KR20110058663A - Remote wiring check system and access connector using the same - Google Patents

Abstract

PURPOSE: A remote wiring check system and an access connector using the same are provided to easily check the wiring state between a child station and a controlled device. CONSTITUTION: A mother station(6) is connected to a data signal line of a controller(1). A plurality of child stations(2) are connected to the controlled device(5) coping with the data signal line. The controlled device comprises the controlled part and a sensor unit. The controlled part is operated by the output command of the controller. The sensor unit transfers the input information to the controller.

Description

Remote wiring check system and access connector using the same

The present invention includes a single control unit and a plurality of controlled devices, the mother station is connected to the control unit and the data signal line, and the plurality of child stations corresponding to the plurality of controlled devices are connected to the data signal line and the control unit. In a control / monitoring signal transmission system having a configuration connected to a corresponding controlled device, a remote wiring check system for remotely checking the wiring connection status of sensors, actuators, indicators, and the like of the child station and the controlled device, and the system It relates to a connection connector used for.

In a control system having a single control unit and a plurality of controlled devices (comprising a controlled unit that operates in response to an instruction of the control unit and a sensor unit that transmits information to the control unit), the number of wirings can be reduced by reducing the wiring space, This leads to a reduction in the number of wiring steps, a reduction in the period of device fabrication, or the miniaturization of equipment, thereby improving the reliability of the equipment and reducing the cost.

Attempts have been made to reduce the number of wirings in such control systems. Specifically, by adopting 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 line of a clock signal including a power supply, Simplification of the wiring between the control unit and the controlled device is realized.

In this signal transmission method, a method for increasing the signal transmission speed between the control unit and the controlled device is disclosed in Japanese Patent Laid-Open No. 2002-152864. The control and monitoring signal transmission system disclosed herein has a configuration in which a mother station is connected to a control unit and a data signal line, and a plurality of child stations corresponding to the plurality of controlled devices are connected to a data signal line and a corresponding controlled device. Then, the second half or the first half of each clock cycle is further time-divided into a control signal region and a monitoring signal region, and the control signal and the monitoring signal are superimposed on each of them and detected. Thereby, in addition to the control signal from a control part to a controlled part, the monitoring signal from a sensor part to a control part can also be superimposed on the clock signal containing a power supply. Therefore, bi-directional high-speed signal transmission between the control unit, the controlled unit, and the sensor unit can be realized, and the control signal and the supervisory signal can be output to the common data signal line, and they can be simultaneously transmitted in both directions. As a result, it is not necessary to provide a period for transmitting the control signal or the supervisory signal on the common data signal line, and the speed (rate) of signal transmission can be increased to twice as high as the conventional one.

[Patent Document 1] Japanese Unexamined Patent Publication No. 2002-152864

By the way, even when the above wiring simplification is realized, the wiring of the output terminal unit of the child station and the actuator of the control unit, the indicator lamp, and the like, and the wiring of the switch, proximity switch, etc. of the input terminal unit of the child station, the sensor unit, etc. It is connected by the wiring of. If a wiring break, short circuit, or miswiring occurs in such a wiring, an incorrect input signal and an output signal are transmitted to the control unit, and incorrect control is generated. . For this reason, when such wiring abnormality arises, it is necessary to wire-check each wiring of the child station far from a control part, and many processes were required for the discovery of the wiring abnormal place. In addition, when an abnormality occurs in the internal wiring of the plurality of child stations themselves, that is, when a problem occurs in the child station, a lot of steps are required to find the child station in which the problem occurs in the same way as when such wiring abnormalities occur. .

As a method of omitting the procedure of checking each wiring of the child station including the internal wiring of the child station itself, an output wiring check circuit or an input wiring check circuit is added, and the detection signal data is assigned to the child station input unit to detect the result. You can also think about how to monitor the situation in your home country. However, with this method, there is a problem that the capacity of the input data (monitoring data) is eroded among the limited transmission data, thereby reducing the monitoring data available in the sensor unit of the controlled device.

The present invention is a control and monitoring signal transmission system having a single control unit and a plurality of controlled devices, wherein input data of a signal simultaneously transmitted in two directions simultaneously between a mother station and a child station connected by a simplified data signal line for wiring ( Monitoring data) It is an object of the present invention to provide a remote wiring check system that can easily check the wiring connection state between the child station itself or the child station and the controlled device without reducing the capacity. In addition, another object of the present invention is to provide a connection connector particularly suitable for the remote wiring check system.

