JP2011114449A - Remote wiring check system, and connection connector used in the system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a remote wiring check system capable of easily checking a wiring connection state of a slave station itself, and between the slave station and a device to be controlled without reducing an input data (monitoring data) capacity of signals that are bidirectionally and simultaneously transmitted between a master station and the slave station connected by a data signal line whose wiring is saved in a control and monitoring signal transmission system provided with a single control section and a plurality of devices to be controlled. <P>SOLUTION: In transmission of control data from a control section and of monitoring data from a sensor, a series of pulse-shaped voltage signals outputted as a control data signal are provided with a management data area including connection data showing a wiring state different from a control and monitoring data area composed of the control data and the monitoring data in accordance with the value of the control data under control of a prescribed timing signal synchronized with a clock of a prescribed frequency. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention includes a single control unit and a plurality of controlled devices, a master station is connected to the control unit and the data signal line, and a plurality of slave stations corresponding to the plurality of controlled devices correspond to the data signal line and the corresponding In a control / monitoring signal transmission system configured to be connected to a controlled device, a remote wiring check system for remotely confirming a wiring connection state of a sensor, an actuator, an indicator light, etc. of the slave station and the controlled device and the system Connection connector

  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 Reduction of wiring leads to a reduction in wiring space, a reduction in wiring man-hours, a reduction in device manufacturing time, or downsizing of equipment, thereby making it possible to improve equipment reliability and reduce costs.

  Therefore, attempts have been made to reduce the number of wires in the control system as described above. Specifically, adopt a signal transmission method in which one (1 bit) control signal or sensor signal (input signal from the controlled device) corresponding to each clock is superimposed on the clock signal line including the power supply. Thus, the wiring saving between the control unit and the controlled device is realized.

  Further, in this signal transmission method, Japanese Patent Laid-Open No. 2002-152864 discloses a technique for increasing the signal transmission speed between the control unit and the controlled device. In the control / monitor signal transmission system disclosed herein, a master station is connected to a control unit and a data signal line, and a plurality of slave stations corresponding to a plurality of controlled devices are connected to the data signal line and the corresponding controlled device. It becomes the composition connected to. Then, the latter half or the first half of each cycle of the clock is further time-divided into a control signal area and a monitor signal area, and the control signal and the monitor signal are superimposed and detected on each. Thereby, in addition to the control signal from the control unit to the controlled unit, the monitoring signal from the sensor unit to the control unit can be superimposed on the clock signal including the power supply. Therefore, bidirectional high-speed signal transmission between the control unit, the controlled unit, and the sensor unit can be realized, and the control signal and the monitoring signal can be output to a common data signal line, and both can be simultaneously transmitted. Can be transmitted in the same direction. As a result, it is not necessary to separately provide a period for transmitting the control signal or the monitoring signal in the common data signal line, and the signal transmission speed (rate) can be increased to twice the conventional speed.

JP 2002-152864 A

  However, even when the above-mentioned wiring saving is realized, the wiring between the output terminal part of the slave station and the actuator, indicator light, etc. of the controlled part, and the input terminal part and sensor part of the slave station Wirings with switches, proximity switches, etc. are individually connected with a plurality of wirings. If these wires are disconnected or short-circuited, or if a wiring abnormality such as an incorrect wiring occurs, an incorrect input signal and output signal are transmitted to the control unit, resulting in erroneous control. Therefore, when these wiring abnormalities occur, it is necessary to check the wiring of each of the slave stations far from the control unit, and much man-hours are required to find the wiring abnormal part. In addition, when an abnormality occurs in the internal wiring of multiple slave stations themselves, that is, when a malfunction occurs in the slave station, it is the same as when such a wiring malfunction occurs, and the faulty slave station is found. This requires a lot of man-hours.

  As a method to save the trouble of each wiring check of the slave station including the internal wiring of the slave station itself, an output wiring check circuit or an input wiring check circuit is added, and the detection signal data is assigned to the slave station input section, and the detection result A method of monitoring the master station side is also conceivable. However, this method has a problem that the capacity of input data (monitoring data) out of limited transmission data is consumed, and the monitoring data of the sensor unit usable in the controlled device is reduced.

  Therefore, the present invention provides a control / monitoring signal transmission system including a single control unit and a plurality of controlled devices, both between a master station and a slave station connected by a reduced data signal line. A remote wiring check system that can easily check the connection status between the slave station itself and the slave station and the controlled device without reducing the input data (monitoring data) capacity of signals transmitted simultaneously. The purpose is to provide. In addition, another object is to provide a connection connector particularly suitable for the remote wiring check system.

