JP6938787B2 - Control / monitoring signal transmission system slave station survival confirmation method - Google Patents

Description

In the present invention, the signal line between the master station provided on the control side and the plurality of slave stations provided on the controlled side is reduced in wiring, connected by a common transmission line, and synchronized by a transmission clock. It relates to a method for confirming the survival of a slave station in a control / monitoring signal transmission system that transmits data by a transmission synchronization method.

In a control system including a control unit, a plurality of output units and an input unit, or a plurality of controlled devices, so-called wiring saving, which reduces the number of wirings, is widely implemented. Then, as a general method for saving wiring, a parallel signal and a serial signal are replaced with a parallel connection in which each of a plurality of output units and input units or signal lines extending from a controlled device are directly connected to the control unit. A master station and a plurality of slave stations having a conversion function of are connected to a control unit and a plurality of output units and an input unit, or a plurality of controlled devices, respectively, and common data is shared between the master station and a plurality of slave stations. A method of exchanging data by a serial signal via a signal line is widely adopted.

However, in a system in which a large number of slave stations are connected and wiring is saved, depending on the content of the data transmitted from the slave station, data transmission / reception with the slave station is normal, that is, the slave station survives in the system. It may not be possible for the control unit to confirm that this is the case. For example, if only the data indicating that the sensor was detected is transmitted and no data is transmitted when there is no sensor detection, the cause of the continuous state of not receiving the data is due to the absence of the sensor detection. The control unit could not determine whether it was due to the fact that the slave station was not alive, and the survival of the slave station could not be confirmed. In such a case, it is necessary to check each slave station far away from the control unit, which causes a problem that requires a lot of man-hours and time.

Therefore, in Japanese Patent No. 4933686, the applicant can detect a transmission line disconnection on the control unit side, which is one of the causes of causing a problem in data transmission / reception with a slave station. We are proposing a method. In this transmission line disconnection detection method, the address of an arbitrary slave station is specified in the management control data (comparison data) output from the master station in the management data area provided in the transmission signal, and the own station address is specified. The slave station outputs its own station address data (individual specific data) as management monitoring data to the management data area, and the control side determines whether or not there is a disconnection based on the comparison and collation result of the individual specific data and the comparison data.

In addition to the disconnection of the transmission line, failure of the slave station and poor power supply can be cited as causes of problems in sending and receiving data to and from the slave station. It is not possible to output individual specific data for the designation of the station address. Therefore, according to the transmission line disconnection detection method, the survival of the slave station can be confirmed.

Japanese Patent No. 4933686

The slave station used for wiring saving of the transmission signal generally does not have a device-specific identifier such as the MAC address of Ethernet. Therefore, in the method of exchanging data by serial signal between the master station and a plurality of slave stations via a common data signal line, the data area of the transmission signal is allocated to each of the plurality of slave stations and assigned to the own station. An address for obtaining the timing of the data area is set in each slave station. Then, each of the plurality of slave stations exchanges data with the master station in the data area assigned to the own station, thereby preventing a collision between transmission and reception of the plurality of slave stations.

However, if multiple output devices are to perform the same operation, or if the input of any of the multiple input devices is required, and multiple addresses are set for multiple slave stations, one address will be used for multiple addresses. The slave station of will be specified. Therefore, even if one of the specified multiple slave stations is not alive, if a normal response is returned from the other slave station, it is mistaken that all the slave stations are alive. It will be.

That is, the conventional method of confirming the survival of a slave station by using an address set when data is exchanged by a serial signal between a master station and a plurality of slave stations via a common data signal line is available. It could not be applied to a system in which the address is duplicated in multiple slave stations.

Therefore, according to the present invention, in a control / monitoring signal transmission system that transmits data by a transmission synchronization method, slave station survival can be confirmed even when addresses are duplicated in a plurality of slave stations. The purpose is to provide a confirmation method.

The slave station survival confirmation method according to the present invention includes a plurality of slave stations that transfer data by a transmission synchronization method via a transmission line common to the control side device, and IO control for the slave station is performed in the transmission procedure. In a control / monitoring signal transmission system provided with a management data area different from the IO data area composed of data and IO monitoring data superimposed by the slave station, one of a predetermined number of numerical values is provided for each slave station. One is set as the primary temporary address, and the inquiry step, the duplication determination step, the secondary temporary address setting step, and the primary temporary address resetting step are repeated until there is no duplication of the primary temporary address.

In the inquiry step, all numerical values that may be set as primary temporary addresses are sequentially designated from the control side device via the management data area, and an inquiry to the slave station is executed.

In the duplication determination step, the presence or absence of duplication of the primary temporary address is determined based on the reply from the slave station whose designated numerical value matches the primary temporary address via the management data area.

