JP2011180702A - Transfer detection system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transfer detection system capable of detecting the transfer of a machine while permitting the movement of the machine within a fixed range. <P>SOLUTION: Numerical control devices 1A to 1C are connected to a transfer detection device 20 via wiring 11A to 11C. The numerical control devices 1A to 1C can be moved within a range reached by the wiring 11A to 11C. The unique ID of the numerical control devices 1A to 1C is stored in the transfer detection device 20. In the case of starting the numerical control devices 1A to 1C, when their own unique ID is not stored in the transfer detection device 20, the start of the numerical control devices is inhibited. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a relocation detection system.

  Conventionally, as a technology for monitoring the relocation of equipment, by detecting and storing the vibration applied to the device during the power-off period of the equipment, it is determined whether or not there is a vibration history after the power is turned on again. There is known a relocation detection device that prohibits activation of the device. For example, the inclination detecting means of the numerical control device, the relocation determining means for determining that the numerical control device has been relocated when the inclination detecting means detects an inclination greater than a preset reference value, and the numerical control when determining that the relocation has been relocated. A numerical control device having a relocation detection function including use prohibiting means for prohibiting use of the device is disclosed (for example, see Patent Document 1).

JP 2009-134561 A

  However, in the numerical control device having the relocation detection function described in Patent Document 1, the relocation is detected when the numerical control device is moved for layout change. Therefore, there is a problem that the layout cannot be easily changed.

  The present invention has been made to solve the above-described problem, and an object of the present invention is to provide a relocation detection system that can detect relocation of a machine while allowing the movement of the machine within a certain range.

  The relocation detection system according to the first aspect of the present invention includes relocation detection means for detecting relocation of a machine, and operation prohibiting means for prohibiting operation of the machine when the relocation detection means detects relocation of the machine. In the relocation detection system, a machine frame for housing the relocation detection means is provided separately from the machine, and a response time required for communication with the machine is provided by communication means for communicating the relocation detection means and the machine. Response time detecting means for detecting, and response time determining means for determining whether or not the response time detected by the response time detecting means exceeds a predetermined time, and the operation prohibiting means comprises the response time determining means. The operation of the machine is prohibited when it is determined by the means that the response time exceeds the predetermined time.

  In the first aspect, the machine frame that houses the transfer detecting means is provided separately from the machine. The movement detection means communicates with the machine via the communication means. The response time detection means detects the response time required for communication with the machine by the communication means. The response time determination unit determines whether or not the response time detected by the response time detection unit exceeds a predetermined time. The operation prohibiting unit prohibits the operation of the machine when the response time determining unit determines that the response time exceeds a predetermined time. If the distance from the relocation detection means is within a certain range, the response time becomes a predetermined time or less, and in that case, the machine can be operated. Therefore, since the machine can be moved within a certain range, it is possible to change the layout of the machine on the floor.

  Further, in the first aspect, the machine includes a machine storage unit that stores individual identification information, and the relocation detection unit includes an identification information storage unit that stores the identification information, and the communication unit performs the communication via the communication unit. The identification information matching judgment means for judging whether or not the identification information stored in the machine storage means and the identification information stored in the identification information storage means match, and the identification information matching judgment means Only when it is determined that they match each other, an operation permission unit that permits the operation of the machine may be provided. The identification information match determination means determines whether or not the identification information stored in the machine storage means matches the identification information stored in the identification information storage means via the communication means. The operation permission means permits the machine to operate only when it is determined that the identification information matches each other. Machines whose identification information does not match each other may be a machine that illegally communicates with the relocation detection means, so that the operation of such machines can be prohibited.

  Further, in the first aspect, the relocation detection means includes an input / output unit connectable to the plurality of machines, and the response time detection means is provided for each of the plurality of machines connected to the input / output unit. The response time may be detected, and the operation prohibiting unit may prohibit the operation of only a machine that requires the response time exceeding the predetermined time by the response time determining unit. The relocation detection means can be connected to a plurality of machines by the input / output unit. One transfer detection means can detect the transfer of a plurality of machines. Even a machine connected to the input / output unit cannot be operated unless the identification information matches and the response time is within a predetermined time. Therefore, even when a plurality of machines are connected to the input / output unit, it is possible to prohibit the operation of the machines that have been moved at a distance that exceeds a predetermined response time.

  Further, in the first aspect, the operation prohibiting unit may prohibit all operations of the plurality of machines connected to the input / output unit when the transfer detecting unit detects the transfer of the machine casing. . The relocation of the machine frame means that the relocation detection means has been relocated illegally. Therefore, unauthorized use of the machine can be reliably prevented by prohibiting the operation of all machines connected to the input / output unit.

  In the first aspect, the relocation detecting means includes a converter that converts an AC power source into a DC power source, and the converter converts the AC power source independent of the power source of the machine into a DC power source to convert the relocation source. You may make it drive a detection means. Since an independent AC power source can be used after being converted to a DC power source, the transfer detecting means can be provided apart from the machine.

  In the first aspect, the relocation detection means includes an auxiliary battery that performs power backup of the relocation detection means, an abnormality detection means that detects an abnormality of the converter, and the abnormality detection means that detects the abnormality. And a switching means for switching so that the power of the auxiliary battery is supplied to the relocation detecting means from the DC power source converted by the converter. When the abnormality detection means detects an abnormality, the switching means switches so that the power of the auxiliary battery is supplied to the relocation detection means from the DC power converted by the converter. Therefore, the relocation detection means can use the power source of the auxiliary battery even when a situation where the AC power source cannot be used occurs.