  A remote wiring check system according to the present invention includes a master station connected to a control unit and a common data signal line, and a plurality of slave stations connected to the common data signal line and a corresponding controlled device. The controlled device includes a controlled unit that operates in accordance with an output instruction from the control unit and / or a sensor unit that transmits input information to the control unit. The master station has timing generating means for generating a predetermined timing signal synchronized with a clock having a predetermined cycle. Further, the master station outputs a series of pulse voltage signals as control data signals to the data signal line according to the value of control data from the control unit under the control of the timing signal, and Under the control of the timing signal, the data value of the monitoring data signal superimposed on the series of pulse voltage signals is extracted for each cycle of the clock, and this is transferred to the control unit. Each of the plurality of slave stations extracts the value of each data of the control data signal for each cycle of the clock under the control of the timing signal, and sends it to the local station in the value of each data. The corresponding data is delivered to the corresponding controlled unit and / or the monitoring signal is controlled according to the value of the monitoring data of the corresponding sensor unit for each cycle of the clock signal under the control of the timing signal. A data signal is superimposed on the series of pulsed voltage signals. The series of pulse voltage signals is provided with a management data area including connection data indicating a wiring state, which is different from the control / monitor data area constituted by the control data and the monitor data.

  The connection data may identify short-circuit information, disconnection information, and normal information. Alternatively, it may indicate the state of the internal wiring of the slave station itself.

  In the management data area, identifier data of the controlled unit and the sensor unit transmitted from the slave station may be superimposed. The identifier data may be, for example, relative address data with respect to representative address data of a slave station to which a plurality of controlled units and sensor units are connected.

  In the management data area, management control data from the master station designating each of the controlled unit and the sensor unit may be superimposed. The management control data may be absolute address data of the controlled unit and the sensor unit. In this case, the controlled unit and the sensor unit are sequentially increased or decreased for each frame of a series of pulsed voltage signals. May be specified. Further, the management control data may be representative address data of the slave station to which a plurality of the controlled unit and the sensor unit to be specified are connected. In this case, the controlled unit and the sensor unit are indirectly connected. It will be specified. When the representative address data of the slave station is superimposed as management control data, when the connection data is neither the short-circuit information, the disconnection information, or the normal information is transmitted to the representative address data, the master station It may be determined that a disconnection has occurred in the connection between the slave stations.

  In addition, when a short circuit or disconnection occurs in the local station, the slave station confirms that the connection data is normal information, and then the controlled unit in which the short circuit or disconnection occurs in the management data area The identifier data of the sensor unit may be superimposed, and the normal information may be updated to the short-circuit information or the disconnection information. In this case, the identifier data transmitted from the slave station may be absolute address data indicating each of the controlled unit and the sensor unit by itself.

In the sensor unit, when the non-operating current of the sensor unit is minimal, a bleeder current is caused to flow between outputs of the sensor signal to be detected, and the total current including both the bleeder current and the operating current of the sensor unit is a first threshold value. May be determined to be a short circuit when the total current is greater than a second threshold. Further, it may be judged normal except for disconnection and short circuit. The first and second threshold values are appropriately set in consideration of the normal operation of the sensor unit. For example, the first threshold value is one fifth of the sum of the bleeder current and the normal detection current, The second threshold may be a value five times the normal detection current.
However, there is no limitation on the method for identifying short circuits and disconnections, and other methods may be adopted as appropriate.

  In the controlled part, when there is an output instruction to the controlled part, it is determined that the disconnection occurs when the output current is smaller than the first threshold, and the output current is larger than the second threshold larger than the operating current. When it is larger, the short circuit may be determined. The first and second threshold values may be set as appropriate in consideration of the normal operation of the controlled unit, as in the case of detecting the connection state of the sensor unit.

  The connection connector according to the present invention is used for the remote wiring check system, and includes a bleeder resistor interposed between the sensor unit and the slave station and connected in parallel with the detection unit of the sensor unit. When the wiring state is determined by the total current including both the bleeder current and the operating current of the sensor unit, the bleeder current can be allowed to flow in the existing sensor unit only by connecting to the existing sensor unit.

  In the remote wiring check system according to the present invention, in the transmission of control data from the control unit and monitoring data from the sensor unit, the control data from the control unit is controlled under a predetermined timing signal synchronized with a clock having a predetermined cycle. Depending on the value, a series of pulsed voltage signals as control data signals are provided with a management data area different from the control / monitor data area consisting of control data and monitor data, and this management data area is wired It is to be used for confirmation. Therefore, in the synchronous address transmission method, control data, monitoring data and management data can be transmitted simultaneously as a series of data groups (one frame transmission cycle) starting from a start signal, and the data capacity of control data and monitoring data Does not affect the transmission speed. On the other hand, since the connection data of the wiring is collected in the control unit via the master station, it is not necessary to go directly to the far site where wiring is performed. In other words, it is possible to easily check the wiring connection state between the slave station and the controlled device on the master station side without reducing the capacity of the monitoring data transmitted simultaneously between the master station and the slave station. it can.