In the secondary temporary address setting step, a secondary temporary address in which a predetermined eigenvalue is added to the unique primary temporary address is generated, and the slave station in which the primary temporary address constituting the secondary temporary address is set is set. The secondary temporary address is set in the management data area.

In the primary temporary address resetting step, the primary temporary address is reset to the slave station in which the primary temporary address having duplication is set.

The eigenvalues constituting the secondary temporary address are set to different values each time the primary temporary address is reset, and different secondary temporary addresses are set for each slave station.

After the secondary temporary address that is different for each slave station is set, the positive address that indicates the start position of the data area in the IO data area assigned to each of the slave stations is different for each slave station. A unique identifier is set for each of the slave stations using the secondary temporary address via the management data area.

Then, after the unique identifier that is different for each slave station is set, the unique identifier is designated in the management data area, and the designated unique identifier matches the unique identifier set in the own station. Detects the presence or absence of a response from the station.

The secondary temporary address may be the unique identifier.

A different number of unique identifiers may be set corresponding to the plurality of IO connection points of the slave station.

A label different from the unique identifier may be set for each slave station, or the label may include a character string.

In the present invention, the label is intended to represent the model of the device and the installation location of the device with contents that can be recalled by a person. For example, OL1 and OL2, which are a combination of a character reminiscent of an output device and a character reminiscent of a lighting device, and a number of an installed room, are applicable. As long as the model of the device and the installation location of the device can be recalled by a person, only numbers may be used.

According to the slave station survival confirmation method according to the present invention, a positive address indicating the start position in the IO data area of the data area in the IO data area assigned to each slave station and a unique identifier different for each slave station are set and managed. Since the presence or absence of a response from a slave station whose unique identifier specified in the data area matches the unique identifier set in the own station is detected, even if the primary address is duplicated in multiple slave stations, the slave station You can confirm the survival.

It is a system configuration diagram which shows the schematic structure of the control / monitoring signal transmission system which performs the survival confirmation of a slave station by the slave station survival confirmation method which concerns on this invention. It is a system configuration diagram of a master station. It is a system configuration diagram of an input slave station. It is a system block diagram of the address setting means. It is a system configuration diagram of an output slave station. It is a schematic diagram of the transmission system between a master station and a slave station. It is a time chart diagram of a transmission clock signal. It is a figure which shows the flow of processing until a unique identifier is set. The IO control data extracted from the transmission signal by the output slave station in which the positive address is duplicated is shown, (a) is a schematic diagram when the positive address is duplicated, and (b) is different for each output slave station. It is a schematic diagram when a positive address is set.

An embodiment of the transmission line disconnection detection method according to the present invention will be described with reference to FIGS. 1 to 9.
FIG. 1 is a configuration diagram of a control / monitoring signal transmission system to which the transmission line disconnection detection method according to the present invention is applied. This control / monitoring signal transmission system is for centralized control of a large number of devices and devices arranged in a facility such as a factory in a control unit. As shown in FIG. 1, the master station 2 connected to the control unit 1, the common data signal line DP and DN (hereinafter referred to as a transmission line), and the master station 2 arranged in the facility on the controlled side and connected to the transmission line. It is composed of a plurality of input slave stations 4, output slave stations 5, and input / output slave stations 6. Although FIG. 1 shows one input slave station, two output slave stations, and one input / output slave station for convenience of illustration, the type and number of slave stations connected to the transmission line are shown. There is no limit to.

The input unit 7 to which the input slave station 4 is connected, the output unit 8 to which the output slave station 5 is connected, and the input / output unit 9 to which the input / output slave station 6 is connected are arranged in the facility to be controlled. It is a device.

Examples of the input unit 7 include, but are not limited to, reed switches, micro switches, push button switches, photoelectric switches, and various other sensors.

Examples of the output unit 8 include, but are not limited to, actuators, (stepping) motors, solenoids, solenoid valves, relays, thyristors, and lamps.

The input / output unit 9 is a device having the functions of both the input unit 7 and the output unit 8. For example, a device such as a temperature controller, a timer, or a counter that has both a function of transmitting information to the master station 2 and a function of performing an output operation based on the data transmitted from the master station 2 can be mentioned. can.

The input unit 7 may be an input unit integrated slave station 70 integrated with the input slave station 4. Further, the output unit 8 may be an output unit integrated slave station 80 integrated with the output slave station 5.

The control unit 1 includes a management determination means 11 having an arithmetic processing function and an input / output unit 12. The management determination means 11 receives data from the master station 2 via the input / output unit 12 and performs necessary arithmetic processing based on the program stored internally.