  In the first aspect, the relocation detecting means supplies an abnormality detecting means for detecting an abnormality of the converter, and supplies power of the machine to the relocation detecting means when the abnormality detecting means detects the abnormality. You may provide a power supply means and the abnormality notification means which alert | reports abnormality to the said machine when the power supply of the said machine is supplied to the said movement detection means by the said power supply means. The power supply means supplies the machine power to the relocation detection means when the abnormality detection means detects an abnormality. Therefore, the relocation detection means can use the power source of the machine even if the converter is abnormal. When there is an abnormality in the converter, the abnormality notifying means notifies the machine of the abnormality, so that the operator can recognize that the converter has an abnormality on the machine side.

  In the first aspect, the relocation detection means further includes auxiliary battery supply detection means for detecting whether or not the auxiliary battery is supplied with power, and the operation prohibiting means is configured such that the auxiliary battery supply detection means does not supply power. If this is detected, the operation of the machine may be prohibited. When the auxiliary battery is not supplied with power, the relocation detecting means cannot detect the relocation of the machine casing. In such a case, since the operation of the machine can be prohibited, unauthorized use of the machine can be surely prevented.

1 is a conceptual diagram showing a configuration of a relocation detection system 100. FIG. It is a block diagram which shows the electrical structure of 1 A of numerical control apparatuses, and the moving detection apparatus. It is a figure which shows the mechanism of switching of the power supply in the transfer detection apparatus. 3 is a conceptual diagram showing various storage areas of a flash memory 24. FIG. FIG. 5 is a conceptual diagram showing storage contents of a unique ID storage area 241. 2 is a block diagram showing a configuration of a communication distance measurement circuit 11. FIG. It is a flowchart of a unique ID registration request process. It is a flowchart of a unique ID registration process. It is a flowchart of a relocation detection process. It is a flowchart of a starting determination process. It is a flowchart of a unique ID transmission process. It is a flowchart of a power supply switching process. It is a flowchart of a battery exhaustion detection process. It is a timing chart which showed the measuring method of propagation time. It is a figure which shows the mechanism of switching of the power supply in the moving detection apparatus 220. FIG.

  Hereinafter, a relocation detection system 100 according to an embodiment of the present invention will be described with reference to the drawings.

  First, the configuration of the relocation detection system 100 will be described with reference to FIG. The relocation detection system 100 includes three numerical control devices 1A, 1B, and 1C and one relocation detection device 20. The relocation detection device 20 includes a relocation detector 25 (see FIG. 2) that detects vibration and detects relocation of the relocation detection device 20. Each of the numerical control devices 1A to 1C is provided in a machine tool (not shown), and controls the operation of the machine tool (not shown in FIG. 1) by executing an NC program. The numerical control devices 1A, 1B, and 1C are connected to the relocation detection device 20 via wirings 11A, 11B, and 11C. Therefore, the relocation detection device 20 can communicate with the numerical control devices 1A to 1C. The machine casing 201 that houses the transfer detection device 20 is fixed to a pillar 91 that stands on the floor of the factory.

  Since the numerical control devices 1A to 1C operate normally as long as they are within the reach of the wirings 11A to 11C, they can move in the same floor. Therefore, the worker can change the arrangement of the numerical control devices 1A to 1C in the same floor.

  Next, the electrical configuration of the numerical controller 1A will be described with reference to FIG. Since the electrical configurations of the numerical control devices 1B and 1C are the same as those of the numerical control device 1A, the description thereof is omitted. The numerical controller 1A includes a CPU 5, a ROM 6, a RAM 7, a flash memory 8, an input / output interface 9, an AC / DC converter 10, a communication distance measuring circuit 11, and an interface module 12 (hereinafter referred to as an I / F module 12). ) Etc.

  In addition to the main program, the ROM 6 stores a unique ID registration request program, an activation determination program, and the like which will be described later. The unique ID registration request program and the activation determination program may be stored in a flash memory, EEPROM, HDD, or the like as a computer-readable storage medium. The flash memory 8 stores at least a unique ID that is unique identification information of the numerical control device 1A and a reference communication distance that is a reference of a communication distance between the relocation detection device 20 and the numerical control device 1A. As will be described later, the reference communication distance is calculated by the CPU 5 when the relocation detection system 100 is installed.

  The input / output interface 9 is connected to a drive unit (not shown) and an operation panel (not shown) of the machine tool 15. The AC / DC converter 10 is connected to an external AC power supply 16 and converts AC supplied from the AC power supply 16 into DC. In addition to the AC power supply 16, the AC / DC converter 10 is connected to a relocation detection interface 33 (hereinafter referred to as relocation detection I / F 33) of the relocation detection device 20. The communication distance measurement circuit 11 measures the communication distance between the numerical control device 1A and the relocation detection device 20. The I / F module 12 is connected to the relocation detection I / F 33 of the relocation detection device 20.

