle is changed to the first state of the new communication cycle, the storage unit 90 deletes the first identifier information stored in the third area 90c in the old communication cycle, and the second area. The second identifier information stored in the 90b is moved to the third region 90c, and the third identifier information stored in the first region 90a is moved to the second region. Since the storage unit 90 sequentially moves and deletes the information stored in the old communication cycle in the new communication cycle, in the third state of the new communication cycle, the storage unit 90 is a drive control circuit in the new communication cycle. Only the information about the voltage value signal 72 input to 82 is stored.

FIG. 9 is an explanatory diagram of voltage display processing executed by the display control circuit 55 when three voltage value signals 72 are continuously input to the drive control circuit 82 during the communication cycle W. In FIG. 9, the broken line indicates the AC voltage waveform displayed on the display unit 55a, and the black circle indicates the voltage value. The display control circuit 55 displays the voltage values at the time points k1, k2, and k3 on the display unit 55a based on the first identifier information, the second identifier information, and the third identifier information received from the drive control circuit 82. The display control circuit 55 additionally displays three voltage values on the display unit 55a each time the communication cycle W elapses.

FIG. 10 shows the start time W1 and the end time W2 of the communication cycle, the input points k1 to k4 of the four voltage value signals, the communication cycle W, the first time T1, the second time T2a, the second time T2b, and the second time T2c. It is explanatory drawing explaining. At the input time points k1, k2, k3, and k4, the input time point k1 is the oldest time point, and the input time point k4 is the newest time point. A case where four voltage value signals 72 are continuously input to the drive control circuit 82 between the start time point W1 and the end time point W2, that is, during the communication cycle W, will be described in the drive control circuit 82. Since the description of the first voltage value signal, the second voltage value signal, and the third voltage value signal input to the input time points k1, k2, and k3 has already been described, they will be omitted.

The voltage value signal 72 input at the input time point k4 is referred to as a fourth voltage value signal. The creation unit 91 creates a fourth identifier corresponding to the fourth voltage value signal. The calculation unit 93 calculates the time between the input time points k3 and k4 measured by the timekeeping unit 92, that is, the second time T2c.

FIG. 11 is a schematic diagram showing a first state, a second state, a third state, and a fourth state, which are storage states in the first region 90a, the second region 90b, and the third region 90c. Since the first state, the second state, and the third state are the same as the first state, the second state, and the third state shown in FIG. 8, the description thereof will be omitted.

In the third state, the first region 90a stores the third identifier information, the second region 90b stores the second identifier information, and the third region 90c stores the first identifier information. When the fourth voltage value signal is input to the drive control circuit 82, the storage unit 90 deletes the first identifier information, moves the second identifier information to the third region 90c, and transfers the third identifier information to the second region 90b. Moving. The timekeeping unit 92 and the calculation unit 93 calculate the second time T2c and associate it with the fourth identifier to obtain the fourth voltage value signal, the first time T1, the second time T2a, the second time T2b, and the second time T2c. Store in the first region 90a. The fourth voltage value signal associated with the fourth identifier, the first time T1, the second time T2a, the second time T2b, and the second time T2c are referred to as the fourth identifier information (see the fourth state in FIG. 11). ..

At the time of input of the synchronization signal, that is, at the end time W2, the drive control circuit 82 stores the second identifier information, the third identifier information, and the fourth identifier information stored in the first region 90a, the second region 90b, and the third region 90c. It is transmitted to the display control circuit 55 via the communication I / F94.

FIG. 12 is an explanatory diagram of voltage display processing executed by the display control circuit 55 when four voltage value signals 72 are continuously input to the drive control circuit 82 during the communication cycle W. In FIG. 12, white circles indicate the deleted voltage values. The display control circuit 55 displays the voltage values at the time points k2, k3, and k4 on the display unit 55a based on the second identifier information, the third identifier information, and the fourth identifier information received from the drive control circuit 82. The display control circuit 55 additionally displays three voltage values on the display unit 55a each time the communication cycle W elapses. Since the drive control circuit 82 has deleted the first identifier information, the display control circuit 55 does not display the voltage value at the time point k1 (see the white circle in FIG. 12).