<Structure of master station>
As shown in FIG. 3, the master station 2 includes an output data unit 21, a management data unit 22, a timing generation unit 23, a master station output unit 24, a master station input unit 25, an input data unit 26, and a comparison determination unit 27. .. Then, the control signal, which is connected to the transmission line and is a series of pulsed signals, is superimposed on the transmission line, and the input slave station 4, the output slave station 5, and the input / output slave station 6 (hereinafter, the input slave station 4 and the output slave) are superimposed. When all of the station 5 and the input / output slave station 6 are targeted, the monitoring data extracted from the monitoring signal superimposed on the transmission line from the slave stations 4, 5, and 6) is used as the input / output unit of the control unit 1. Send to 12.

The output data unit 21 delivers the control parallel data 13 from the output unit 11 of the control unit 1 to the master station output unit 24 as serial data.

The management data unit 22 includes a storage means 29 having a non-volatile function for storing the slave station information table. Then, based on the data received from the control unit 1 and the slave station information table, the data required for instructing the slave station in the management control data area described later is delivered to the master station output unit 24 as serial data.

The slave station information table has a positive address indicating the start position in the IO data area of the data area in the IO data area assigned to each of the slave stations 4, 5 and 6, and the slave station side that cannot be obtained by using the IO data area. Contains unique identifiers for designating slave stations 4, 5, and 6 that output the information of.

As for the positive addresses and unique identifiers of the slave stations 4, 5 and 6, the secondary temporary addresses obtained by adding a predetermined eigenvalue to the primary temporary addresses set based on random numbers are all the slave stations 4, 5 and 6, as described later. After being set to 6, the secondary temporary address is used and set to all slave stations 4, 5 and 6. Then, in the management data unit 22, the secondary temporary address table is created and stored by the procedure described later.

The timing generation unit 23 includes an oscillation circuit (OSC) 31 and a timing generation means 32, and the timing generation unit 32 generates a timing clock of this system based on the oscillation circuit (OSC) 31 to generate a master station output unit 24 and a parent. Hand over to the station input unit 25.

The master station output unit 24 includes a control data generating means 33 and a line driver 34. The control data generating means 33 superimposes the transmission signal as a series of pulse-like signals on the transmission line via the line driver 34 based on the data received from the output data unit 21 and the timing clock received from the timing generation unit 23.

As shown in FIG. 6, the transmission procedure is a one-frame cycle following the IO data area and the management data area between the start signal ST of the transmission signal and the next start signal ST, and a plurality of pulse signals are connected in succession. It is composed. The start signal ST is longer than the time width of the pulse signal and has a potential level higher than the threshold Vst (18 V in this embodiment) for generating the transmission clock signal from the transmission signal.

As shown in FIG. 7, the pulse signal constituting the transmission signal is composed of a power supply voltage area having a power supply voltage level higher than the threshold value Vst and a low potential area having a potential level lower than the threshold value Vst.

The power supply voltage area corresponds to the transmission clock signal, which is + 24V in this embodiment. The power supply voltage level is not limited and can be appropriately determined according to the usage environment and usage conditions. It may be a negative power supply.

Further, in this embodiment, the power supply voltage area is the latter half of one cycle and the low potential area is the first half of one cycle, but the order is not limited and these orders may be reversed. The same applies when the power supply voltage level is a negative power supply. In the case of a negative power supply, the low potential area in this embodiment is a high potential area with respect to the power supply voltage area.

The width of the low potential area represents the data of the control signal. The width of the low potential area constitutes a control data area as control data, and the control data area corresponds to the upper part of the IO data area and the management data area in FIG. The control data area in the management data area is hereinafter referred to as a management control data area.

In this embodiment, when one cycle of the pulse signal constituting the transmission signal is t0, the pulse width (3/4) t0 of the pulse signal constituting the transmission signal represents the logical data “1”, and the pulse width (1). / 4) t0 represents the logical data "0". However, as long as it corresponds to the value of the control data input from the control unit 1, the length is not limited and may be appropriately determined.

A current signal is also superimposed on the low potential area, and the presence or absence of this current signal represents the data of the monitoring signal. The current superimposed on the low potential area constitutes a monitoring data area as monitoring data, and the monitoring data area corresponds to the lower part of the IO data area and the management data area in FIG. The monitoring data area in the management data area will be referred to as the management monitoring data area below.

In this embodiment, the current signal smaller than 10 mA represents the logical data “0”, and the current signal larger than 10 mA represents the logical data “1”.

In the management control data area, the first management control data ISTo that gives an instruction such as requesting information to the slave stations 4, 5 and 6 and the unique identifier set for each slave station 4, 5 and 6 are stored. The designated second management control data IDXo is input from the master station 2. Further, in the management monitoring data area, the first management monitoring data STi and the second management monitoring data IDXi corresponding to the first management control data ISTo from the slave stations 4, 5 and 6 designated by the second management control data IDXo are located. Entered. Further, in the management monitoring data area, the survival confirmation monitoring data Ri is input from the slave stations 4, 5 and 6 in which the unique identifier of the own station is specified by the second management control data IDXo.