  The connection data corresponding to the confirmation target specified by the management control data superimposed on the management data area is superimposed. Since the management control data is changed to constant or different for each frame transmission cycle, the connection data is sequentially superimposed on the constant or different data accordingly. That is, connection data is transmitted for one (predetermined number) of confirmation targets for each frame transmission cycle. There is no restriction on the order of designation of the confirmation target, but when an identifier such as an address number is assigned to each of the controlled unit and the sensor unit, the identifier of the controlled unit and the sensor unit is used as management control data for one frame. What is necessary is just to superimpose for every transmission cycle sequentially. On the other hand, when an identifier is assigned to each of the slave stations, the identifiers (representative addresses) of the slave stations may be sequentially superposed as management control data for each frame transmission cycle. In this case, in each slave station, the state of the internal wiring of the local station and the connection state of the sensor unit or the controlled unit connected to the local station are detected, and connection data is transmitted based on the detection result. When a plurality of sensor units and controlled units are connected to the slave station, the management monitoring data includes connection data and a relative target to be identified for distinguishing the plurality of sensor units and controlled units. Alternatively, an absolute address data identifier (identifier data) is included. When the master station superimposes address data of a slave station to which a plurality of controlled units and sensor units are connected as management control data, the slave station management monitoring data (connection data and identifier data) corresponding to the address data Is delayed by one frame transmission cycle.

  The connection data may simply be able to detect that a failure has occurred in the connection state, but if the content of the failure specifically identifies short-circuiting, disconnection and normality, Subsequent measures can be taken quickly and appropriately.

  Furthermore, if the connection data can identify short circuit, disconnection, and normality, the slave station that refers to the management monitoring data should determine whether or not wiring abnormality information in other stations is superimposed as management monitoring data. Can do. Therefore, it is possible to superimpose short-circuit information and disconnection information by the determination of the slave station without designating the confirmation target by the management control data. That is, when a short circuit or disconnection occurs in the local station, the slave station confirms that the transmitted connection data is normal information, updates the normal information to short circuit information or disconnection information, and By updating the data corresponding to the controlled unit or sensor unit in which the disconnection occurs, the master station side can easily check the wiring connection state between the slave station and the controlled device.

It is a schematic diagram of the transmission system between the master station and the slave station in the embodiment of the remote wiring check system according to the present invention. It is a system block diagram which shows schematic structure of the same remote wiring check system. It is a system configuration | structure figure of a master station. It is a schematic diagram of an address table stored in the master station. It is a time chart figure of the signal transmitted / received between a master station and a slave station. It is a block diagram of a slave station output unit. It is a block diagram which shows the connection state of an output data part and an actuator. It is a block diagram of a slave station input part. It is a block diagram which shows the connection state of an input data part and a two-wire type sensor. It is a block diagram which shows the connection state of an input data part and a contact sensor.

An embodiment of a remote wiring check system according to the present invention will be described with reference to FIGS.
As shown in FIG. 2, the remote wiring check system includes a master station 6 connected to a control unit 1 and common data signal lines DP and DN (hereinafter referred to as data signal lines DP and DN), and the data signal. A plurality of slave stations 2 connected to the lines DP and DN and the corresponding controlled devices 5 are provided. The controlled device 5 includes a controlled unit 51 that operates according to an output instruction from the control unit 1 and a sensor unit 52 that transmits input information to the control unit 1. The controlled unit 51 includes various components constituting the controlled device 4, such as an actuator, a (stepping) motor, a solenoid, a solenoid valve, a relay, a thyristor, and a lamp. On the other hand, the sensor unit 52 is selected according to the corresponding controlled unit 51, and includes, for example, a reed switch, a micro switch, a push button switch, an optical sensor, and the like, and outputs an on / off state (binary signal). In this embodiment, an actuator is used as the controlled unit 51, and a two-wire sensor and a reed switch (hereinafter referred to as a contact sensor) are used as the sensor unit 52. The sensor 52a and the contact sensor 52b are used.

  The control unit 1 is, for example, a programmable controller, a computer, and the like. The control unit 13 outputs the control data 13 and the initial setting (initialization) signal data 14, and the sensor data (monitoring data signal data) from the controlled device 4 side. ) 15 and an input unit 12 for receiving connection data 16. These output unit 11 and input unit 12 are connected to the master station 6.

  As shown in FIG. 3, the master station 6 includes an output data section 61, an IDX address data section 62, a timing generation section 63, a master station output section 64, a master station input section 65, an input data section 66, management monitoring data extraction means. 78 and connection data detection means 79 are provided.

  The output data unit 61 passes the parallel data received as the control data 13 from the output unit 11 of the control unit 1 to the master station output unit 64. This control data 13 is used to instruct the operation of the actuator 51.

  The IDX address data unit 62 stores IDX address data in an IDX address table 68 provided therein. The IDX address data is data for specifying the slave station 2 to which the actuator 51, the two-wire sensor 52a, or the contact sensor 52b, whose wiring state is to be confirmed, is connected. Used. In this embodiment, since two actuators 51 or two-wire sensor 52a and contact sensor 52b are connected to one slave station 2, the head address is # ad0, as shown in FIG. It becomes every other address such as # ad2. These IDX address data are delivered to the control data generating means 73 and the connection data detecting means 79. The table shown in FIG. 4A is generated in response to the initial setting signal data 14, and the generation procedure will be described later. Note that addresses # ad0, # ad2, and the like shown in FIG. 4 are addresses assigned for each cycle of a transmission clock signal to be described later.