When five voltage value signals 72 are continuously input to the drive control circuit 82 during the communication cycle W, the drive control circuit 82 deletes the first identifier information and the second identifier information, so that the display control circuit 55 can be used. Do not display the voltage value at time points k1 and k2. That is, when the number P of the voltage value signals input during the communication cycle W exceeds the predetermined number Q, that is, the number of regions for storing the identifier information set in the storage unit 90, the drive control circuit 82 is the first identifier. Does not send the information associated with the PQ identifier. Since the predetermined number Q is the number of areas for storing the identifier information set in the storage unit 90, when the number of set areas is 4 or more, the predetermined number Q is also 4 or more.

In the machine tool according to the first embodiment, the drive control circuit 82 creates a first identifier corresponding to the first voltage value signal input during the communication cycle W, and associates it with the first identifier. The first time and first voltage value signals are transmitted to the display control circuit. In addition, a second identifier and a third identifier corresponding to the second voltage value signal and the third voltage value signal are created, linked to the second identifier, and the first time T1, the second time T2a, and the second voltage value signal are linked. Is transmitted to the display control circuit, and the first time T1, the second time T2a, the second time T2b, and the third voltage value signal are transmitted to the display control circuit 55 in association with the third identifier.

The display control circuit 55 executes a process of displaying voltage values in time series at time intervals T1, T2a, and T2b shorter than a predetermined cycle based on the information received from the drive control circuit 82.

Further, when the number P of the voltage value signals input during the communication cycle W exceeds the predetermined number Q (the number of regions for storing the identifier information set in the storage unit 90), the drive control circuit 82 starts from the first identifier. Do not send the information associated with the PQ identifier. The drive control circuit 82 only needs to be able to store information about P voltage value signals, and can reduce the storage capacity.

Further, since the information stored in the first region 90a, the second region 90b, and the third region 90c is sequentially moved, that is, shifted, when the information is updated, the first region 90a, the second region 90b, and the third region are used. There is no need to reset 90c, and processing can be reduced.

The communication cycle W is set in advance. The second time is determined by the specifications of the pulse conversion circuit 81. Depending on the characteristics of the pulse conversion circuit 81, the actual second time T2a, T2b, T2c may be longer or shorter than the second time specified by the specifications. Further, the communication cycle W and the second time are independent of each other, and the first time T1 is not determined. Therefore, the number of voltage value signals 72 input to the drive control circuit 82 during the communication cycle W is not constant.

In many cases, the number of voltage value signals 72 input to the drive control circuit 82 during the communication cycle W is determined based on the preset communication cycle W and the second time determined by the specifications of the pulse conversion circuit 81. In the above-described embodiment, there are three. It is rarely four for the above reasons. Therefore, by setting three areas, that is, the first area 90a, the second area 90b, and the third area 90c in the storage unit 90 and sequentially shifting the information stored in each area, the reset process of the area is reduced. , The storage capacity can be reduced and the accuracy of the voltage display can be maintained.

(Embodiment 2)
Hereinafter, the present invention will be described with reference to the drawings showing the machine tool according to the second embodiment. Of the configurations of the second embodiment, the same configurations as those of the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted. FIG. 13 is a block diagram of the drive control circuit 82 and the display control circuit 55.

The drive control circuit 82 includes a counting unit 95. The counting unit 95 measures the number of voltage value signals 72 input to the drive control circuit 82. The display control circuit 55 includes a storage unit 57, and the storage unit 57 stores a predetermined number Q, that is, the number of areas for storing identifier information set in the storage unit 90 in advance. In this embodiment, 3 is set.

The drive control circuit 82 transmits to the display control circuit 55 information about the voltage value signal 72 input during the communication cycle W and the number measured by the counting unit 95. The display processing unit 56 determines whether or not the number P measured by the counting unit 95 exceeds the predetermined number Q, and if the number P exceeds the predetermined number Q, the display processing unit 56 does not process the information associated with the PQ identifier from the first identifier. If not exceeded, all information associated with each identifier is processed.

When the first voltage value signal, the second voltage value signal and the third voltage value signal are input during the communication cycle W, the first identifier information, the second identifier information, the third identifier information, and the counting unit 95 measure. The drive control circuit 82 transmits the above-mentioned “3” to the display control circuit 55.

Since the "3" measured by the counting unit 95 does not exceed the predetermined number Q, that is, 3, the display processing unit 56 processes the first identifier information, the second identifier information, and the third identifier information, and displays the voltage value. Displayed at 55a.