The master station input unit 25 is composed of a monitoring signal detecting means 35 and a monitoring data extracting means 36. The monitoring signal detecting means 35 detects the monitoring signal superimposed on the transmission line from the slave stations 4, 6 and 7.

The monitoring data extracting means 36 delivers the corresponding data value to the input data unit 26 based on the detection result of the monitoring signal in the monitoring signal detecting means 35. In this embodiment, the logical data “1” is delivered to the input data unit 26 when the monitoring signal is detected, and the logical data “0” is delivered to the input data unit 26 when the monitoring signal is not detected.

Further, the monitoring data extraction means 36 delivers the management monitoring data superimposed on the management monitoring data area to the comparison determination unit 27 at the time of address setting described later. Then, the comparison / determination unit 27 performs comparison / collation using the element number and the comparison / collation data, which will be described later, and delivers the match or mismatch determination result to the management data unit 22.

The input data unit 26 converts the serial input data received from the monitoring data extraction means 36 into parallel data, and sends the IO monitoring data and the management monitoring data to the input unit 12 of the control unit 1.

<Configuration of input slave station>
As shown in FIG. 3, the input slave station 4 has a transmission / reception means 41, a management control data extraction means 42, an address extraction means 43, a profile data storage means 44, a management monitoring data transmission means 45, an input means 46, and IO monitoring data. A slave station input unit 40 having a transmission means 47, a management control instruction determination means 48, and an address setting processing means 49 is provided. Further, a slave station line receiver 51 and a slave station line driver 52 arranged between the slave station input unit 40 and the transmission line are provided.

The input slave station 4 of this embodiment includes an MCU which is a microcomputer control unit as an internal circuit, and this MCU functions as a slave station input unit 40.

The operations and storage required for the processing are executed using the CPU, RAM, and ROM provided in the MCU, but the CPU, RAM, and ROM in each processing of the above means constituting the slave station input unit 40 The relationship between the above will be omitted from the illustration for convenience of explanation.

The transmission / reception means 41 receives the transmission signal transmitted to the transmission line via the slave station line receiver 51, and delivers the transmission signal to the management control data extraction means 42, the address extraction means 43, and the management monitoring data transmission means 45.

The management control data extraction means 42 extracts management control data from the management control data area of the transmission signal. Then, when the second management control data IDXo matches the unique identifier of the own station stored in the profile data storage means 44, the first management control data ISTo is handed over to the management control instruction determination means 48 and for survival confirmation. The data to be the monitoring data Ri (logical data "1" in this embodiment) is delivered to the management monitoring data transmitting means 45.

The address extracting means 43 counts the pulse signals constituting the transmission signal starting from the timing at which the start signal ST indicating the start of the transmission clock signal ends (falling in this embodiment). The timing at which this count value matches the own station address (positive address) data set by the profile data storage means 44 is the timing at which the data area assigned to the own station of the transmission signal starts (hereinafter, "own station"). Area start timing ”).

The address extraction means 43 that has obtained the own station area start timing enables the IO monitoring data transmission means 47 during the period of the own station area.

The profile data storage means 44 stores profile data indicating the device characteristics of its own station, such as the type of input / output and the number of occupied points (occupied address) of the control / monitoring data area. The profile data storage means 44 also stores the primary temporary address, the secondary temporary address, the unique identifier, and the label described later.

The management monitoring data transmission means 45 counts the pulse signals constituting the transmission signal starting from the timing at which the start signal ST ends (falling down in this embodiment), and obtains the timing of the management data area. Then, when the data to be output as the management monitoring data is delivered, it is output to the transmission line as the management monitoring signal via the slave station line driver 52.

In this embodiment, in the primary temporary address confirmation process described later, the comparison determination data and its element number are delivered from the address setting processing means 49. Further, in the profile data transmission process described later, the profile data of the own station is delivered from the profile data storage means 44. Further, when the unique identifier set in the own station is specified, the data to be the survival confirmation monitoring data Ri is delivered from the management control data extraction means 42. If any response is requested from the master station 2 in the normal state after the address setting is completed, the management control instruction determination means 48 delivers the data according to the purpose of the management control.

The input means 46 delivers the data based on the input from the input unit 7 to the IO monitoring data transmitting means 47.

The IO monitoring data transmitting means 47 outputs the data delivered from the input means 46 as a monitoring signal to the transmission line via the slave station line driver 52 when it is enabled by the address extracting means 43. The monitoring signal is superimposed on the IO monitoring data area of the transmission procedure.