  The timing generation unit 63 includes an oscillation circuit (OSC) 71 and a timing generation unit 72. Based on the OSC 71, the timing generation unit 72 generates a timing clock of the transmission system and passes it to the master station output unit 64. The master station output unit 64 includes a control data generation unit 73 and a line driver 74. The control data generation unit 73 receives data from the output data unit 61 and the IDX address detection unit 62 and the timing received from the timing generation unit 63. A control data signal is generated based on the clock and sent to the data signal lines DP and DN via the line driver 74. The line driver 74 also receives power supply from the DC power supply 75 and supplies circuit power for the slave station 2 via the common data signal lines DP and DN together with the control data signal.

  A control data signal sent to the data signal lines DP and DN from the master station output unit 64 (corresponding to a series of pulse voltage signals in the present invention, hereinafter, a control data signal flowing through the data signal lines DP and DN is transmitted as a transmission clock) A data value (referred to as a signal) is represented by a pulse width during a period of high voltage level in one cycle of the timing clock. As shown in FIG. 5, the transmission clock signal has a high potential level (+ 24V in this embodiment) in the second half of one cycle and a low potential level (+ 19V in this embodiment) in the first half. The width of the high potential level is expanded according to the value of each data of the control data 13 input from the control unit 1. In this embodiment, when one period of the transmission clock signal is t0, the period is extended to (3/4) t0. However, the width is not limited and may be adjusted as appropriate according to transmission conditions and the like. There are no restrictions on the representation format of the data value, and other representation formats such as high and low voltage levels and the presence / absence of current may be employed as appropriate. An address is assigned for each cycle of the transmission clock signal. In this embodiment, address 0 (# ad0), address (# ad1), address 2 (# ad2), and address 3 (# The value (output data) of the control data in each of ad3) represents “0”, “0”, “1”, “0”, respectively.

  FIG. 1 schematically shows this transmission procedure. In this transmission procedure, a control / monitoring data area composed of control data out0-outn and monitoring data in0-inn follows the start signal ST, and then management data on which the connection data CDT is superimposed. The area has continued. The slave station 2 takes in control data to be received by the slave station 2 by counting addresses assigned for each cycle of the transmission clock signal. The address count is started from the end of the first start signal ST of the transmission clock signal. The start signal ST is a signal having the same potential level as the high potential level of the transmission clock signal and longer than one cycle of the transmission clock signal.

  The master station input unit 65 includes a monitoring signal detection unit 76 and a monitoring data extraction unit 77, and sends input data to the input data unit 66. The monitoring signal detection means 76 detects the monitoring data signal and the connection data signal transmitted from the slave station 2 via the common data signal lines DP and DN. The monitoring data signal sent from the slave station 2 is a signal indicating whether the detection target of the two-wire sensor 52a or the contact sensor 52b is detected as a current level, and after each start signal ST is sent, It is received sequentially from the slave station 2. The connection data signal is a response value of the slave station 2 (initial confirmation signal) with respect to the initial confirmation described later, or binary connection data indicating the wiring state of the actuator 51, the two-wire sensor 52a, and the contact sensor 52b. It has been represented. The monitoring data of the monitoring data signal and the connection data of the connection data signal are extracted by the monitoring data extracting means 77 in synchronization with the signal of the timing generating means 72, and the input data section 66 and management monitoring data are extracted as serial input data. It is sent to the means 78.

  The input data unit 66 that has received the serial input data from the master station input unit 65 converts the serial input data into parallel data, and delivers it as sensor data 15 to the input unit 12 of the control unit 1. On the other hand, the management monitoring data extraction unit 78 extracts connection data from the input data, and delivers the connection data to the connection data detection unit 79. When the IDX address table 68 is generated, the connection data detection means 79 passes the information from which the initial confirmation signal is extracted to the IDX address data unit 62, and when the connection state is being confirmed. The connection data is transferred to the input data unit 66. The input data unit 66 that has received the connection data passes it to the input unit 12 of the control unit 1 as connection data 16 indicating normality, disconnection, or short circuit.

  The master station 6 also has a transmission bleeder current circuit 67 as a transmission interface circuit. The transmission bleeder current circuit 67 is connected to the line driver 74 in the master station output unit 64 and stabilizes the transmission path between the data signal lines DP and DN.

  The slave station 2 includes a slave station output unit 30 and a slave station input unit 40, each of which is connected to the data signal lines DP and DN, and receives a signal received from the two-wire sensor 52a or the contact sensor 52b as a monitoring data signal. And the necessary information is extracted from the transmission clock signal transmitted on the data signal lines DP and DN, and the actuator 51 is operated.

  As shown in FIG. 6, the slave station output unit 30 includes an address setting unit 31, an address extraction unit 32, a slave station data output unit 33, an output data unit 34, an actuator connection detection unit 35, and a control data signal extraction unit 36. I have. Also, two connection terminals outN and outN + 1 are provided, and an actuator 51 is connected to each of them.

