JP3186043U - Slave station terminal - Google Patents

Abstract

To provide a slave station terminal capable of reading and writing unique identification information even when a malfunction occurs such that the slave station terminal does not operate normally.
A slave station terminal includes an information adding unit including an electromotive force generating means, a storage means, and an arithmetic processing means that operates with the electromotive force generated by the electromotive force generating means. The unique identification information stored in is exchanged with a separate terminal device 6. Further, the slave station terminal includes an information adding unit 3 including an electromotive force generating means, a storage means, and an arithmetic processing means that operates by the electromotive force generated by the electromotive force generating means, and notifies the response request signal. Make a response.
[Selection] Figure 1

Description

  The present invention reads and writes unique identification information (hereinafter referred to as unique identification information) necessary for transmission of control / monitoring signals to and from the master station via a common data signal line even when a failure occurs. This is related to the slave station terminal that can be used. The common data signal line is a signal line in which a plurality of slave station terminals are connected in parallel, and a master station is connected in parallel to the plurality of slave stations.

  In a control system having a single control unit and a plurality of controlled devices (consisting of a controlled unit that operates in response to an instruction from the control unit and a sensor unit that transmits information to the control unit), the number of wires There is wiring-saving technology to reduce For example, Japanese Patent Laid-Open No. 2002-271878 discloses a control / monitoring signal including a master station connected to a control unit and a data signal line, and a plurality of slave stations connected to the data signal line and a corresponding controlled device. A transmission system is disclosed.

  In the above control / monitor signal transmission system, a signal transmission method in which one (1 bit) control signal or sensor signal (input signal from a controlled device) corresponding to each clock is superimposed on a clock signal line including a power source. Is adopted. On the other hand, since the input / output signals in the control unit and the controlled device are usually in parallel format, it is necessary to convert these parallel format signals into serial format signals. Therefore, a master station that performs parallel / serial conversion of input / output signals in the control unit and a slave station that performs parallel / serial conversion of input / output signals in the controlled device are arranged.

JP 2002-271878 A

  In a conventional system including the control / monitor signal transmission system, unique identification information of each slave station terminal, for example, an address value, is required for signal transmission. Therefore, each conventional slave station terminal is provided with a switch mechanism for mechanically setting unique identification information.

  However, in the current situation where miniaturization of the slave station terminal is required, when the unique identification information is set mechanically, the size of the switch mechanism needs to be miniaturized according to the size of the slave station. There was a problem that it was extremely difficult to see.

  For such a problem, a method has been proposed in which a storage device is mounted on the slave station terminal and the unique identification information is stored in the storage device from the outside or in advance. However, the method of storing the unique identification information in the storage device mounted on the slave station terminal has a problem that the unique identification information cannot be read / written when the slave station terminal does not operate normally.

  Accordingly, an object of the present invention is to provide a slave station terminal that enables reading and writing of unique identification information even when a malfunction occurs that prevents the slave station terminal from operating normally.

  A first slave station terminal according to the present invention includes an information providing unit including an electromotive force generation unit, a storage unit, and an arithmetic processing unit that operates by an electromotive force generated by the electromotive force generation unit, and stores the storage unit. The unique identification information stored in the means is exchanged with a separate terminal device.

  The unique identification information may be delivered to the terminal device in response to a response request signal superimposed on the electromotive force generation medium. The electromotive force generating medium is, for example, light when a solar cell is employed as an electromotive force generating means, magnetic field when an induction coil is employed, and electromagnetic wave when an electric antenna is employed, Each corresponds.

  The second slave station terminal according to the present invention includes an information adding unit including an electromotive force generating unit, a storage unit, and an arithmetic processing unit that operates with the electromotive force generated by the electromotive force generating unit, and requests a response. A notification response to the signal is made. The notification response may be made to the response request signal superimposed on the electromotive force generation medium.