The management control instruction determination means 48 executes an appropriate output process based on the first management control data ISTo delivered from the management control data extraction means 42. In this embodiment, an instruction signal for executing the primary temporary address generation process and the primary temporary address confirmation process is output to the address setting processing means 49. Further, when executing the secondary temporary address confirmation process, the primary address confirmation process, and the unique identifier setting process, the data addressed to the own station included in the first management control data ISTo is delivered to the profile data storage means 44. Further, when the profile data transmission process is executed, a signal instructing the data transmission is output to the profile data storage means 44.

<Primary temporary address generation process>
As shown in FIG. 4, the address setting processing means 49 is composed of an address generation means 53, a comparison judgment data generation means 54, and a random number generation means 55. Then, when the management control instruction determination means 48 selects the execution of the primary temporary address generation process, the instruction signal is output to the address generation means 53. In the address generation means 53, one of a predetermined number of numerical values is selected as the primary temporary address based on the random numbers passed from the random number generation means 55. The selected primary temporary address is handed over to the profile data storage means 44 and stored. The primary temporary address stored in the profile data storage means 44 is delivered to the management control data extraction means 42 in response to a request from the management control data extraction means 42.

<Primary temporary address confirmation process>
When the management control instruction determination means 48 selects the execution of the primary temporary address confirmation process, the instruction signal is output to the comparison determination data generation means 54. In the comparison determination data generating means 54, one of a predetermined number of numerical values is selected as a primal number based on the random numbers passed from the random number generating means 55. Further, the comparison / judgment data generation means 54 generates comparison / collation data in which the elements are converted according to a predetermined rule. Then, the element number and the comparison / collation data are delivered to the management / monitoring data transmission means 45.

<Secondary temporary address confirmation process>
When execution of the secondary temporary address determination process is selected in the management control instruction determination means 48, the data of the secondary temporary address transmitted to the own station is output to the profile data storage means 44. In the profile data storage means 44 that receives this, the delivered data is stored as a secondary temporary address. The secondary temporary address stored in the profile data storage means 44 is delivered to the management control data extraction means 42 in response to a request from the management control data extraction means 42.

<Profile data output processing>
When execution of the profile data output process is selected in the management control instruction determination means 48, a signal instructing the output of the profile data is output to the profile data storage means 44. Upon receiving this, the profile data storage means 44 delivers the profile data to the management monitoring data transmission means 45.

<Positive address confirmation process>
When the execution of the positive address determination process is selected by the management control instruction determination means 48, the data of the positive address transmitted to the own station is output to the profile data storage means 44. In the profile data storage means 44 that receives this, the delivered data is stored as a positive address. The positive address is valid by restarting the system or an alternative means after the address setting process is completed. Then, after the positive address is activated, the positive address is delivered to each of the requested means from the profile data storage means 44 in response to the request from the management control data extraction means 42 and the address extraction means 43.

<Unique identifier confirmation process>
When the management control instruction determination means 48 selects the execution of the unique identifier setting process, the profile data storage means 44 outputs the data of the unique identifier transmitted to the own station. In the profile data storage means 44 that receives this, the delivered data is stored as a unique identifier. The unique identifier is valid by restarting the system or an alternative means after the address setting process is completed. Then, after the unique identifier is activated, the unique identifier is delivered from the profile data storage means 44 to the management control data extraction means 42 in response to the request from the management control data extraction means 42.

In this embodiment, the random number generation means 55 is always operated, but it may be operated by the instruction signal output from the management control instruction determination means 48. In addition, the random number generation algorithm may be the one that is most suitable for the usage situation.

The management control instruction determination means 48 also sends data according to the purpose of management control to the management monitoring data transmission means 45 when some response is requested from the master station 2 in the normal state after the address setting is completed. hand over.

<Configuration of output slave station>
As shown in FIG. 5, the output slave station 5 includes a transmission / reception means 41, a management control data extraction means 42, an address extraction means 43, a profile data storage means 44, a management monitoring data transmission means 45, and a management control instruction determination means 48. A slave station output unit 50 having an address setting processing means 49, an IO control data extraction means 56, and an output means 57 is provided.

Like the input slave station 4, the output slave station 5 also includes an MCU which is a microcomputer control unit as an internal circuit, and this MCU functions as a slave station output unit 50. As with the MCU of the input slave station 4, the calculations and storage required for the processing of the output slave station 5 are executed using the CPU, RAM, and ROM included in the MCU.

The operations and storage required for the processing are executed using the CPU, RAM, and ROM provided in the MCU, but the CPU, RAM, and ROM in each processing of the above-mentioned means constituting the slave station output unit 50 are used. The relationship between the above will be omitted from the illustration for convenience of explanation. Further, in FIG. 5, substantially the same parts as the input slave station 4 are designated by the same reference numerals, and the description thereof will be simplified or omitted.