  Next, the electrical configuration of the relocation detection device 20 will be described with reference to FIG. The relocation detection device 20 includes a CPU 21, ROM 22, RAM 23, flash memory 24, relocation detector 25, abnormal voltage detection circuit 26, switch drive circuit 27, battery 28 as an auxiliary battery, signal return circuit 29, and AC / DC converter 32. The relocation detection I / F 33 is provided at least. The ROM 22 stores at least a unique ID registration program, a relocation detection program, a unique ID transmission program, a power supply switching program, a battery exhaustion detection program, and the like which will be described later. The unique ID registration program, relocation detection program, unique ID transmission program, power switch program, and battery exhaustion detection program may be stored in a flash memory, EEPROM, HDD, or the like as a computer-readable storage medium. After power-on, the CPU 21 performs parallel processing of a unique ID registration program, a relocation detection program, a unique ID transmission program, and a power supply switching program.

  The relocation detector 25 detects vibration of the main body 201 and detects relocation of the relocation detection device 20. As a method for detecting relocation, for example, acceleration, inclination, etc. may be detected in addition to vibration. The abnormal voltage detection circuit 26 detects an abnormality in the output of the AC / DC converter 32. The switch drive circuit 27 opens and closes switches 41 to 43 (see FIG. 3) described later according to the detection result of the abnormal voltage detection circuit 26. For example, when the distance measurement signal output from the numerical controller 1A is received, the signal return circuit 29 returns the distance measurement signal to the numerical controller 1A. The AC / DC converter 32 is connected to an external AC power supply 35 and converts the AC supplied from the AC power supply 35 into a DC. The relocation detection I / F 33 is connected to the I / F module 12 of the numerical controller 1A and the AC / DC converter 10 of the numerical controller 1A. Therefore, the relocation detection device 20 can communicate with the numerical control device 1A. The same applies to the numerical controllers 1B and 1C.

  Next, the power supply path of the relocation detection device 20 will be described with reference to FIG. A switch 41 is provided in the middle of the power supply line connecting the CPU 21 and the AC / DC converter 32. A switch 42 is provided in the middle of the power supply line connecting the CPU 21 and the relocation detection I / F 33. A switch 43 is provided in the middle of the power supply line connecting the CPU 21 and the battery 28. The switch drive circuit 27 opens and closes the switches 41, 42, and 43 based on instructions from the CPU 21. When the switch 41 is closed, the relocation detection device 20 can use the direct current output from the AC / DC converter 32. When the switch 42 is closed, the relocation detection device 20 can use the direct current output from the AC / DC converter 10 of the numerical control device 1A via the relocation detection I / F 33. When the switch 43 is closed, the relocation detection device 20 can use the direct current output from the battery 28. The CPU 21 controls switching of the switches 41 to 43 based on the detection result of the abnormal voltage detection circuit 26.

  Next, various storage areas of the flash memory 24 will be described with reference to FIG. The flash memory 24 includes at least a unique ID storage area 241, a relocation history storage area 242, and a relocation non-detection flag storage area 243. The unique ID storage area 241 stores the unique IDs of the numerical control devices 1A to 1C connected to the relocation detection I / F 33. The relocation history storage area 242 stores relocation detection information such as the date and time when relocation of the relocation detector 25 is detected. The operator can display the relocation detection information on a screen provided on the operation panel of the machine tool 15 by operating the operation panel. The relocation non-detection flag storage area 243 stores a relocation non-detection flag indicating the presence or absence of relocation detection of the relocation detector 25. When the relocation detector 25 has not detected relocation, the CPU 21 stores a relocation non-detection flag = “1” in the relocation non-detection flag storage area 243 (see FIG. 4). When the relocation is detected, the CPU 21 stores a relocation non-detection flag = “0” in the relocation non-detection flag storage area 243.

  Next, the unique ID stored in the unique ID storage area 241 will be described with reference to FIG. When the machine tool manufacturer installs the numerical control devices 1A to 1C in the factory, the machine tool manufacturer registers the unique ID of the numerical control devices 1A to 1C in the relocation detection device 20 from the operation panel of the numerical control devices 1A to 1C. The registered unique ID is stored in the unique ID storage area 241 of the flash memory 24 of the relocation detecting device 20.

  The relocation detection I / F 33 has a plurality of connection terminals (not shown) for connecting the numerical control device. An address is assigned to the connection terminal. In the example illustrated in FIG. 1, the I / F modules 12 of the three numerical control devices 1 </ b> A to 1 </ b> C are connected to the relocation detection I / F 33 of the relocation detection device 20. As illustrated in FIG. 4, the unique ID storage area 241 stores the unique IDs of the numerical control devices 1 </ b> A to 1 </ b> C for the A addresses starting with “A” of the four connection terminals in the relocation detection I / F 33. The CPU 21 can recognize which connection terminal the numerical control devices 1A to 1C are connected to. The fourth address that is not connected to the numerical control device has no unique ID stored therein and is in an empty state.

  Next, the communication distance measuring circuit 11 of the numerical controller 1A will be described with reference to FIG. The communication distance measurement circuit 11 includes a comparator 45 and an FPGA 56 that is an integrated circuit. The FPGA 56 includes a time measurement circuit 57 and a communication distance calculation circuit 58. The input terminal 1 (“input 1” in FIG. 6) and the input terminal 2 (“input 2” in FIG. 6) of the comparator 45 are connected to the I / F module 12. A distance measurement signal output from the time measurement circuit 57 is input to the input terminal 1. A distance measurement signal returned by the signal return circuit 29 of the relocation detection device 20 is input to the input terminal 2.