The remote wiring check system according to the present invention includes a control station and a mother station connected to a common data signal line, and a plurality of child stations connected to the common data signal line and a corresponding controlled device. The controlled device has a controlled unit that operates in response to an output instruction of the controller and / or a sensor unit that transmits input information to the controller. The mother station has a timing generating means for generating a predetermined timing signal synchronized with a clock of a predetermined period. Further, the mother station outputs a series of pulsed voltage signals as the control data signal to the data signal line in response to the value of the 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 supervisory data signal superimposed on the series of pulsed voltage signals is extracted every one period and transmitted to the controller. Each of the plurality of child stations extracts a value of each data of the control data signal every one period of the clock under the control of the timing signal and corresponds to a locality among the values of the respective data. Transmits data to the corresponding control unit and / or transmits the monitoring data signal to the series of pulsed voltage signals in response to the value of the monitoring data corresponding to the sensor unit every one period of the clock signal under the control of the timing signal. Nested in In the series of pulsed voltage signals, a management data area including connection data indicating a wiring state different from a control / monitoring data area composed of the control data and the monitoring data is provided.

The connection data may be short circuit information, disconnection information and normal information. Alternatively, the internal wiring state of the child station itself may be shown.

In the management data area, identifier data of the control unit and the sensor unit transmitted from the child station may overlap. The identifier data may be, for example, relative address data to representative address data of a child station to which a plurality of controlled units or sensor units are connected.

In the management data area, management control data from the mother station for designating each of the control unit and the sensor unit may be superimposed. The management control data may be absolute address data of the control unit and the sensor unit, and in this case, the control unit and the sensor unit may be designated by sequentially increasing and decreasing each frame of a series of pulsed voltage signals. The management control data may be representative address data of the child station to which a plurality of the specified control unit and the sensor unit are connected. In this case, the control unit and the sensor unit are indirectly designated. When the representative address data of the child station is superimposed as management control data, when the connection data is not transmitted to any of the short-circuit information, disconnection information, or normal information with respect to the representative address data, the mother station and the child station It may be judged that the disconnection has occurred in the connection between them.

Further, when the child station checks that the connection data is normal information when a short circuit or disconnection occurs in its own station, the child station overlaps the identifier data of the control unit and the sensor unit in which the short circuit or disconnection occurs in the management data area, The normal information may be updated with the short circuit information or the disconnection information. In this case, the identifier data transmitted from the child station may be absolute address data indicating each of the control unit and the sensor unit alone.

In the sensor section, when the non-operating current of the sensor section is extremely small, a breather current flows between the outputs of the sensor signals to be detected, and all currents including both the breather current and the operating current of the sensor section have a first threshold value. When it is small compared with the above, it may be determined that the disconnection is made, and when the current is larger than the second threshold, the short circuit may be determined. Moreover, you may judge normal except for a disconnection and a short circuit. The first and second thresholds are appropriately set in consideration of the normal operation of the sensor unit. For example, the first threshold is one fifth of the sum of the breather current and the normal detection current, and the second The threshold may be five times the normal detection current.

However, there is no restriction on the method of identifying a short circuit and a disconnection, and other methods may be appropriately employed.

In the controlled part, when there is an output instruction to the controlled part, it is determined as the disconnection when the output current is smaller than the first threshold value, and the output current is larger than the second threshold value larger than the operating current. When large, you may judge with the said short circuit. The first and second thresholds may be appropriately set in consideration of the normal operation of the controlled unit, similarly to the case of detecting the connection state of the sensor unit.

The connecting connector according to the present invention is used for the remote wiring check system, and includes a breather resistor interposed between the sensor unit and the child station and connected in parallel with the detection unit of the sensor unit. In the case where the wiring state is determined by all currents including both the breather current and the operating current of the sensor unit, it is possible to flow the breather current through the already provided sensor unit by simply connecting to the already provided 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, in response to the value of the control data from the control unit under control of a predetermined timing signal synchronized with a clock of a predetermined period. A management data area different from the control / monitoring data area constituted from the control data and the monitoring data is provided in a series of pulse-type voltage signals as the control data signal, and the management data area is used for confirming the wiring connection state. For this reason, in the synchronous address transmission method, control data, monitoring data and management data can be simultaneously transferred as a series of data groups (one frame transfer cycle) starting from the start signal, and the data capacity and transmission of the control data and monitoring data can be simultaneously transmitted. It has no effect on speed. On the other hand, since the connection data of the wiring is concentrated in the control unit via the mother station, it is not necessary to go to the distant site where the wiring is directly checked. That is, the state of the wiring connection between the child station and the controlled device can be easily confirmed at the mother station without reducing the capacity of the monitoring data simultaneously transmitted in both directions between the mother station and the child station.