  The slave station output unit 30 is equipped with a microcomputer control unit (MCU) 39, and includes an address setting unit 31, an address extraction unit 32, a slave station data output unit 33, and an output data unit 34. Each processing is performed by the MCU 39. Calculations and storages required for each process are executed using the CPU, RAM, and ROM provided in the MCU 39. However, in FIG. 6, the relationship between the CPU, RAM, and ROM in each process is omitted for convenience of explanation.

  The address setting means 31 recognizes an address value set by an address setting switch (not shown) and delivers it to the address extraction means 32. The address setting is not limited to a mechanical method using a switch or the like. For example, a preset value may be transmitted from the master station 6 and stored.

  The address extracting means 32 is handed over the local station address recognized by the address setting means 31 and is transmitted with a transmission clock signal from the data signal lines DP and DN via the control data signal extracting means 36. The address extraction unit 32 obtains data of its own station address based on these pieces of information, and delivers the data to the slave station data output unit 33. The data delivered to the slave station data output means 33 is further delivered to the output data unit 34, and the actuator 51 operates based on these data. The series of processing is performed in synchronization with the clock of the transmission clock signal transmitted to the data signal lines DP and DN, that is, under the control of the timing signal.

  The actuator connection detection unit 35 includes an A / D converter. The A / D converter detects a normal state, a short circuit, or a disconnection state (connection state) based on a voltage value due to a change in current flowing between the output data unit 34 and the wiring of the actuator 51. The actuator connection detection unit 35 sends the detected connection state as normal information, short circuit information, or disconnection information to the data signal lines DP and DN through the output Iout1. Specifically, the normal information is transmitted as binary data “11”, the short-circuit information “10”, and the disconnection information “01”. However, there is no limitation on the data expression format, and an expression format corresponding to the usage situation can be selected as appropriate.

  The detection principle of the current change is shown in FIG. As shown in FIG. 7, when the actuator 51 operates normally, an operating current iw flows through the electromagnetic valve 53 of the actuator 51, but when a short circuit occurs in the wiring between the output data unit 34 and the actuator 51, The short circuit current is flows without passing through the valve 53. Since the short-circuit current is is larger than the operating current iw, the voltage drop v at the detection resistor Rd provided in the output data section 34 is increased. When the wiring between the output data unit 34 and the actuator 51 is disconnected, no current flows through the detection resistor Rd, and the voltage drop v is zero. Therefore, the information on the connection state can be obtained by detecting the voltage drop v of normal, short circuit, and disconnection by the A / D converter. Note that a transistor Trd is connected in series to the detection resistor Rd, and the base onN of the transistor Trd is “on” only when an output instruction is given to the actuator 51. Therefore, the detection only needs to be valid when the base onN is “on”. In this embodiment, when the current calculated from the voltage drop v is smaller than the first threshold (for example, one fifth of the operating current iw), the disconnection and the second threshold (greater than the operating current iw) ( For example, if it is larger than the value (5 times the operating current iw), it is judged as a short circuit. FIG. 7 relates to the connection terminal outN, but the operation is the same for the connection terminal outN + 1, and thus the description thereof is omitted.

  Although the slave station output unit 30 does not have a dedicated power supply, it is used inside the slave station output unit 30 from a transmission clock signal on which power is superimposed supplied from the common data signal lines DP and DN. The power supply voltage is generated by a diode, a capacitor, and a three-terminal power supply element.

  As shown in FIG. 8, the slave station input unit 40 includes an address setting unit 41, an address extraction unit 42, a slave station data input unit 43, an input data unit 44, a sensor connection detection unit 45, and a control data signal extraction unit 46. I have. In addition, two connection terminals inN and inN + 1 are provided, a contact sensor 52b is connected to the connection terminal inN, and a two-wire sensor 52a is connected to the connection terminal inN + 1. Further, the slave station input unit 40 is also equipped with a microcomputer control unit (MCU) 49 as in the slave station output unit 30, and includes an address setting means 41, an address extraction means 42, and a slave station data input means 43. The processing in each of the input data unit 44 is performed by the MCU 49. The address setting means 41, the address extraction means 42, and the control data signal extraction 46 have substantially the same configuration as the address setting means 31, the address extraction means 32, and the control data signal extraction means 36 of the slave station output unit 30. Since the operation is substantially the same, the description thereof is omitted. Also, in FIG. 8, as in FIG. 6, the relationship between the CPU, RAM, and ROM in each processing is omitted for convenience of explanation.

  The input data section 44 delivers one or a plurality of (bit) data signals input from the corresponding two-wire sensor 52 a and the contact sensor 52 b to the slave station data input means 43. The data delivered here is held in the slave station data input means 43. In the slave station data input means 43, when an address is input from the address extraction means 42, the output of the Iout0 signal is set to “on” or “off” according to the held data or data. When the Iout0 signal is “on”, the transistor 47 is “on”, and the monitoring data signal is output to the data signal lines DP and DN. The monitoring data signal output here is output in a predetermined order for each of the two-wire sensor 52a and the contact sensor 52b, and is a serial signal. That is, the slave station data input means 43 performs parallel / serial conversion on the monitoring data signal.