  The output terminal of the comparator 45 is connected to the time measurement circuit 57 of the FPGA 56. The output terminal outputs a difference between the voltage input to the input terminal 1 and the voltage input to the input terminal 2. The time measurement circuit 57 is connected to the communication distance calculation circuit 58 in the middle of the path connecting the input terminal 1 of the comparator 45 and the I / F module 12. A resistor 46 is provided in a path connecting the input terminal 1 of the comparator 45 and the I / F module 12. A resistor 47 is provided in a path connecting the input terminal 2 of the comparator 45 and the I / F module 12.

  Next, the activation restriction of the numerical control apparatuses 1A to 1C in the relocation detection system 100 will be described with reference to the flowcharts of FIGS. In this system, in addition to the case where the relocation detector 25 detects relocation, when the unique ID of the numerical control device is not registered in the relocation detection device 20, activation of the numerical control devices 1A to 1C is prohibited. In the following description, the processing executed by the CPU 5 of the numerical control device 1A and the processing executed by the CPU 21 of the relocation detection device 20 will be described along the operation flow of this system.

<When installing a numerical controller>
When a machine tool manufacturer installs a machine tool equipped with the numerical control device 1A in a factory, the machine tool manufacturer performs an operation of registering the unique ID of the numerical control device 1A in the transfer detection device 20 on the operation panel of the machine tool 15. The machine tool manufacturer inputs a write command (password) and registers the unique ID. The write command is known only to the machine tool manufacturer. An input operation on the operation panel is input to the numerical controller 20. This process is executed by calling the unique ID registration request program stored in the ROM 6 when transmitting the unique ID of the numerical controller 1A.

  The unique ID registration request process executed by the CPU 5 of the numerical controller 1A will be described with reference to the flowchart of FIG. When the machine tool manufacturer performs a unique ID registration operation on the operation panel, the unique ID write command and the unique ID stored in the flash memory 8 (see FIG. 2) are transmitted to the relocation detection device 20 (S1). ). The relocation detection device 20 that has received the write command and the unique ID stores the received unique ID and returns an OK signal to the numerical control device 1A if the write command is correct. If the write command is not correct, an NG signal is returned.

  Next, it is determined whether an OK signal is received from the relocation detection device 20 (S2). When an OK signal is not received (S2: NO), it is determined whether an NG signal is received (S6). If an NG signal is received (S6: YES), the process is terminated as it is. Until an OK signal or an NG signal is received (S2: NO, S6: NO), a standby state is entered.

  When the OK signal is received (S2: YES), the unique ID is normally registered in the relocation detection device 20. Next, in order to measure the communication distance between the numerical controller 1 </ b> A and the relocation detection device 20, in the communication distance measurement circuit 11 shown in FIG. 6, a distance measurement signal is sent from the time measurement circuit 57 to the relocation detection device 20. Is transmitted (S3). Simultaneously with the transmission of the distance measurement signal, time measurement is started.

  As shown in FIG. 6, when a distance measurement signal is transmitted from the time measurement circuit 57, a predetermined voltage signal is input to the input terminal 1 of the comparator 45 at the same time. The distance measurement signal reaches the signal return circuit 29 via the I / F module 12 and the relocation detection I / F 33 of the relocation detection device 20. The signal return circuit 29 returns a distance measurement signal to the numerical controller 1A.

  The CPU 5 determines whether or not a distance measurement signal has been received (S4). As shown in FIG. 14, the output of the comparator 45 until the distance measurement signal is transmitted and returned is the voltage input at the input terminal 1. Until the distance measurement signal is received (S4: NO), the process returns to S4 and enters a standby state. The distance measurement signal is input to the input terminal 2 of the comparator 45 via the I / F module 12 of the numerical controller 20. When the distance measurement signal is input to the input terminal 2, the comparator 45 subtracts the voltage input to the input terminal 2 from the voltage input to the input terminal 1. The output of the comparator 45 becomes zero. The time when the output of the comparator 45 is a predetermined value is counted by the time measurement clock. Therefore, the CPU 21 can calculate the propagation time of the distance measurement signal.

Next, returning to the flow of FIG. 7, since the distance measurement signal is received (S4: YES), the communication distance between the numerical control device 1A and the relocation detection device 20 is calculated based on the calculated propagation time. The calculated communication distance is stored in the flash memory 8 (see FIG. 2) as a reference communication distance (S5). For example, when the wirings 11A to 11C are coaxial cables and the propagation speed is 180 (mm / ns), the communication distance is calculated by the following equation.
・ Communication distance L = 180 (mm) × [propagation time (ns) / 2]
When the propagation time is 1000 ns, the length of the coaxial cable is L = 180 × (1000/2) = 90 (m). This value is the reference communication distance. The relocation detection system 100 can determine that it is abnormal when the length of the wiring changes by using the length of the wiring when the numerical control apparatus 1A is installed as a reference.