The connection data overlap with the confirmation object specified by the management control data superimposed on the management data area. Since the management control data is changed to a constant or different every one frame transmission cycle, the connection data also overlaps with a constant or different in sequence. In other words, the connection data is transmitted to one (constant) confirmation object every one frame transmission cycle. There is no restriction on the designation order 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 identifiers of the controlled unit and the sensor unit are sequentially superimposed for each frame transmission cycle as management control data. good. On the other hand, when identifiers are assigned to each of the child stations, the identifiers (representative addresses) of the child stations may be sequentially superimposed for each frame transmission cycle as management control data. In this case, in each child station, the internal wiring state of the local station and the connection state of the sensor unit or the controlled unit connected to the local station are detected, and the connection data is sent out based on the detection result. When a plurality of sensor units or controlled units are connected to the child station, the management monitoring data includes the connection data and a relative or absolute address data identifier (identifier data) to be identified to distinguish the plurality of sensor units and the controlled unit. Included. When the mother station overlaps the address data of the child station to which the plurality of controlled units or sensor units are connected as the management control data, the management monitoring data (connection data and identifier data) of the child station corresponding to the address data is one frame transfer cycle. It is late.

The connection data may merely be capable of detecting that a problem has occurred in the connection state, but if the contents of the problem are specifically identified as short circuit, disconnection, and normality, subsequent measures can be promptly and appropriately performed.

If the connection data can identify short circuits, disconnections and normals, the child station referred to the management monitoring data can determine whether information on wiring errors in other stations overlaps with the management monitoring data. . For this reason, it is possible to superimpose short-circuit information and disconnection information by judgment of the child station, even if the confirmation object is not specified by management control data. That is, when a short circuit or disconnection occurs in its own station, the child station checks that the transmitted data is normal information, updates the normal information with short circuit information or disconnection information, and the control unit that has short circuit or disconnection data. Alternatively, by updating the data corresponding to the sensor unit, the mother station side can easily confirm the wiring connection state between the child station and the controlled device.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram of the transmission system between a mother station and a child station in the Example of the remote wiring check system which concerns on this invention.
2 is a system configuration diagram showing a schematic configuration of the remote wiring check system.
3 is a system configuration diagram of the home country.
4 is a schematic diagram of an address table stored in a mother station.
5 is a timing chart of signals received between a mother station and a child station.
6 is a block diagram of a child station output unit.
7 is a block diagram showing a connection state between an output data unit and an actuator.
8 is a block diagram of a child station input unit.
9 is a block diagram showing a connection state between an input data unit and a two-wire sensor.
10 is a block diagram showing a connection state between an input data unit 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, this remote wiring check system includes a mother station 6 connected to the control unit 1 and common data signal lines DP and DN (hereinafter referred to as data signal lines DP and DN), and the data. A plurality of child stations 2 connected to the signal lines DP and DN and the corresponding controlled device 5 are provided. The controlled device 5 has a controlled unit 51 that operates in response to an output instruction of the controller 1, and a sensor unit 52 that transmits input information to the controller 1. The controlled part 51 is comprised from various components which comprise the controlled device 4, for example, an actuator, a (stepping) motor, a solenoid, a solenoid valve, a relay, a thyristor, a lamp, and the like. On the other hand, the sensor unit 52 is selected in response to the corresponding controlled unit 51, and is made of, for example, a reed switch, a micro switch, a rolling switch, an optical sensor, and outputs an on-off state (two-value signal). do. In this embodiment, an actuator is used as the control unit 51 and a two-wire sensor and a reed switch (hereinafter referred to as a contact point sensor) are used as the sensor unit 52. The actuator 51 will be described below. 2 wire type sensor 52a and contact point sensor 52b.

The control part 1 is a programmable controller, a computer, etc., for example, The output unit 11 which transmits the control data 13 and the initialization (initialize) signal data 14, and the sensor on the side to be controlled 4 are controlled. It has an input unit 12 which receives data (data of a monitoring data signal) 15 and connection data 16. The output unit 11 and the input unit 12 are connected to the mother station 6.

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

The output data unit 61 transmits the parallel data received as the control data 13 from the output unit 11 of the control unit 1 to the mother station output unit 64. This control data 13 gives an operation instruction of the actuator 51.

The IDX address data section 62 stores IDX address data in an IDX address table 68 provided therein. The IDX address data is data for specifying the child station 2 to which the actuator 51, the two-wire sensor 52a, or the contact point sensor 52b, to which the wiring state is to be checked, is connected. ) Is used. In this embodiment, since the two actuators 51, or the two-wire sensor 52a and the contact point sensor 52b are connected to one child station 2, the head address is shown in Fig. 4A. As shown, it becomes one address across one, such as # ad0, # ad2, and so on. These IDX address data are transmitted to the control data generating means 73 and the connection data detecting means 79. In addition, although the initial setting signal data 14 is received and the table shown in Fig. 4A is generated, the generation procedure thereof will be described later. In addition, the addresses # ad0, # ad2, etc. shown in FIG. 4 are addresses assigned every one cycle of the transmission clock signal described later.