The address extraction means 43 of the output slave station 5 passes the timing signal for extracting the IO control data to the IO control data extraction means 56 during the period of the own station area.

The IO control data extraction means 56 is transmitted from the timing signal delivered from the address extraction means 43 and the transmission signal handed over from the transmission reception means 41 to its own station address (positive address) stored in the profile data storage means 44. The IO control data value is extracted and passed to the output means 57.

The output means 57 outputs information based on the control data delivered from the address extraction means 43 to the output unit 8, and operates or stops the output unit 8.

<I / O slave station configuration>
Both the input unit 7 and the output unit 8 that are in a corresponding relationship are connected to the input / output slave station 6. Like the input slave station 4 and the output slave station 5, the input / output slave station 6 also has an MCU which is a microcomputer control unit as an internal circuit, and this MCU functions as a slave station input / output unit. ing. Then, as with the MCU of the input slave station 4 and the MCU of the output slave station 5, the calculations and storage required for the processing of the input / output slave station 6 are executed using the CPU, RAM, and ROM provided in the MCU. It has become a thing.

The operations and storage required for the processing are executed using the CPU, RAM, and ROM provided in the MCU, but the CPU, RAM, and ROM in each processing of the above-mentioned means constituting the slave station input / output unit are used. The relationship between the above will be omitted from the illustration for convenience of explanation. Further, the slave station input / output unit includes both the slave station input unit 40 and the slave station output unit 50, and each of these configurations is substantially the same as the slave station input unit 40 and the slave station output unit 50. Since they are the same, the illustration and description thereof will be omitted.

Next, the address setting method of the slave stations 4, 5 and 6 will be described with reference to FIG.
First, the master station 2 instructs all the slave stations 4, 5, and 6 to set the primary temporary address by a broadcast command. In the slave stations 4, 5 and 6 that receive this, the above-mentioned primary temporary address generation process is executed, and one selected from a predetermined number of numerical values based on a random number is set as the primary temporary address. (Step 1 in FIG. 8)

Next, the master station 2 sequentially designates all of a predetermined number of numerical values that can be set as the primary temporary address by using the management control data area. (Step 2 in FIG. 8) In the slave stations 4, 5 and 6 that receive this, if the primary temporary address set in the own station matches the numerical value specified in the master station 2, the primary temporary address described above Confirmation processing is executed. Then, the element number and the comparison / collation data are output to the management / monitoring data area. (Step 3 in FIG. 8)

In the master station 2 that has received the element number and the comparison collation data, the comparison determination unit 27 converts the element number in the same manner as the slave stations 4, 5 and 6 to generate the comparison collation data, and the slave stations 4, 5 and 6 Compare and collate with the comparison and collation data received from 6. Then, when both data match, data indicating that there is no duplication is passed from the comparison determination unit 27 to the management data unit 22. (Step 3 in FIG. 8)

If there is duplication, different elements and different comparison collation data are transmitted from multiple slave stations 4, 5 and 6, and the element number and comparison collation data received by the master station 2 are superposed. Become. Therefore, a predetermined rule is not established for the element number received by the master station 2 and the comparison collation data, and the comparison collation data generated by the comparison determination unit 27 of the master station 2 is the slave stations 4, 5, and 6. Does not match the comparison collation data received from. That is, if both data do not match, it means that they are duplicated. Therefore, when the two data do not match, the data indicating that there is duplication is passed from the comparison determination unit 27 to the management data unit 22. (Step 3 in FIG. 8)

If a numerical value that is not set as the primary temporary address is specified in any of the slave stations 4, 5 and 6, the original number is not transmitted from any of the slave stations 4, 5 and 6. Therefore, in this embodiment, when the element number received by the master station 2 is 0, it is determined that the slave stations 4, 5 and 6 whose numerical value is set as the temporary temporary address do not exist, and the comparison collation is not executed. It is supposed to be.

However, there is no limitation on the method for determining the presence / absence of the slave stations 4, 5 and 6 set as the primary temporary address, and other methods may be adopted depending on the usage situation. For example, the management control data extraction means 42 of the slave stations 4, 5 and 6 sends the data that becomes the survival confirmation monitoring data Ri to the management monitoring data transmission means 45 even when the primary temporary address determined by the own station is specified. The master station 2 may determine the existence or nonexistence of the slave stations 4, 5, and 6 in which the primary temporary address is set based on the survival confirmation monitoring data Ri.