  Next, the unique ID registration process executed by the CPU 21 of the relocation detection device 20 will be described with reference to the flowchart of FIG. This process is executed by calling the unique ID registration program stored in the ROM 22 when the relocation detection device 20 is installed and the power is turned on. First, it is determined whether or not a write command and a unique ID are received from the numerical controller 1A (S11). Until a write command and a unique ID are received (S11: NO), a standby state is entered. When the write command and the unique ID are received (S11: YES), it is determined whether or not the received write command is correct (S12). If the write command is incorrect (S12: NO), the received unique ID is not stored, and an NG signal is transmitted to the numerical controller 1A (S17), and the process is terminated. Therefore, another person who does not know the writing command cannot register the unique ID.

  If the write command is correct (S12: YES), the unique ID is stored in the unique ID storage area 241 (see FIGS. 4 and 5) of the flash memory 8 (S13). At this time, “1” is stored in the relocation non-detection flag storage area 243 of the flash memory 24. The write command and the unique ID are received via the connection terminal of the relocation detection I / F 33. The received unique ID is stored for the address assigned to the terminal to which the numerical controller 1A is connected.

  Next, it is determined whether or not a distance measurement signal is received from the numerical controller 1A (S15). Until the distance measurement signal is received (S15: NO), the process returns to S15 and enters a standby state. When the distance measurement signal is received (S15: YES), as described above, the distance measurement signal is returned from the signal return circuit 29 to the numerical controller 1A (S16). Thus, the unique ID registration process of the relocation detection device 20 is completed.

<Relocation detection by the relocation detector 25>
When attempting to relocate the numerical control devices 1A to 1C, it is assumed that the relocation detection device 20 is relocated because the numerical control devices 1A to 1C are connected by the wirings 11A to 11C. In order to prevent such relocation, relocation detection by the relocation detector 25 is executed.

  The relocation detection process by the CPU 21 of the relocation detection device 20 will be described with reference to the flowchart of FIG. This process is executed when the power supply is turned on and the relocation detection program stored in the ROM 22 is called. First, the relocation non-detection flag = “1” is stored in the relocation non-detection flag storage area 243 (see FIG. 4) of the flash memory 24 (S18). Next, it is determined whether or not relocation is detected by the relocation detector 25 (S19). Until the relocation is detected (S19: NO), the process returns to S19 and enters a standby state. When relocation is detected (S19: YES), relocation non-detection flag = “0” is stored in relocation non-detection flag storage area 243 (see FIG. 4) (S20). Next, all the unique IDs stored in the unique ID storage area 241 of the flash memory 24 are deleted (S21), and the process ends.

  As will be described later, the numerical control devices 1A to 1C cannot be activated if their own unique ID is not stored in the relocation detection device 20 to which they are directly connected. Therefore, when the relocation detection device 20 is relocated, the activation of the numerical control devices 1A to 1C can be prohibited. The fact that the relocation detection device 20 has been relocated is stored in the relocation history storage area 242 (see FIG. 4) of the flash memory 24.

<When the numerical controller is turned on: When starting the numerical controller>
The factory worker turns on the power to activate the numerical controller. The numerical controller is powered by the machine tool control panel. In the numerical control device, it is determined whether or not to start when the power is turned on.

  The activation determination process executed by the CPU 5 of the numerical controller 1A will be described with reference to the flowchart of FIG. This process is executed when the activation determination program stored in the ROM 6 is called when the power is turned on. First, a unique ID sending request signal is transmitted to the relocation detection device 20 (S24). This is for confirming whether its own unique ID is stored in the relocation detection device 20. The transmission request signal is a command for requesting transmission for all unique IDs registered in the relocation detection device 20. When the relocation detection device 20 receives the sending request signal, it transmits all the unique IDs stored in the unique ID storage area 241 (see FIG. 5) of the flash memory 24 to the numerical control device 1A. If the unique ID is not stored, an error signal is transmitted.

  It is determined whether the time elapsed since the transmission request signal was transmitted is timed out (S25). In the case of timeout (S25: YES), since there is some abnormality in the relocation detection device 20 or the wiring, the activation is prohibited (S38), and the process is terminated.

  On the other hand, if it has not yet timed out (S25: NO), it is determined whether an error signal has been received or a unique ID has been received (S26, S27). Until an error signal or unique ID is received (S26: NO, S27: NO), the process returns to S25 and the process is repeated. When the error signal is received (S26: YES), the relocation detection device 20 does not store the unique ID. In this case, since there is a possibility that the numerical control device 1A is illegally connected to the relocation detection device 20, the activation is prohibited (S38), and the process is terminated.

  When the unique ID is received before the time-out (S27: YES), it is determined whether or not the received unique ID includes its own unique ID (S28). When there is no own unique ID (S28: NO), there is a possibility that the numerical control device 1A is illegally connected to the relocation detection device 20. Therefore, the activation is prohibited (S38), and the process is terminated.

  On the other hand, if the received unique ID is its own unique ID (S28: YES), a distance measurement signal is transmitted toward the relocation detection device 20 in order to measure the communication distance (S29). Simultaneously with the transmission of the distance measurement signal, time measurement is started (S30). As described above, the relocation detection device 20 returns the received distance measurement signal to the numerical control device 1A. On the other hand, it is determined whether or not a distance measurement signal is received from the relocation detection device 20 (S31). Until a distance measurement signal is received (S31: NO), it is determined whether or not a timeout has occurred (S37). If it is not time-out (S37: NO), the process returns to S31, and the process is on standby until a distance measurement signal is received. In the case of timeout (S37: YES), since the distance measurement signal is not returned from the relocation detection device 20, there is a reason that the wiring 11A is improperly extended or disconnected, or that there is some abnormality in the relocation detection device 20. Conceivable. In this case, the numerical control apparatus 1A is prohibited from starting (S38), and the process ends.