The timing generator 63 is composed of an oscillator circuit (OSC) 71 and a timing generator 72, and the timing generator 72 generates a timing clock of this transmission system based on the OSC 71. Transfer to the mother station output unit (64). The mother station output section 64 is composed of the control data generating means 73 and the line driver 74, and the control data generating means 73 receives the output data from the output data 61 and the IDX address data 62. Based on the data and the timing clock received from the timing generator 63, a control data signal is generated and sent to the data signal lines DP and DN via the line driver 74. The line driver 74 further receives a power supply from the DC power supply 75, and supplies the circuit power of the child station 2 with the control data signal via the common data signal lines DP and DN.

Control data signal (equivalent to a series of pulsed voltage signals in the present invention) transmitted from the mother station output section 64 to the data signal lines DP and DN, hereinafter, control data flowing through the data signal lines DP and DN. The data value of the signal, referred to as a transmission clock signal, is represented by a pulse width of a high period of the voltage level in one period of the timing clock. As shown in Fig. 5, the transmission clock signal has a high potential level (+ 24V in this embodiment) at the second half of one cycle and a low potential level (+ 19V in this embodiment) at the first half. The width of the high potential level is expanded in response to the value of each data of the control data 13 input from the control unit 1. In this embodiment, when one cycle of the transmission clock signal is set to t0, it is extended to (3/4) t0. However, the width is not limited and may be appropriately adjusted depending on the transmission conditions. In addition, there is no restriction on the representation format of the data value, and other representation formats such as high and low voltage levels and the presence or absence of a current may be appropriately employed. Further, an address is assigned every one period of the transmission clock signal. In this embodiment, each of address 0 (# ad0), 1 (# ad1), 2 (# ad2), and 3 (# ad3), respectively. The value (output data) of the control data in the figure represents "0", "0", "1", and "0", respectively.

1 schematically shows this transmission procedure. In this transfer procedure, after the start signal ST, the control / monitoring data area composed of the control data out0 to outn and the monitoring data in0 to inn is continued, and thereafter, the connection data CDT is stored. Overlapping management data areas continue. The child station 2 takes control data that the own station should receive by counting the allocated address every one period of the transmission clock signal. The count of the address starts from the end of the first start signal ST of the transmission clock signal. The start signal ST is a potential level equal to the high potential level of the transmission clock signal, and is a signal longer than one period of the transmission clock signal.

The mother station input unit 65 is constituted of a monitoring signal detecting unit 76 and a monitoring data extracting unit 77 to transmit input data to the input data unit 66. The monitoring signal detecting means 76 detects the monitoring data signal and the connection data signal sent out from the child station 2 via the common data signal lines DP and DN. In the monitoring data signal transmitted from the child station 2, the presence or absence of detection of the detection target in the two-wire sensor 52a or the contact point sensor 52b is expressed as a current level, and the start signal ST is transmitted. After that, it receives sequentially from each child station (2). Further, the connection data signal is a binary number indicating the response (initial confirmation signal) of the child station 2 to the initial confirmation described later or the wiring state of the actuator 51, the two-wire sensor 52a, and the contact sensor 52b. Is connected as a current level. Then, the monitoring data of the monitoring data signal and the connection data of the connecting 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 portion 66 and the serial data are input. It is sent to the management monitoring data extraction means 78.

The input data unit 66 which has received serial input data from the mother station input unit 65 converts the serial input data into parallel (parallel) data, and inputs the input unit 12 of the control unit 1 as the sensor data 15. To pass). On the other hand, the management monitoring data extraction means 78 extracts the connection data from the input data, and transfers the connection data to the connection data detection means 79. When the connection data detecting means 79 generates the IDX address table 68, the connection data detecting unit 79 transmits the extracted information to the IDX address data section 62 and confirms the connection state. The connection data is transmitted to the input data section 66. The input data part 66 which received the connection data transfers it to the input unit 12 of the control part 1 as the connection data 16 which shows normal, disconnection, or a short circuit.

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

The child station 2 includes a child station output unit 30 and a child station input unit 40, each of which is connected to the data signal lines DP and DN, so that the two-wire sensor 52a or the contact point sensor 52b is provided. Transmits the signal received from the data signal to the data signal lines DP and DN as the monitoring data signal, extracts necessary information from the transmission clock signal transmitted on the data signal lines DP and DN, and operates the actuator 51. FIG. .