When the first voltage value signal, the second voltage value signal, the third voltage value signal, and the fourth voltage value signal are input during the communication cycle W, the first identifier information, the second identifier information, the third identifier information, The drive control circuit 82 transmits the fourth identifier and the “4” measured by the counting unit 95 to the display control circuit 55.

Since the "4" measured by the counting unit 95 exceeds a predetermined number Q, that is, 3, the display processing unit 56 does not process the information associated with the PQ identifier from the first identifier. That is, it does not process the first identifier information. The display processing unit 56 processes the second identifier information, the third identifier information, and the fourth identifier information, and displays the voltage value on the display unit 55a.

When the first voltage value signal to the fifth voltage value signal are input to the drive control circuit 82 during the communication cycle W, the display processing unit 56 processes the information associated with the PQ identifier from the first identifier. do not. That is, the first identifier information and the second identifier information are not processed. The display processing unit 56 processes the third identifier information, the fourth identifier information, and the fifth identifier information, and displays the voltage value on the display unit 55a. The same applies when six or more voltage value signals are input to the drive control circuit 82 during the communication cycle W.

In the machine tool 100 according to the second embodiment, when the number P of the voltage value signals input during the communication cycle W exceeds the predetermined number Q, the display control circuit 55 has the first identifier to the P-. Do not process the information associated with the Q identifier. Therefore, the processing in the display control circuit 55 can be reduced.

The embodiments disclosed this time should be considered to be exemplary in all respects and not restrictive. The technical features described in each example can be combined with each other and the scope of the invention is intended to include all modifications within the scope of the claims and the scope of the claims. Will be done.

55 Display control circuit (voltage display control device)
56 Display processing unit (first processing unit, second processing unit)
81 Pulse conversion circuit (generation circuit, voltage display controller)
82 Drive control circuit (relay circuit, voltage display control device)
91 Creation part 92 Timekeeping part (1st measurement part, 2nd measurement part)
93 Calculation unit (first measurement unit, second measurement unit)
94 Communication I / F (1st transmitter, 2nd transmitter)
100 machine tools

Claims (5)

A generation circuit that generates a voltage value signal indicating the voltage value of AC voltage at a predetermined sampling cycle, and
A display control circuit that executes the AC voltage display process,
It is provided with a relay circuit that communicates with the display control circuit at predetermined intervals longer than the sampling cycle and transmits the voltage value signal input from the generation circuit to the display control circuit.
The relay circuit is
A creation unit that creates an identifier corresponding to each voltage value signal input during the predetermined cycle, and
A first measuring unit that measures the first time between the start time of the predetermined cycle and the input time of the first input voltage value signal after the start time, and
A second measuring unit that measures the second time between the input time points of the two Nth voltage value signals (N is a natural number) and the N + 1 voltage value signals that are continuously input during the predetermined period.
A first transmission unit that transmits the first time and the first voltage value signal to the display control circuit in association with the first identifier corresponding to the first voltage value signal.
The first time, the N second time and the N + 1 voltage value signal are sent to the display control circuit in association with the N + 1 identifier corresponding to the N + 1 voltage value signal input after the first voltage value signal. It has a second transmitter to transmit,
The display control circuit is a voltage display control device that executes a process of displaying the voltage value in a time series at a time interval shorter than the predetermined cycle based on the information received from the relay circuit. The display control circuit is
When the information from the first transmission unit is received, the first processing unit that executes the process of displaying the voltage value of the AC voltage at the time when the first time has elapsed from the start time, and the first processing unit.
When the information from the second transmitter is received, the second process of executing the process of displaying the voltage value of the AC voltage at the time when the first time and N second hours have elapsed from the start time. The voltage display control device according to claim 1, further comprising a unit. In the relay circuit, when the number P of the voltage value signals input during the predetermined cycle exceeds the predetermined number Q (P and Q are natural numbers), the information associated with the first identifier to the PQ identifier. The voltage display control device according to claim 1 or 2, wherein the information associated with the P identifier is transmitted from the PQ + 1 identifier without transmitting. In the display control circuit, when the number P of the voltage value signals input during the predetermined cycle exceeds the predetermined number Q (P and Q are natural numbers), the display control circuit is associated with the first identifier to the PQ identifier. The voltage display control device according to claim 1 or 2, wherein the processing of the information associated with the PQ + 1 identifier to the P identifier is executed without executing the processing of the information. A machine tool comprising the voltage display control device according to any one of claims 1 to 4.

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