  On the other hand, when the distance measurement signal transmitted from the relocation detection device 20 is received (S31: YES), the time measurement is completed (S32), and the propagation time of the distance measurement signal is calculated. Based on the calculated propagation time, a communication distance is calculated (S33). The calculated communication distance is compared with the reference communication distance stored in the flash memory 8 (S34). It is determined from the comparison result whether the communication distance is normal (S35). If the calculated communication distance is the same as the reference communication distance measured at the time of installation, the wires 11A are connected. Since the communication distance is normal (S35: YES), the normal activation mode is set to activate the numerical control apparatus 1A (S36), and the process is terminated. Activation of the numerical control device 1A is permitted only in the normal activation mode.

  On the other hand, when the calculated communication distance is not the same as the reference communication distance (S35: NO), there is a possibility that another wiring having a different length has been replaced or that communication is being performed via another communication network. In such a case, there is a possibility that the numerical control apparatus 1A has been relocated, so that the numerical control apparatus 1A is prohibited from starting (S38), and the process ends. Accordingly, it is possible to prohibit activation of a numerical control apparatus that may have been moved illegally.

  Next, the unique ID transmission process executed by the CPU 21 of the relocation detection device 20 will be described with reference to the flowchart of FIG. This process is executed when the unique ID transmission program stored in the ROM 22 is called when the power of the relocation detection apparatus 20 is turned on. First, it is determined whether or not “0” is stored in the relocation non-detection flag storage area 243 (see FIG. 4) of the flash memory 24 (S40). If “0” is stored (S40: YES), it is then determined whether or not a unique ID sending request signal has been received from the numerical controller (S47). When the sending request signal is not received (S47: NO), a standby state is entered. When the transmission request signal is received (S47: YES), since the vibration of the relocation detection device 20 is detected, there is a possibility that the relocation detection device 20 has been relocated illegally. In this case, an error signal is transmitted to the numerical controller (S46).

  When “1” is stored in the relocation non-detection flag storage area 243 (see FIG. 4) (S40: NO), at least relocation has not been detected. Therefore, it is determined whether or not a unique ID sending request signal has been received from the numerical controller (S41). When the sending request signal is not received (S41: NO), the process is finished as it is.

  When the unique ID sending request signal is received from the numerical controller (S41: YES), it is determined whether or not the unique ID is stored in the unique ID storage area 241 (see FIG. 5) of the flash memory 24 (S42). ). If no unique ID is stored (S42: NO), an error signal is transmitted to the numerical controller (S46), and the process is terminated.

  When the unique ID is stored in the unique ID storage area 241 (S42: YES), all the stored unique IDs are transmitted to the numerical controller (S43). As described above, the numerical control devices 1A to 1C confirm whether or not the received unique ID has its own unique ID. If there is its own unique ID, a distance measurement signal is transmitted to the relocation detection apparatus 20 as described above in order to confirm whether the communication distance is normal.

  Next, it is determined whether or not a distance measurement signal has been received from the numerical controller (S44). If no distance measurement signal has been received (S44: NO), a standby state is entered. When the distance measurement signal is received (S44: YES), the distance measurement signal is returned from the signal return circuit 29 to the numerical control device (S45), and the process ends.

  Next, power supply switching processing by the CPU 21 of the relocation detection device 20 will be described with reference to FIG. 3 and a flowchart of FIG. This process is executed when the power supply switching program stored in the ROM 22 is called up when the relocation detection apparatus 20 is powered on. First, it is determined whether or not the output voltage of the AC / DC converter 32 is normal (S51). The AC / DC converter 32 changes the alternating current supplied from the alternating current power supply 35 into a direct current and outputs the direct current. The output voltage of the AC / DC converter 32 is detected by the abnormal voltage detection circuit 26. When the output voltage of the AC / DC converter 32 is normal (S51: YES), the switch 41 is turned on, the switch 42 is turned off, and the switch 43 is turned off (S52). In this case, power is supplied from the AC power supply 35 to the relocation detection device 20. Next, returning to S51, the output voltage of the AC / DC converter 32 is continuously monitored.

  When the AC power supply 35 is broken, the output voltage of the AC / DC converter 32 changes. If there is such a voltage abnormality (S51: NO), it is subsequently determined whether or not the output voltage of the AC / DC converter 10 is normal (S53). The AC / DC converter 10 changes the alternating current supplied from the alternating current power supply 16 of the numerical control apparatus 1A into a direct current and outputs the direct current. The output voltage of the AC / DC converter 10 is detected by the abnormal voltage detection circuit 26. When the output voltage of the AC / DC converter 10 is normal (S53: YES), the switch 41 is turned off, the switch 42 is turned on, and the switch 43 is turned off (S54). In this case, power is supplied to the relocation detection device 20 via the AC power supply 16, the AC / DC converter 10, the I / F module 12, and the relocation detection I / F 33. Thereby, even when the AC power supply 35 cannot be used, the AC power supply 16 of the numerical control device can be used and the relocation detection device 20 can be operated. Then, an abnormal signal is transmitted to the numerical control apparatus 1A (S55), and the process ends. In the numerical control apparatus 1A to which the abnormality signal is transmitted, it is displayed that there is an abnormality on the screen of the operation panel. Since the worker can recognize the abnormality of the AC power supply 35 of the relocation detection device 20, a quick response is possible.