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

In addition, the child 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 child station data output unit 33, And the process in each of the output data part 34 is performed by MCU39. And the calculation and memory required in each process are performed using the CPU, RAM, and ROM which the MCU 39 has. 6, the relationship with CPU, RAM, and ROM in each process is abbreviate | omitted for the convenience of description.

The address setting means 31 recognizes the address value set by the address setting switch (not shown) and transfers it to the address extraction means 32. Note that the setting of the address is not limited to a mechanical method by a switch or the like, and may be performed by, for example, transmitting a preset value from the mother station 6 and storing it.

The local address recognized by the address setting means 31 is transmitted to the address extraction means 32, and the transmission clock signal is transmitted from the data signal lines DP and DN via the control data signal extraction means 36. The address extraction means 32 obtains the data of the local station address based on this information, and transfers the data to the child station data output means 33. The data transmitted to the child station data output means 33 is transmitted to the output data section 34 again, and the actuator 51 operates based on these data. Further, these series of processes are performed in synchronization with the clock of the transfer 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, short or disconnected state (connected state) based on a voltage value caused by 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 to the data signal lines DP and DN via the output Iout1 as normal information, short circuit information, or disconnection information. Specifically, normal information is sent as "11", short-circuit information is "10", and disconnection information is transmitted as binary data of "01". However, there is no restriction on the representation format of the data, and the representation format according to the use situation can be appropriately selected.

The detection principle of the change of current is shown in FIG. As shown in FIG. 7, when the actuator 51 operates normally, the operating current iw flows through the solenoid valve 53 of the actuator 51, but between the output data portion 34 and the actuator 51. When a short circuit occurs in the wiring, the short circuit current is flowing without passing through the solenoid valve 53. Since this short-circuit current is larger than the operating current iw, the voltage drop in the detection resistor Rd provided in the output data part 34 becomes large. In addition, when the wiring between the output data part 34 and the actuator 51 is disconnected, a current does not flow to the detection resistor Rd, and the voltage drop becomes zero. Therefore, by detecting the voltage drop of normal, short circuit, and disconnection by the A / D converter, the information of the connection state can be obtained. The transistor Trd is connected to the detection resistor Rd in series, and the base onN of the transistor Trd is turned "on" only when there is an output instruction to the actuator 51. Here, the detection may be made effective only when the base onN is "on". In this embodiment, when the current calculated from the voltage drop is smaller than the first threshold (for example, one fifth of the operating current iw), the operation current iw is broken. If it is larger than the second larger threshold value (for example, 5 times the operating current iw), it is determined as a short circuit. In addition, although FIG. 7 relates to the connection terminal outN, since the operation is the same also about the connection terminal outN + 1, description is abbreviate | omitted.

This child station output section 30 does not have a special power supply, but is used in the child station output section 30 from a transmission clock signal in which power supplied from the common data signal lines DP and DN is superimposed. The power supply voltage is produced by a diode, a capacitor, and a three-terminal power supply element.

As illustrated in FIG. 8, the child station input unit 40 includes an address setting unit 41, an address extraction unit 42, a child station data input unit 43, an input data unit 44, and a sensor connection detection unit 45. And control data signal extraction means (46). Moreover, two connection terminals inN and inN + 1 are provided, the contact point sensor 52b is connected to the connection terminal inN, and the 2-wire sensor 52a is connected to the connection terminal inN + 1. The child station input unit 40 also includes a microcomputer control unit (MCU) 49 similarly to the child station output unit 30, and includes an address setting unit 41, an address extraction unit 42, The processing in each of the child station data input means 43 and the input data unit 44 is performed by the MCU 49. In addition, the address setting means 41, the address extraction means 42, and the control data signal extraction 46 include the address setting means 31, the address extraction means 32, and the control of the child station output section 30. Since the structure is substantially the same as that of the data signal extracting means 36 and performs almost the same operation, the description thereof is omitted. In FIG. 8, similarly to FIG. 6, the relationship between the CPU, RAM, and ROM in each processing is omitted for convenience of explanation.

The input data section 44 transmits one or more (bit) data signals input from the corresponding two-wire sensor 52a and the contact sensor 52b to the child station data input means 43. The data transmitted here is held by the child station data input means 43. In the child 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 " in response to one or more pieces of data held. When the signal Iout0 is "on", the transistor 47 is turned "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 to each of the two-wire sensor 52a and the contact sensor 52b, and becomes a serial signal. In other words, the child 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 period of the transmission clock signal. 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) equal to or greater than the predetermined value Ith flows, and in the case of " 0 " For example, only 10 mA) is represented. Thus, for example, the monitoring data in each of address 0 (# ad0), 1 (# ad1), 2 (# ad2), and 3 (# ad3) of the signal shown in FIG. 0 "," 0 "," 1 ", and" 0 ".