  At this time, the data value of the monitoring data signal is expressed as a current level in the first half (period of low potential level) of one cycle of the transmission clock signal, as described above. In this embodiment, as shown in FIG. 5, when the data value of the monitoring data signal is “1”, a current (for example, 30 mA) of a predetermined value Ith or more is passed, and when it is “0”, the bleeder current ( For example, it is expressed only as 10 mA). Therefore, for example, the monitoring data at addresses 0 (# ad0), 1 (# ad1), 2 (# ad2), and 3 (# ad3) of the signal shown in FIG. 0 "," 1 ", and" 0 "are represented.

  Similar to the actuator connection detection unit 35, the sensor connection detection unit 45 includes an A / D converter. This A / D converter detects a normal, short-circuited, or disconnected state (connected state) based on a voltage value caused by a change in current flowing between the input data unit 44 and the two-wire sensor 52a or the contact sensor 52b. To do. The sensor connection detection unit 45 sends the detected connection state to the data signal lines DP and DN through the output Iout1 as normal information, short circuit information, or disconnection information. Specifically, the normal information is transmitted as binary data “11”, the short-circuit information “10”, and the disconnection information “01”. However, there is no limitation on the data expression format, and an expression format corresponding to the usage situation can be selected as appropriate.

  The detection principle of the current change is shown in FIGS. First, in the case of the two-wire sensor 52a, as shown in FIG. 9, when the magnetic body 54 attached to the detection target approaches, the detection current ic flows, and the circuit current ia in the sensor is constantly flowing. The total value ib + ic of the standby current ib and the detected current ic is obtained. When a short circuit occurs in the wiring between the input data unit 44 and the two-wire sensor 52a, a short circuit current is larger than the total value ib + ic flows. Therefore, the voltage drop v at the detection resistor Rd provided inside the input data unit 44 is increased. When the wiring between the input data unit 44 and the two-wire sensor 52a is disconnected, no current flows through the detection resistor Rd, and the voltage drop v is zero. Therefore, the information on the connection state can be obtained by detecting the voltage drop v of normal, short circuit, and disconnection by the A / D converter. In this embodiment, if the calculated current value is smaller than the first threshold value (for example, one fifth of the sum of the standby current ib and the normal detection current ic) via the A / D converter, the circuit breaks. If it is larger than the second threshold (for example, a value that is five times the normal detection current ic), it is determined that a short circuit has occurred.

  Since a change in current between the wirings of the input data unit 44 and the contact sensor 52b is detected in the same manner, the connection state between the input data unit 44 and the contact sensor 52b shown in FIG. The same parts are denoted by the same reference numerals, and the description thereof is omitted. The connection state shown in FIG. 10 is different from that shown in FIG. 9 in that a bleeder resistance Rb is provided. In the contact sensor 52b, when the magnet 55 approaches (or may be separated), the contact is closed and the detection current ic flows, so that no current flows when the contact is open. Therefore, the bleeder resistor Rb is connected in parallel with the contact so that the bleeder current ib can flow even when the contact is open. The bleeder resistance Rb is included in the connection connector 56, and flows a bleeder current ib corresponding to the standby current ib of the main body of the contact sensor 52b in FIG.

  Similarly to the slave station output unit 30, the slave station input unit 40 also uses a diode, a capacitor, and a three-terminal power element to convert the power supply voltage used in the slave station input unit 40 from the transmission clock signal superimposed with the power supply. Producing.

  In the above configuration, as shown in FIG. 1, the master station 6 sends the start signal ST and the control data out0 and out1 of the first (# ad0 and # ad1) slave station 2, followed by 2 The control data out2 and out3 of the second (# ad2 and # ad3) slave station 2, and the control data of the last slave station 2 are transmitted in the same manner, and thereafter the index address data IDX is transmitted. On the other hand, the monitoring data in0 to inn are sent from the slave station 2 within the same clock cycle period as the control data, and thereafter, an identifier for specifying the actuator 51, the two-wire sensor 52a, and the contact sensor 52b. Data ADS and connection data CDT are transmitted. In this transmission procedure, # ad0 to #adn are control / monitor data areas, and an area including index address data IDX, identifier data ADS, and connection data CDT is a management data area. The index address data IDX corresponds to management control data, and the identifier data ADS and connection data CDT correspond to management monitoring data. The signal transmission between the master station 6 and each slave station 2 is repeated during the operation of the system.

  The control data out0-outn are output instruction data for the actuator 51. The slave station output unit 30 passes the control data signal extraction unit 36 and the slave station data output unit 33 to the output data unit 34, and based on this data. Thus, the actuator 51 operates. For example, if the actuator 51 operates when the control data is “1”, the actuator 51 corresponding to # ad2 operates in the case shown in FIG.