  On the other hand, for example, when the power source of the numerical control device 1A is turned off at night, power cannot be supplied from the AC power source 16. In this case, assuming that the output voltage of the AC / DC converter 10 is abnormal (S53: NO), the switch 41 is turned off, the switch 42 is turned off, and the switch 43 is turned on (S56). The battery 28 supplies power to the relocation detection device 20. Thereby, even when AC power supplies 16 and 35 cannot be used, the battery 28 can be used, so that the relocation detection device 20 can be operated. And an abnormal signal is transmitted with respect to a numerical control apparatus (S55), and a process is complete | finished.

  The relocation detection device 20 normally uses power from the AC power source 35, but cannot supply power if the AC power source 35 is broken. In such a case, it is possible to switch to the AC power source 16 used by the numerical controller 1A. Thereby, even in a state where the AC power supply 35 is broken and cannot be used, as described above, it is possible to execute a process for restricting the activation of the numerical control devices 1A to 1C. Furthermore, since the power supplied from the battery 28 can be used even when the AC power supply 16 of the numerical control devices 1A to 1C cannot be used, the process by the relocation detection device 20 can be executed reliably.

  Next, the battery exhaustion detection process by the CPU 21 of the relocation detection device 20 will be described with reference to the flowchart of FIG. When the switch 43 shown in FIG. 3 is turned on, the battery exhaustion detection process is executed by calling up the battery exhaustion detection program stored in the ROM 22. First, it is determined whether the voltage of the battery 28 is less than a predetermined value and the battery is dead (S61). While the battery is not exhausted (S61: NO), the process returns to S61 and enters a standby state. If the battery is dead (S61: YES), all the unique IDs stored in the unique ID storage area 241 (see FIG. 5) of the flash memory 24 are deleted (S62), and the process is terminated. As described above, since all the unique IDs are deleted, the activation of the numerical control devices 1A to 1C can be prohibited when the battery 28 has run out and the relocation detection device 20 cannot operate.

  As described above, in the relocation detection system 100 according to the present embodiment, the numerical control device is illegally relocated by prohibiting the start of the numerical control device in a situation where there is a high possibility that it has been relocated. Can be reliably prevented. In this system, a plurality of numerical control devices 1A to 1C are connected to one transfer detection device 20 by wirings 11A to 11C. A single relocation detection device 20 can monitor a plurality of numerical control devices 1A to 1C. The numerical control devices 1 </ b> A to 1 </ b> C can be rearranged as long as the wirings 11 </ b> A to 11 </ b> C are within reach. The relocation detection device 20 stores the unique IDs of the numerical control devices 1A to 1C when installed in a factory. When the numerical control devices 1A to 1C are activated, it is determined whether or not their own unique ID is stored in the relocation detection device 20. If there is no own unique ID, there is a high possibility that the numerical control device is illegally connected.

  When the relocation detection device 20 is relocated illegally, the relocation of the relocation detection device 20 is detected by detecting the vibration. When the relocation is detected, an error signal is transmitted to the numerical control device, thereby prohibiting activation of the numerical control device. Even when its own unique ID is stored in the relocation detection device 20, there is a possibility that it is replaced with another wiring or communicating using another communication network. Therefore, the communication distance between the relocation detection device 20 and the numerical control devices 1A to 1C is measured and compared with the reference communication distance. If it is not the same as the reference communication distance, it is abnormal and the activation of the numerical control device is prohibited. In this way, it is possible to prevent any situation that is likely to be relocated, and to change the arrangement of the numerical control device within a certain range, so that it is possible to provide a relocation detection system 100 that is highly safe and easy to use. .

  In the above description, the numerical control devices 1A to 1C correspond to the “machine” of the present invention, the relocation detection device 20 corresponds to the “relocation detection means” of the present invention, and the wires 11A to 11C correspond to the “communication means” of the present invention. It corresponds to. The flash memory 8 corresponds to the “machine storage unit” of the present invention, the unique ID storage area 241 of the flash memory 24 corresponds to the “identification information storage unit” of the present invention, and the relocation detection I / F 33 corresponds to the “input” of the present invention. The AC / DC converter 32 corresponds to the “converter” of the present invention, the battery 28 corresponds to the “auxiliary battery” of the present invention, and the abnormal voltage detection circuit 26 corresponds to the “abnormality” of the present invention. It corresponds to “detection means”.

  Further, the CPU 5 that executes the process of S28 in FIG. 10 and the CPU 21 that executes the process of S42 in FIG. 11 correspond to “identification information coincidence determining means” of the present invention. The CPU 5 that executes the processing of S29 to S33 in FIG. 10 corresponds to the “response time detection means” of the present invention, and the CPU 5 that executes the processing of S35 corresponds to the “response time determination means” of the present invention, and the processing of S36 The CPU 5 that executes the process corresponds to the “operation permission unit” of the present invention, and the CPU 5 that executes the process of S38 corresponds to the “operation prohibition unit” of the present invention.