The sensor connection detection part 45 is equipped with the A / D converter similarly to the actuator connection detection part 35. As shown in FIG. The A / D converter is connected to the input data section 44 based on a voltage value caused by a change in current flowing between the two-wire sensor 52a or the contact sensor 52b. Connection status) is detected. The sensor connection detection unit 45 sends the detected connection state to the data signal lines DP and DN via the output Iout1 as normal information, short circuit information, or disconnection information. Specifically, normal information is sent as "11", short-circuit information is "10", and disconnection information is transmitted as binary data of "01". However, there is no restriction on the representation format of the data, and the representation format according to the use situation can be appropriately selected.

9 and 10 show the principle of detecting the change of current. First, in the case of the 2-wire sensor 52a, as shown in FIG. 9, when the magnetic body 54 mounted as a detection object approaches, a detection current ic flows, and the circuit current ia in a sensor always flows minutely. It becomes the sum total value of ib + ic of the standby current ib of micro (micro) and a detection current ic. When a short circuit occurs in the wiring between the input data section 44 and the two-wire sensor 52a, a short circuit current is greater than this total value ib + ic. For this reason, the voltage drop in the detection resistor Rd provided in the input data section 44 increases. When the wiring between the input data section 44 and the two-wire sensor 52a is disconnected, no current flows through the detection resistor Rd, and the voltage drop is zero. Therefore, by detecting the voltage drop of normal, short circuit, and disconnection by the A / D converter, the information of the connection state can be obtained. Further, in this embodiment, the calculated current value via the A / D converter is less than the first threshold value (for example, one fifth of the sum of the standby current ib and the normal detection current ic). If it is small, it is a disconnection, and if it is larger than the second threshold value (for example, five times the value of the normal detection current ic), it is determined as a short circuit.

Since the current change between the wiring of the input data part 44 and the contact sensor 52b is also detected similarly, about the connection state of the input data part 44 and the contact point sensor 52b shown in FIG. 9, the same code | symbol is attached | subjected to the substantially same part, and the description is abbreviate | omitted. The connection state shown in FIG. 10 differs in the point provided with the breather resistance Rb compared with what is shown in FIG. The contact point sensor 52b closes the contact when the magnet 55 approaches (or may be dropped), so that the detection current ic flows, so that the current does not flow in the open state. Here, the breather resistor Rb is connected in parallel with the contact so that the breather current ib can flow even when the contact is open. This breather resistor Rb is contained in the connection connector 56, and flows a breather current ib corresponding to the standby current ib of the main body portion of the contact sensor 52b in FIG.

In addition, the child station input unit 40 also supplies power from the superimposed transmission clock signal to the diode, capacitor, and three-terminal power supply elements from the superimposed transmission clock signal in the same way as the child station output unit 30. It is made by.

In the above configuration, as shown in Fig. 1, from the mother station 6, the control signal out0 and out1 of the child station 2 of the start signal ST and the first (# ad0 and # ad1) following it are shown. , The control data (out2 and out3) of the second child station 2 (ad2 and ad3) subsequent to this, and then the control data of the last child station 2 are likewise sent out, Index address data IDX is sent out. On the other hand, each monitoring data in0 to inn is sent from the child station 2 within the same clock cycle period as the control data, and thereafter, the actuator 51, the two-wire sensor 52a, and the contact point sensor ( The identifier data ADS and the connection data CDT for specifying 52b) are sent. In this transfer procedure, the management data area is a region in which # ad0 to #adn contain the control / monitoring data area, the index address data IDX, the identifier data ADS, and the connection data CDT. The index address data IDX corresponds to the management control data, and the identifier data ADS and the connection data CDT correspond to the management monitoring data. The signal transmission between the mother station 6 and each child station 2 is repeatedly performed during the operation of the system.

The control data out0 to outn are output instruction data for the actuator 51 and are output data via the control data signal extracting means 36 and the child station data output means 33 in the child station output section 30. It is transmitted to the part 34, and the actuator 51 operates based on this data. For example, if the actuator 51 operates when the control data is "1", the actuator 51 corresponding to # ad2 will operate when shown in FIG.