  Even if the first slave station terminal according to the present invention loses the power supply function, only the information providing unit functions by generating the electromotive force by the electromotive force generating means, and the terminal device separate from the slave station terminal. The unique identification information can be read / written. In other words, the unique identification information can be read / written even when a malfunction occurs such that the slave station terminal does not operate normally.

  As a method for reading the unique identification information, a method in which the unique identification information is delivered to the terminal device in response to a response request signal from the terminal device is preferable. When light, magnetism, or electromagnetic waves are employed as the electromotive force generation medium, a response request signal can be superimposed on the electromotive force generation medium.

  In the second slave station terminal according to the present invention, the delivery of unique identification information (read processing by the terminal device) in the first slave station terminal is used as a notification response so that the slave station terminal does not operate normally. Even when a malfunction occurs, the unique identification information can be extracted without using a terminal device separate from the slave station terminal by causing only the information adding unit to function. If light, magnetism, or electromagnetic waves are used as the electromotive force generation medium, a response request signal may be superimposed on the electromotive force generation medium as in the case of the first slave station terminal. it can.

It is a block diagram of the Example of the 1st sub_station | mobile_unit terminal which concerns on this invention. It is a block diagram of the control and monitoring signal transmission system in which the same slave station terminal is used. It is a block diagram of a terminal device. It is a time chart of the response request signal superimposed on the light used as the electromotive force generation medium. It is a block diagram of the other Example of a slave station terminal. It is a block diagram of the terminal device corresponding to the slave station terminal shown in FIG. It is a time chart of the response request signal superimposed on the electromagnetic wave used as the electromotive force generation medium. It is a block diagram of further another embodiment of the slave station terminal. It is a block diagram of the terminal device corresponding to the slave station terminal shown in FIG.

An embodiment of a first slave station terminal according to the present invention will be described with reference to FIGS.
First, the configuration of a control / monitor signal transmission system in which a slave station terminal is used will be described. As shown in FIG. 2, the control / monitor signal transmission system is for controlling a controlled device 1 that is arranged away from the control unit 5. A parent station 4 is connected to the control unit 5, and further, common data signal lines DP and DN (hereinafter referred to as common data signal lines DP and DN) are connected to the parent station 4. Each of the plurality of slave station terminals 2 is arranged corresponding to each controlled device 1 and connected to the common data signal lines DP and DN.

  The control unit 5 is a computer or the like, and includes an output unit 51 that transmits control data 53 and an input unit 52 that receives monitoring data 54 related to the operation of the controlled apparatus 1. The output unit 51 and the input unit 52 are connected to the master station 4.

  The master station 4 hands over the monitoring data 54 of the signals (monitoring data signals) sent from the slave station terminal 2 to the common data signal lines DP and DN to the control unit 5 and a series of pulse signals based on a predetermined timing signal. And sends this signal to the common data signal lines DP and DN. Hereinafter, a series of pulse signals transmitted to the common data signal lines DP and DN are referred to as transmission clock signals.

  The controlled device 1 includes a controlled unit 11 and a sensor unit 12 that monitors the controlled unit 11. Examples of the controlled unit 11 and the sensor unit 12 include, but are not limited to, an actuator and a magnetic sensor that detects the amount of magnetism of a magnet incorporated in a predetermined position of the cylinder rod. Other configurations such as an extraction instruction display and an extraction completion lever on the parts shelf may be employed.

  The slave station terminal 2 includes an MCU 21 that is a microcomputer control unit as an internal circuit, and further includes an information adding unit 3 that operates independently of the MCU 21.

  As shown in FIG. 1, the MCU 21 includes a CPU, a RAM, and a FROM. In the FROM, a program necessary for a series of processing performed in the slave station terminal 2 and the slave station terminal 2 delivered from the information adding unit 3 are provided. Unique identification information such as address information, model information, specification information, etc. is stored. The RAM stores detection data obtained from the sensor unit 12 via the terminal IND. Then, processing for obtaining information necessary for detection is performed using the arithmetic function of the CPU. However, FROM is a rewritable nonvolatile memory.