  On the other hand, the monitoring data in0 to inn is information from the two-wire sensor 52a and the contact sensor 52b, and as described above, the child that has received one or more (bit) data input from these sensors. The data is sent from the station data input means 43. For example, if the monitoring data is set to “1” when the object is detected by the sensor, the sensor corresponding to # ad2 has detected the object in the case shown in FIG.

  The index address data IDX is data for designating the actuator 51, the two-wire sensor 52a, or the contact sensor 52b whose wiring state is to be confirmed. In this embodiment, the slave station 2 to which they are connected. The head address of the slave station 2 is used as data for designating. The master station 6 first selects index address data (# ad0) of table number 0 from the index address data group stored in the IDX address table 68, and transmits this. Subsequently, index address data corresponding to each table number is sequentially transmitted every frame transmission cycle. In each slave station 2, when the address assigned to the local station matches the data value of the index address data IDX, the actuator 51, the two-wire sensor 52a, or the contact sensor 52b connected to the local station is disconnected or short-circuited. Are generated, identifier data ADS (relative address with respect to the head address of the slave station 2 such as the actuator 51) for identifying them and connection data CDT are transmitted. At this time, the transmitted connection data CDT is “01” if it is disconnected, and “10” if it is short-circuited. If the connection state is normal, “11” is transmitted as the connection data CDT without transmitting the identifier data ADS. If a disconnection occurs in the connection between the master station 6 and the slave station 2, no data is transmitted from the slave station 2, so the connection data CDT is “00”. That is, when the connection data CDT does not transmit any of the short circuit information “10”, the disconnection information “01”, or the normal information “11” with respect to the address (representative address data) assigned to the slave station 2, the master station 6 Therefore, it can be determined that a disconnection has occurred in the connection between the slave station 2 and the slave station 2.

  When both of the two actuators 51 connected to the slave station 2 or both of the two-wire sensor 52a and the contact sensor 52b are disconnected or short-circuited, the slave station 2 has a predetermined order. First, one of the connection data CDT is transmitted. Then, when the connection data CDT indicates normality, that is, when it becomes “11”, the other connection data CDT is transmitted.

  The IDX address table 68 is created by an initial setting command from the control unit 1. Receiving the initial setting signal 14 indicating the initial setting command, the master station 6 increments the index address data IDX of the management data area in the transmission clock signal by one until reaching the maximum address value every frame transmission cycle. . Each slave station 2 returns a response of “11” as connection data CDT when the address (head address) assigned to the local station matches the data value of the index address data IDX. If the connection data CDT is “11”, it is extracted by the connection data detection means 79 of the master station 6, and its head address is index address data in the internal memory provided in the index address detection unit 62. As stored.

  In this embodiment, the head address of the slave station 2 is stored in the IDX address table 68. This is the address assigned to each of the plurality of actuators 51, the two-wire sensor 52a, and the contact sensor 52b. (Hereinafter referred to as all addresses). In this case, as shown in FIG. 4B, the IDX address table 68 stores all the addresses assigned for each cycle of the transmission clock signal. When the head address of the slave station 2 is used for the index address data IDX, the number of cycles required to specify all addresses is smaller than when all addresses are used. Therefore, there is an advantage that the time required for connection confirmation is shortened. On the other hand, when all addresses are used for the index address data IDX, it can be implemented by a simple process of adding one by one until the maximum address value is reached for each frame transmission cycle. There is an advantage that 68 can be omitted.

  In this embodiment, the index address data IDX is used as the data for designating the actuator 51, the two-wire sensor 52a, or the contact sensor 52b whose wiring state is to be confirmed. The slave station 2 that has confirmed the disconnection or short circuit may send information by itself without specifying the confirmation target. In this case, the index address data IDX in the management data area shown in FIG. 1 is blank, and the slave station 2 in which a short circuit or disconnection has occurred in the local station confirms that the connection data CDT is normal information “11”, The data CDT is updated to the short circuit information “10” or the disconnection information “01”, and the identifier data ADS is updated to the absolute address of the actuator 51, the two-wire sensor 52a, or the contact sensor 52b in which the short circuit or the disconnection occurs. .

  Further, in this embodiment, the connection state between the slave station 2 and the actuator 51, the two-wire sensor 52a, or the contact sensor 52b is displayed as the connection data CDT. It is good also as what displays the state of this, ie, the malfunction of each slave station 2. FIG. In that case, if each slave station 2 is provided with a known check circuit for confirming the internal wiring of its own station, and if the check result is transmitted to the master station 6 as connection data CDT, a problem occurs. It is possible to easily check the existing slave station 2 on the master station 6 side.