On the other hand, the monitoring data in0 to inn are information from the two-wire sensor 52a and the contact sensor 52b. In the same manner to the above, one or a plurality of (bit) data input from these sensors are input. It is sent from the child station data input means 43 received. For example, if the monitoring data is "1" when the object is detected by the sensor, the sensor corresponding to # ad2 detects the object when 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 to be checked for the wiring state. In this embodiment, the children to which they are connected are connected. The head address of the child station 2 is used as data for designating the station 2. The mother station 6 first selects the index address data # ad0 of the table number 0 from the index address data group stored in the IDX address table 68 and transmits it. Subsequently, for each frame transfer cycle, index address data corresponding to each table number is sequentially transferred. In each child station 2, when the address assigned to the own station coincides with the data value of the index address data IDX, the actuator 51 connected to the own station, the two-wire sensor 52a, or the contact point sensor 52b. ), When disconnection or short circuit occurs, the identifier data ADS (relative address to the head address of the child station 2, such as the actuator 51) and the connection data CDT are sent. At this time, the transmitted connection data CDT becomes "01" for disconnection and "10" for short circuit. If the connection state is normal, " 11 " is sent as the connection data CDT without sending the identifier data ADS. When disconnection occurs in the connection between the mother station 6 and the child station 2, since the data is not transmitted from the child station 2, the connection data CDT is " 00. " That is, when the connection data CDT is not sent any of the paragraph information "10", the disconnection information "01", or the normal information "11" with respect to the address (representative address data) assigned to the child station 2, It is possible to determine that a disconnection has occurred in the connection between the mother station 6 and the child station 2.

In addition, when both of the two actuators 51 connected to the child station 2, or both the two-wire sensor 52a and the contact point sensor 52b are disconnected or short-circuited, the child station 2 In accordance with a predetermined order, first, either connection data CDT is sent. Then, when this connection data CDT is normal, that is, when it becomes "11", the other connection data CDT is sent out.

The IDX address table 68 is created by the initial setting command from the control unit 1. The master station 6 receiving the initial setting signal 14 indicating the initial setting command has until the maximum address value is reached for each of the index address data IDX in the management data area of the transmission clock signal every one frame transfer cycle. We add one by one. Each child station 2 returns a response of " 11 " as the connection data CDT when the address (head address) assigned to the own station matches the data value of the index address data IDX. When the connection data CDT is " 11 ", the index address is extracted from the connection data detecting means 79 of the mother station 6, and the head address is in the internal memory provided in the IDX address data portion 62. It is stored as data.

In this embodiment, the head address of the child station 2 is stored in the IDX address table 68, but the plurality of actuators 51, the two-wire sensor 52a, and the contact point sensor 52b are stored. The addresses given to each of the following may hereinafter be referred to as all addresses. In this case, as shown in Fig. 4B, the IDX address table 68 stores all of the addresses allocated for each period of the transmission clock signal. In addition, when the head address of the child station 2 is used for the index address data IDX, the number of cycles required for designation of 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 is possible to perform a simple process of only adding one by one until the maximum address value is reached for each frame transmission cycle, and the IDX address table 68 as necessary. ) Can be omitted.

In addition, in this embodiment, although the index address data IDX is used as data for designating the actuator 51, the 2-wire sensor 52a, or the contact sensor 52b which are the confirmation object of the wiring state, The child station 2 which has confirmed the disconnection or short circuit may send the information by itself without designating a confirmation target from the mother station 6. In this case, the index address data IDX of the management data area shown in FIG. 1 becomes blank, and the child station 2 having a short circuit or disconnection at its own station confirms that the connection data CDT is normal information "11". After that, the connection data CDT is updated to short circuit information "10" or disconnection information "01", and the identifier data ADS is shorted or disconnected, the actuator 51, the 2-wire sensor 52a, or the contact sensor Update to the absolute address of 52b.

In this embodiment, although the connection state between the child station 2 and the actuator 51, the two-wire sensor 52a, or the contact point sensor 52b is displayed as the connection data CDT, each child station is displayed. The internal wiring state of (2), that is, the problem of each child station 2 may be displayed. In this case, each child station 2 is provided with a well-known check circuit for confirming internal wiring of its own station, and if the check result is transmitted to the mother station 6 as connection data (CDT), a child station having a problem occurs. It becomes possible to confirm (2) easily at the mother station 6 side.