  The processing in the MCU 21 will be described. First, the addresses assigned for each cycle of the transmission clock signals of the common data signal lines DP and DN input from the input terminal CK are counted. Then, when the data value obtained by the count (hereinafter referred to as an address count value) matches the local station address that is one of the unique identification information, the MCU 21 holds it in the RAM according to the timing of the transmission clock signal. A signal corresponding to the detected data is output from the output terminal OUT to the base of the transistor TR as the superimposition timing of the monitoring data signal of the local station. Specifically, if the detection data is “on” (content indicating that the sensor unit 12 has detected the detection target), the transistor TR is turned on, the current flows, the voltage drops, and the voltage level is 0V. The signal is transmitted to the common data signal lines DP and DN. Further, the MCU 21 outputs a signal corresponding to the control data 53 obtained at the timing of the transmission clock signal whose address count value matches the own station address to the controlled unit 11 via the parallel output terminal OUTD.

  The information providing unit 3 has a MCU 31 as a microcomputer control unit as a core, and includes a solar cell 32 as an electromotive force generating means and a light projecting element 33 as an optical signal transmitting means.

  The solar cell 32 extracts a circuit that supplies the electromotive force generated by the light projection from the terminal device 6 to the MCU 31 via the input terminal Vcm, and a response request signal superimposed on the light projection from the terminal device 6. Are connected to a circuit that is handed over to the MCU 31 via an input terminal CKm. However, since these circuit configurations are known, description thereof will be omitted. The light projecting element 33 is connected to the output terminal LEm of the MCU 31 and emits a light projecting signal.

  The MCU 31 functions as an arithmetic processing unit that operates by the electromotive force of the solar battery 32 and functions as a storage unit that stores unique identification information such as address information, model information, and specification information related to the slave station terminal 2. It has become. Similar to the MCU 21, the CPU includes a RAM, a FROM, and the FROM stores unique identification information and a program necessary for a series of processes for emitting the unique identification information as a projection signal. And when MCU21 does not operate | move normally, the delivery process of the specific identification information to the terminal device 6 is performed using the calculation function of CPU.

  The terminal device 6 to which the unique identification information is transferred from the information providing unit 3 also has a function of writing the unique identification information. That is, the terminal device 6 has a function of reading and writing the unique identification information. As shown in FIG. 3, the light projecting unit 61, the light receiving unit 62, the input unit 63, the display unit 64, and the control thereof. It is comprised by MCU65 which performs. In addition, since these can be comprised by well-known components and a circuit, detailed description is abbreviate | omitted and hereafter, the read / write process of the solid identification information of the slave station terminal 2 using this terminal device 6 is demonstrated. .

  The light projecting unit 61 of the terminal device 6 generates light that is an electromotive force generating medium in the information providing unit 3 of the slave station terminal 2, and the light of the projector unit 61 is used as a solar cell of the slave station terminal 2. By making it enter into 32, the electromotive force for operating MCU31 of the information provision part 3 in the slave station terminal 2 can be generated. At this time, the light projecting unit 61 has intensity of illuminance corresponding to a signal from the output terminal LEC of the MCU 65, and a response request signal representing a data value is superimposed on the intensity.

  FIG. 4 is a time chart of a signal superimposed on the light projection of the light projecting unit 61. When a pulse signal having a voltage value of 2 (expressed as VH and VL in this embodiment) is output to the output terminal LEC, the illuminance of light projection of the light projecting unit 61 corresponds to VH and VL. A pulse signal is formed by the change in illuminance. In the slave station terminal 2, an electromotive force is generated according to the illuminance of the light projection from the light projecting unit 61 incident on the solar cell 32, so that it is superimposed on the light projection based on the voltage value of the electromotive force. A signal can be extracted. The signal data value can be expressed, for example, by changing the duty ratio of one pulse cycle (ratio of the period corresponding to VH and the period corresponding to VL in FIG. 4). In the example of FIG. 4, the data value is shown by associating “1” and “0” in the case of A where the rise of the period corresponding to VH is early and the case of late B, respectively. Note that a pulse signal having a cycle length different from the pulse cycle of the data signal is superimposed as a start signal indicating the start of the data signal before the data signal.