DESCRIPTION OF SYMBOLS 1 Control part 2 Slave station 5 Controlled apparatus 6 Master station 11 Output unit 12 Input unit 13 Control data 14 Initial setting signal data 15 Sensor data 16 Connection data 30 Slave station output part 31 Address setting means 32 Address extraction means 33 Slave station data Output means 34 Output data section 35 Actuator connection detection section 36 Control data signal extraction means 37, 47 Transistors 39, 49 MCU
40 Slave station input unit 41 Address setting unit 42 Address extraction unit 43 Slave station data input unit 44 Input data unit 45 Actuator connection detection unit 46 Control data signal extraction unit 51 Controlled unit (actuator)
52 Sensor unit 52a Two-wire sensor 52b Contact sensor 52b
53 Solenoid valve 54 Magnetic body 55 Magnet 55
56 connector 61 output data section 62 ID address detection section 63 timing generation section 64 master station output section 65 master station input section 66 input data section 67 transmission bleeder current circuit 68 ID address table 71 transmitter 72 timing generation means 73 control data generation Means 74 Line driver 75 DC power supply 76 Monitoring signal detection means 77 Monitoring data extraction means 78 Management monitoring data extraction means 79 Connection data detection means

Claims (9)

A master station connected to the control unit and a common data signal line, and a plurality of slave stations connected to the common data signal line and the corresponding controlled device;
The controlled device includes a controlled unit that operates according to an output instruction of the control unit and / or a sensor unit that transmits input information to the control unit,
The master station has timing generation means for generating a predetermined timing signal synchronized with a clock of a predetermined cycle, and under the control of the timing signal, according to the value of control data from the control unit, A series of pulsed voltage signals are output to the data signal line as control data signals, and a monitoring data signal is superimposed on the series of pulsed voltage signals for each cycle of the clock under the control of the timing signal. Data value is extracted and passed to the control unit,
Each of the plurality of slave stations extracts the value of each data of the control data signal for each cycle of the clock under the control of the timing signal, and sends it to the local station in the value of each data. The corresponding data is delivered to the corresponding controlled unit and / or the monitoring signal is controlled according to the value of the monitoring data of the corresponding sensor unit for each cycle of the clock signal under the control of the timing signal. In a control / monitor signal transmission system that superimposes a data signal on the series of pulsed voltage signals,
Remote wiring characterized in that a management data area including connection data indicating a wiring state is provided in the series of pulse voltage signals, which is different from a control / monitor data area composed of the control data and the monitoring data. Check system.   The remote wiring check system according to claim 1, wherein short-circuit information, disconnection information, and normal information are identified in the connection data.   The remote wiring check system according to claim 1 or 2, wherein identifier data of the controlled unit and the sensor unit transmitted from the slave station is superimposed on the management data area.   The remote wiring check system according to claim 1 or 2, wherein management control data from the master station designating each of the controlled unit and the sensor unit is superimposed on the management data area.   As the management control data, representative address data of the slave station to which a plurality of specified controlled parts and sensor parts are connected is superimposed, and the connection data is the short-circuit information and disconnection information with respect to the representative address data. 5. The remote wiring check system according to claim 4, wherein when neither normal information nor normal information is transmitted, it is determined that a disconnection has occurred in the connection between the master station and the slave station.   The slave station, when a short circuit or disconnection occurs in its own station, after confirming that the connection data is normal information, the controlled unit and the sensor unit in which a short circuit or disconnection occurs in the management data area The remote wiring check system according to claim 2, wherein the identifier data is superimposed and the normal information is updated to the short-circuit information or the disconnection information.   In the sensor unit, when the non-operating current of the sensor unit is minimal, a bleeder current is caused to flow between outputs of the sensor signal to be detected, and the total current including both the bleeder current and the operating current of the sensor unit is a first threshold value. 7. The remote wiring check system according to claim 2, wherein the disconnection is determined when the current is smaller than the second threshold, and the short circuit is determined when the total current is larger than a second threshold.   In the controlled part, when there is an output instruction to the controlled part, it is determined that the disconnection occurs when the output current is smaller than the first threshold, and the output current is larger than the second threshold larger than the operating current. The remote wiring check system according to any one of claims 2 to 6, wherein the short circuit is determined to be a short circuit when it is large. A master station connected to the control unit and a common data signal line, and a plurality of slave stations connected to the common data signal line and the corresponding controlled device;
The controlled device includes a controlled unit that operates according to an output instruction of the control unit and / or a sensor unit that transmits input information to the control unit,
The master station has timing generation means for generating a predetermined timing signal synchronized with a clock of a predetermined cycle, and under the control of the timing signal, according to the value of control data from the control unit, A series of pulsed voltage signals are output to the data signal line as control data signals, and a monitoring data signal is superimposed on the series of pulsed voltage signals for each cycle of the clock under the control of the timing signal. Data value is extracted and passed to the previous control unit,
Each of the plurality of slave stations extracts the value of each data of the control data signal for each cycle of the clock under the control of the timing signal, and sends it to the local station in the value of each data. The corresponding data is delivered to the corresponding controlled unit and / or the monitoring signal is controlled according to the value of the monitoring data of the corresponding sensor unit for each cycle of the clock signal under the control of the timing signal. Superimposing a data signal on the series of pulsed voltage signals;
In the remote wiring check system provided with a management data area including connection data indicating a wiring state, which is different from the control / monitor data area configured by the control data and the monitor data, in the series of pulse voltage signals.
A connection connector comprising a bleeder resistor interposed between the sensor unit and the slave station and connected in parallel with the detection unit of the sensor unit.

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