1: control unit
2: child country
5: controlled device
6: motherland
11: output unit
12: input unit
13: control data
14: Initial setting signal data
15: sensor data
16: connection data
30: child station output unit
31: address setting means
32: address extraction means
33: means for outputting child station data
34: output data section
35: actuator connection detection unit
36: control data signal extraction means
37, 47: transistor
39, 49: MCU
40: Child country input section
41: address setting means
42: address extraction means
43: means of data entry for child stations
44: input data section
45: sensor connection detection unit
46: control data signal extraction means
51: controlled part (actuator)
52: sensor unit
52a: 2-wire sensor
52b: contact sensor
53: solenoid valve
54: magnetic material
55: magnet
56: connector
61: output data section
62: IDX address data section
63: timing generator
64: home station output
65: home input
66: input data section
67: transmission breather current circuit
68: ID address table
71: oscillator
72: timing generating means
73: control data generating means
74: line driver
75: DC power
76: monitoring signal detection means
77: monitoring data extraction means
78: management monitoring data extraction means
79: connection data detection means

Claims (9)

A mother station connected to a control unit and a common data signal line, and a plurality of child stations connected to the common data signal line and a corresponding controlled device,
The controlled device has a controlled unit which operates in response to an output instruction of the controller and / or a sensor unit which transmits input information to the controller,
The mother station has a timing generating means for generating a predetermined timing signal synchronized with a clock of a predetermined period, and under the control of the timing signal, a series of control data signals are generated as a control data signal in response to a value of control data from the control unit. Outputting a pulsed voltage signal to the data signal line, extracting a data value of the supervisory data signal superimposed on the series of pulsed voltage signals every one cycle of the clock under the control of the timing signal, and transferring it to the controller. and,
Each of the plurality of child stations extracts a value of each data of the control data signal every one period of the clock under the control of the timing signal and corresponds to a locality among the values of the respective data. Transmits data to the corresponding control unit and / or transmits the monitoring data signal to the series of pulsed voltage signals in response to the value of the monitoring data corresponding to the sensor unit every one period of the clock signal under the control of the timing signal. In the control and monitoring signal transmission system superimposed on
And a management data area including connection data indicating a wiring state different from a control / monitoring data area constituted of the control data and the monitoring data in the series of pulsed voltage signals. The method according to claim 1,
In the connection data, short-circuit information, disconnection information and normal information are identified. The method according to claim 1 or 2,
And the identifier data of the control unit and the sensor unit transmitted from the child station in the management data area. The method according to claim 1 or 2,
And a control wiring data from the mother station for designating each of the control unit and the sensor unit in the management data area. The method according to claim 4,
As the management control data, representative address data of the child station to which a plurality of the specified controlled unit and sensor unit are connected are superimposed, and the connection data is selected from among the short circuit information, disconnection information, or normal information with respect to the representative address data. And when none is transmitted, it is determined that a disconnection has occurred in the connection between the mother station and the child station. The method according to claim 2,
When the child station checks that the connection data is normal information when a short circuit or disconnection occurs in the own station, the child station overlaps the identifier data of the control unit and the sensor unit in which the short circuit or disconnection occurs in the management data area, and the normal A remote wiring check system for updating information to the short circuit information or the disconnection information. The method according to claim 2,
In the sensor section, when the non-operating current of the sensor section is extremely small, a breather current flows between the outputs of the sensor signals to be detected, and all currents including both the breather current and the operating current of the sensor section have a first threshold value. The short circuit is judged to be the disconnection when it is small compared with the remote wiring check system which judges the short circuit when all the currents are larger than the 2nd threshold value. The method according to claim 2,
In the controlled part, when there is an output instruction to the controlled part, it is determined as the disconnection when the output current is smaller than the first threshold value, and the output current is larger than the second threshold value larger than the operating current. The remote wiring check system which judges that the said short circuit is large when large. A mother station connected to a control unit and a common data signal line, and a plurality of child stations connected to the common data signal line and a corresponding controlled device,
The controlled device has a controlled unit which operates in response to an output instruction of the controller and / or a sensor unit which transmits input information to the controller,
The mother station has a timing generating means for generating a predetermined timing signal synchronized with a clock of a predetermined period, and under the control of the timing signal, a series of pulsed voltage signals as a control data signal in response to a value of control data from the controller. Outputs to the data signal line, extracts a data value of the supervisory data signal superimposed on the series of pulsed voltage signals every one period of the clock under the control of the timing signal, and transmits the data value to the control unit;
Each of the plurality of child stations extracts a value of each data of the control data signal every one period of the clock under the control of the timing signal, and supplies the data corresponding to the own station among the values of the respective data to the controlled unit. And superimpose the supervisory data signal on the series of pulsed voltage signals in response to the value of the supervisory data of the sensor unit corresponding to each cycle of the clock signal under the control of the timing signal, and / or
In the remote wiring check system provided with the series of pulse type voltage signals, a management data area including a connection data indicating a wiring state different from the control / monitoring data area composed of control data and monitoring data.
And a breather resistor interposed between the sensor portion and the child station and connected in parallel with the detection portion of the sensor portion.

Images