  In the slave station terminal 2, the response request signal extracted from the electromotive force is input to the MCU 31. Then, the MCU 31 performs processing according to this response request signal. Therefore, when writing the unique identification information, if a command indicating a write instruction is input from the input unit 63 and subsequently a data value to be written as the unique identification information in the FROM of the MCU 31 is input, the write instruction is received. In the MCU 31, the subsequent data value is written in the FROM as unique identification information. On the other hand, when reading the unique identification information, a command indicating reading is input from the input unit 63. Upon receiving the read instruction, the MCU 31 transmits a light projection signal including unique identification information from the light projection element 33 via the output terminal LEm. The light receiving unit 62 of the terminal device 6 receives this light projection signal, extracts the unique identification information therefrom, and inputs it to the MCU 65 via the input terminal INC. Since the unique identification information input to the MCU 65 is displayed on the display unit 64, the unique identification information can be confirmed.

  An electromagnetic wave may be employed as the electromotive force generation medium instead of light. FIG. 5 shows an embodiment of a slave station terminal that uses an electromagnetic wave as an electromotive force generating medium and employs an induction coil as an electromotive force generating means. FIG. 6 shows a terminal apparatus corresponding to the slave station terminal shown in FIG. 5 and FIG. 6, the same reference numerals are given to substantially the same parts as those in the embodiment shown in FIGS. 1 to 4, and the description will be omitted or simplified.

  The information providing unit 3 of the slave station terminal 28 includes an induction coil 34 that is an electromotive force generating means. The electromotive force generated in the induction coil 34 by the magnetic field generated by the terminal device 68 is supplied to the MCU 31 via the input terminal Vcm, and a response request signal superimposed on the magnetic field generated by the terminal device 68 is generated. It is extracted and delivered to the MCU 31 via the input terminal CKm.

  Similar to the terminal device 6 shown in FIG. 3, the terminal device 68 corresponding to the slave station terminal 28 has a function of reading and writing the unique identification information. As shown in FIG. The light receiving unit 62, the input unit 63, the display unit 64, and the MCU 65 that controls these units are configured.

  The magnetic field generator 66 generates a magnetic field by a high-frequency voltage that is amplified according to a signal from the output terminal LEC of the MCU 65, and a response request signal that represents a data value is superimposed on the length of the magnetic field generation period. It has become. FIG. 7 is a time chart of signals superimposed on the magnetic field of the magnetic field generator 66. When a high-frequency pulse signal is output from the output terminal LEC, a magnetic field is generated in the magnetic field generator 66. The magnetic field generation period corresponds to the output period of the high-frequency pulse signal from the output terminal LEC. In the induction coil 34 of the slave station terminal 28, an electromotive force is generated by the magnetic field generated by the magnetic field generation unit 66. The voltage that generates this electromotive force is a high-frequency pulse voltage signal as shown in the upper part of FIG. This high-frequency pulse voltage signal is converted into a DC signal by the rectifier circuit 35. Based on this signal, a pulse signal as shown in the lower part of FIG. 7 is obtained and input to the MCU 31 via the input terminal Ckm. The pulse signal input to the MCU 31 is one cycle that is the sum of the magnetic field generation period and the magnetic field non-generation period, and is superimposed on the magnetic field based on the length of the magnetic field generation period (high potential VH period). Signal can be extracted. For example, in the example of FIG. 7, “1” indicates that there is a magnetic field generation period indicated by a broken line (when the magnetic field generation period is long) and “1” indicates that there is no magnetic field generation period indicated by a broken line (when the magnetic field generation period is short). The data value is indicated by corresponding to 0 ″. Note that a pulse signal having a cycle length different from the pulse cycle of the data signal is superimposed as a start signal indicating the start of the data signal before the data signal representing “1” or “0”.