If there is no duplication, the management data unit 22 of the master station 2 has an eigenvalue indicating that the primary temporary address has been set for the first time, for example, a numerical value 1 (001 for 3-bit analog display). Is added to the secondary temporary address table as a fixed secondary temporary address. (Step 4 in FIG. 8)

When the determination of the presence or absence of duplication is completed for all the predetermined number of numerical values that can be set as the primary temporary address, the secondary temporary address added to the secondary temporary address table is transmitted to the unique primary temporary address. Upon receiving this, the slave stations 4, 5 and 6 execute the above-mentioned temporary address determination process when the primary temporary address set in the own station matches the numerical value specified in the master station 2. (Step 4 in FIG. 8)

In addition, the duplicate primary temporary address is instructed to reset the primary temporary address. In response to this, when the primary temporary address set in the own station matches the numerical value specified in the master station 2, the slave stations 4, 5 and 6 execute the above-mentioned primary temporary address generation process and generate random numbers. One selected from a predetermined number of numerical values based on is reset as a primary temporary address. (Step 5 in FIG. 8)

If the primary temporary address is reset in the slave stations 4, 5 and 6 that have duplicates in the previously set primary temporary address, the reset primary temporary address will be checked for duplication by the same procedure as above. It is judged. Then, the secondary temporary addresses are fixed for the slave stations 4, 5 and 6 in which the primary temporary addresses without duplication are set, and the slave stations 4, 5 and 6 in which the primary temporary addresses with duplication are set are determined. Furthermore, the primary temporary address is reset, and the presence or absence of duplication is determined.

The eigenvalues used to determine the secondary temporary address are different from the eigenvalues used to determine the secondary temporary address. For example, the numerical value 2 (010 of 3-bit analog display) is adopted when the confirmation is made by the second primary temporary address setting, and the numerical value 3 (011 of the 3-bit analog display) is adopted when the confirmation is made based on the generation of the third random number. ..

The processing of primary temporary address setting, determination of presence / absence of address duplication, and determination of secondary temporary address is repeated until no duplication of primary temporary address setting is confirmed. Then, when it is determined that the primary temporary addresses set in duplicate have disappeared, the secondary temporary addresses are set for all the slave stations 4, 5 and 6 by confirming the secondary temporary addresses at that time. It will be in a state of being. (Step 6 in FIG. 8)

When the secondary temporary addresses are set for all the slave stations 4, 5 and 6, the master station 2 sequentially specifies all the secondary temporary addresses and all the slave stations 4, 5 and 6 respectively. Collect profile data for. Then, a secondary temporary address table that summarizes the profile data in association with the secondary temporary address is completed (step 7 in FIG. 8).

When the secondary temporary address table is completed, the number of occupied points (occupied) for all slave stations 4, 5 and 6 based on the slave station information table and the secondary temporary address table stored in the management data unit 22 of the master station 2 A positive address that reflects the address) is assigned. (Step 8 in FIG. 8)

The positive addresses assigned to all the slave stations 4, 5 and 6 are set from the master station 2 to all the slave stations 4, 5 and 6 via transmission using the secondary temporary address. In this embodiment, the management control data area is used, the secondary temporary address is sequentially specified, and the positive address associated with the designated secondary temporary address is transmitted. Upon receiving this, the slave stations 4, 5 and 6 execute the above-mentioned positive address determination process when the secondary temporary address set in the own station matches the numerical value specified in the master station 2. Then, positive addresses are set in the slave stations 4, 5 and 6. (Step 9 in FIG. 8)

After the positive addresses are set for all the slave stations 4, 5 and 6, the unique identifier is subsequently set. Like the primary address, the unique identifier is also set from the master station 2 to all the slave stations 4, 5 and 6 via transmission using the secondary temporary address. In this embodiment, the management control data area is used, the secondary temporary address is sequentially specified, and the unique identifier associated with the designated secondary temporary address is transmitted. Upon receiving this, the slave stations 4, 5 and 6 execute the above-mentioned unique identifier determination process when the secondary temporary address set in the own station matches the numerical value specified in the master station 2. Then, unique identifiers are set in the slave stations 4, 5 and 6. (Step 10 in FIG. 8)

The positive addresses and unique identifiers set in all the slave stations 4, 5 and 6 are activated by the set value activation process. (Step 11 of FIG. 8) In this embodiment, the positive address and the unique identifier are activated by restarting the system after the address setting process (steps 1 to 10 of FIG. 8) is completed. .. However, there is no limitation on the activation means, and it can be appropriately decided according to the usage situation and the design situation. For example, a broadcast command may be transmitted from the master station 2 to all the slave stations 4, 5, and 6.

In this embodiment, the allocation of the positive address is executed by the management data unit 22 of the master station 2, but there is no limitation on the procedure for allocating the positive address. For example, if the slave station information table does not exist, the positive address may be assigned based on the secondary temporary address table while considering the system design.

Further, the primary temporary address may be set by adopting another method that is not based on a random number, as long as one of a predetermined number of numerical values is set.