  The CPU 21 that executes the process of S56 in FIG. 12 corresponds to the “switching means” of the present invention, and the CPU 21 that executes the process of S54 corresponds to the “power supply means” of the present invention, and executes the process of S55. The CPU 21 corresponds to “notification means” of the present invention. The CPU 21 that executes the process of S61 in FIG. 13 corresponds to the “auxiliary battery supply detecting means” of the present invention.

  In addition, it cannot be overemphasized that the transfer detection apparatus of this invention and the machine tool provided with the said transfer detection apparatus are not restricted to the said embodiment but various deformation | transformation is possible. For example, in the above embodiment, as shown in FIG. 3, the power supply in the relocation detection device 20 is provided by providing switches 41 to 43 on three power supply lines and controlling the opening and closing of the switches 41 to 43. The power supply source is switched. In addition, for example, as shown in FIG. 15, a diode 81 may be provided instead of the switch 41, a diode 82 may be provided instead of the switch 42, and a diode 80 may be provided instead of the switch 43.

  In this case, the voltage of the AC power source 35 is set highest, and the AC power source 16 and the battery 28 are decreased in this order. Since current flows from the AC power supply 35 having the highest voltage, the current flowing from the AC power supply 35 can be used in a normal state. When no current flows from the AC power supply 35, a current flows from the AC power supply 16 having the next highest voltage toward the transfer detection device 220. Furthermore, when the current supplied from the AC power supply 16 is also stopped, the current flowing from the battery 28 can be used. That is, the same effect as the above embodiment can be obtained.

  In the above embodiment, when the abnormal voltage detection circuit 26 detects an abnormality in the output voltage of the AC / DC converter 32, the switch 42 (see FIG. 12: S54) is turned on to turn on the numerical controller 1A. Although the power of the AC power supply 16 is used, the switch 43 may be turned on (S56 in FIG. 12) to directly use the power of the battery 28.

  In the above embodiment, the communication distance between the numerical control device and the relocation detection device is measured, and the activation of the numerical control device is determined based on whether or not the communication distance is normal. It may be determined depending on whether or not this is the case.

1A, 1B, 1C Numerical control device 11A to 11C Wiring 5 CPU
6 ROM
8 Flash Memory 9 Input / Output Interface 10 Converter 11 Communication Distance Measuring Circuit 15 Machine Tool 16 AC Power Supply 20 Relocation Detection Device 21 CPU
22 ROM
24 Flash memory 25 Relocation detector 26 Abnormal voltage detection circuit 27 Switch drive circuit 28 Battery 29 Signal return circuit 32 AC / DC converter 33 Relocation detection I / F
35 AC power supply 41 switch 42 switch 43 switch 58 communication distance calculation circuit 45 comparator 81 diode 82 diode 83 diode 100 relocation detection system

Claims (8)

In a relocation detection system comprising relocation detection means for detecting relocation of a machine, and operation prohibiting means for prohibiting operation of the machine when the relocation detection means detects relocation of the machine,
A machine frame for storing the transfer detecting means is provided separately from the machine,
Response time detection means for detecting response time required for communication with the machine by communication means for communicating the relocation detection means and the machine;
Response time determination means for determining whether or not the response time detected by the response time detection means exceeds a predetermined time;
The relocation detection system, wherein the operation prohibiting unit prohibits the operation of the machine when the response time determining unit determines that the response time exceeds the predetermined time. The machine includes machine storage means for storing individual identification information,
The relocation detection means includes identification information storage means for storing the identification information,
Identification information coincidence determining means for determining whether or not the identification information stored in the machine storage means via the communication means matches the identification information stored in the identification information storage means;
2. The operation permission means for permitting the machine to operate only when the identification information matching determination means determines that the identification information matches each other. Relocation detection system. The relocation detection means includes an input / output unit connectable to a plurality of the machines,
The response time detection means detects the response time for each of the plurality of machines connected to the input / output unit,
The relocation detection system according to claim 2, wherein the operation prohibiting unit prohibits the operation of only a machine that requires the response time exceeding the predetermined time by the response time determining unit.   The operation prohibiting unit prohibits all operations of the plurality of machines connected to the input / output unit when the relocation detecting unit detects the relocation of the machine frame. Relocation detection system. The relocation detection means includes a converter for converting from an AC power source to a DC power source,
5. The relocation detection system according to claim 1, wherein the converter converts an AC power supply independent of a power supply of the machine into a DC power supply and drives the relocation detection unit. 6. The relocation detection means includes
An auxiliary battery for backing up the relocation detecting means;
An abnormality detecting means for detecting an abnormality of the converter;
A switching means for switching so that the power of the auxiliary battery is supplied to the relocation detecting means from the DC power converted by the converter when the abnormality detecting means detects the abnormality. 5. The relocation detection system according to 5. The relocation detection means includes
An abnormality detecting means for detecting an abnormality of the converter;
A power supply means for supplying power to the relocation detection means when the abnormality detection means detects the abnormality;
6. The relocation detection system according to claim 5, further comprising a notifying unit for notifying the machine of an abnormality when the power of the machine is supplied to the relocation detection unit by the power supply unit. The relocation detection means further comprises auxiliary battery supply detection means for detecting the presence or absence of power supply of the auxiliary battery,
The relocation detection system according to claim 6, wherein the operation prohibiting unit prohibits the operation of the machine when the auxiliary battery supply detecting unit detects that there is no power supply.

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