  The response request signal may be delivered independently from the medium for generating electromotive force. FIG. 8 shows an embodiment of a slave station terminal that receives a response request signal in a form independent of an electromotive force generation medium. FIG. 9 shows a terminal device corresponding to the slave station terminal shown in FIG. 8 and 9, the same reference numerals are given to substantially the same parts as those in the embodiment shown in FIGS. 1 to 4 and the embodiment shown in FIGS. 5 to 7, and the description thereof will be omitted or simplified.

  The information providing unit 3 of the slave station terminal 29 includes an induction coil 34 that is an electromotive force generating unit and a light receiving unit 36. The electromotive force generated in the induction coil 34 by the magnetic field generated by the terminal device 69 is supplied to the MCU 31 via the input terminal Vcm. On the other hand, the light receiving means 36 receives a response request signal transmitted as an optical signal from the terminal device 69 and delivers it to the MCU 31 via the input terminal CKm.

  The terminal device 69 corresponding to the slave station terminal 29 has a function of reading and writing the unique identification information, similar to the terminal devices 6 and 68 described above. As shown in FIG. The light receiving unit 62, the input unit 63, the display unit 64, the magnetic field generation unit 66, and the MCU 65 that performs these controls. That is, in addition to the light projecting unit 61 that transmits a response request signal as an optical signal, a response request is provided because the magnetic field generating unit 66 that generates a magnetic field that is an electromotive force generating medium in the information providing unit 3 of the slave station terminal 29 is provided. The signal is delivered to the slave station terminal 29 in a form independent of the electromotive force generation medium.

  In any of the slave station terminals 2, 28, and 29, the unique identification information is handed over to the terminal devices 6, 68, and 69. This is a notification response to the response request signal. Also good. That is, in the information adding unit 3 that has received the response request signal, the MCU 31 collates the unique identification information included in the response request signal with the unique identification information stored in the own station. If both match, the light projecting element 33 is turned on as a notification response to the response request signal. However, in this case, the light emitted from the light projecting element 33 does not need to include the unique identification information, and any light may be displayed as long as there is some response. The notification response method is not limited to lighting of the display element 33. Any other method (such as sound) can be adopted as long as it operates by the electromotive force generated by the information providing unit 3 and can be recognized by the sender of the response request signal.

  In any of the above embodiments, in one terminal, both the output of a signal corresponding to the control data 53 obtained at the timing of the transmission clock signal to the controlled unit 11 and the reception of the monitoring signal from the sensor unit 12 are performed. However, one terminal may perform only one of the processes. For example, two types of terminals may be used: a slave station output terminal that performs only control data output processing to the controlled unit 11 and a slave station input terminal that performs only monitoring data reception processing from the sensor unit 12.

DESCRIPTION OF SYMBOLS 1 Controlled device 2, 28, 29 Slave station 3 Information provision part 4 Master station 5 Control part 6, 68, 69 Terminal device 11 Controlled part 12 Sensor part 21, 31, 65 MCU
32 Solar cell 33 Light projecting element 34 Inductive coil 35 Rectifier circuit 51 Output unit 52 Input unit 53 Control data 54 Monitoring data 61 Light projecting unit 62 Light receiving unit 63 Input unit 64 Display unit 66 Magnetic field generating unit

Claims (4)

  An information providing unit including an electromotive force generating means, a storage means, and an arithmetic processing means that operates by the electromotive force generated by the electromotive force generating means is included, and the unique identification information of the storage means is a separate terminal device. Slave station terminal that is read / written at   The slave station terminal according to claim 1, wherein the unique identification information is delivered to the terminal device in response to a response request signal superimposed on the electromotive force generation medium.   An information adding unit including an electromotive force generation unit, a storage unit, and an arithmetic processing unit that operates by the electromotive force generated by the electromotive force generation unit is included, and a notification response to the response request signal is made. Slave station terminal. The slave station terminal according to claim 3, wherein the notification response is made to the response request signal superimposed on the electromotive force generation medium.

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