The positive address is duplicated in the output slave station 5 connected to each of the plurality of output units 8 to be operated at the same time. In this embodiment, the positive addresses are duplicated in the two output slave stations shown in FIG. Then, the following effects can be obtained by setting duplicate positive addresses.

<Increase in the number of connection points>
When the positive address is set to each output slave station 5, different data areas in the IO data area are allocated to each output slave station 5. In the example shown in FIG. 9B, the data area at addresses 1 to 4 is allocated to one output slave station 5, and the data area at addresses 5 to 8 is allocated to the other output slave station 5. Then, in each output slave station 5, the start address address of the allocated data area is set to the address address 1 and the address address 5 as the positive addresses of the own station in the example shown in FIG. 9B, and the positive addresses thereof. The IO control data in the data area starting with is extracted from the transmission signal.

On the other hand, when the positive address is duplicated in the output slave station 5 connected to each of the plurality of output units 8 to be operated at the same time, the same data area in the IO data area is allocated to both output slave stations 5. In the example shown in FIG. 9A, the data areas at addresses 1 to 4 are allocated to both output slave stations 5. Then, the same start address address of the allocated data area is set in both output slave stations 5, and in the example shown in FIG. 9A, the address address 1 is set as the positive address of the own station, and the data starts from the positive address. The IO control data of the area is extracted from the transmission signal. Therefore, the data area at addresses 5 to 8 can be allocated to other slave stations 4, 5, and 6. That is, the number of connection points to the transmission line can be increased.

<Prevention of operation time delay>
When different data areas in the IO data area are allocated to each output slave station 5, a time difference occurs in the operation of the output unit 8 due to the difference in the timing of transmission from the master station 2. In the example shown in FIG. 9B, there is a time lag between the output of the data in the data area at address 4 and the output of the data in the data area at address 8. On the other hand, when the same data area in the IO data area is allocated to each output slave station 5, it is possible to prevent a time difference in the operation of the output unit 8. In the example shown in FIG. 9A, when the data in the data area at address 4 is output, both output units 8 operate. For example, when the output unit 8 is a lighting device and a large number of lighting devices are installed in one room, all the lighting devices in the room can be turned on at the same time.

The positive address may be duplicated in a plurality of input slave stations 4. For example, if the input unit 7 is a sensor, it is possible to execute wired OR by a plurality of sensors.

In this embodiment, when the master station 2 exchanges data with the slave stations 4, 5, and 6 using the management data area, the slave stations 4, 5, and 6 are designated as the second management control data IDXo. The identifier is output from the master station 2. Then, as described above, the survival confirmation monitoring data Ri is output from the slave stations 4, 5 and 6 to which the unique identifier set in the own station is specified. Therefore, it is possible to confirm the survival of the slave stations 4, 5 and 6 each time the master station 2 exchanges data with the slave stations 4, 5 and 6 using the management data area.

Further, in this embodiment, one unique identifier is set for each of the slave stations 4, 5, and 6, but the number is not limited, and a plurality of unique identifiers may be set within a range that does not overlap. For example, by setting four different unique identifiers in the input slave station 4 having four input terminals and corresponding the unique identifiers to each input terminal, it is possible to confirm the survival of each input terminal. It becomes.

Further, in this embodiment, the unique identifier is set in each of the slave stations 4, 5 and 6 by storing an arbitrarily determined numerical value in the management data unit 22 of the master station 2 and using the secondary temporary address. However, there is no limit as long as it is set within a range that does not overlap. The secondary temporary address set in each of the slave stations 4, 5 and 6 may be used as a unique identifier.

The unique identifier is indicated by a number in consideration of the speed and capacity of transmission performed between the master station 2 and the slave stations 4, 5, and 6, but in repair and maintenance work, a person determines the model and installation location of the device. It is difficult to identify from the contents. Therefore, in consideration of the efficiency of work by humans, labels expressing the model and installation location of the device with contents that can be recalled by humans are set in each of the slave stations 4, 5 and 6 separately from the unique identifier. May be good.

For example, if the output unit 8 is a lighting device as described above, the letter O indicating that it is an output device and the letter L indicating that it is a lighting device are combined with the serial number of the lighting device, such as OL1 and OL2. By setting the label, it is possible for a person to easily identify the device, and it is expected that the efficiency of work by the person will be improved.

1 Control unit 2 Master station 4 Input slave station 5 Output slave station 6 Input / output slave station 7 Input unit 8 Output unit 9 Input / output unit 11 Management judgment means 12 Input / output unit 21 Output data unit 22 Management data unit 23 Timing generation unit 24 Master station output unit 25 Master station input unit 26 Input data unit 27 Comparison judgment unit 29 Storage means 31 Oscillation circuit (OSC)
32 Timing generation means 33 Control data generation means 34 Line driver 35 Monitoring signal detection means 36 Monitoring data extraction means 40 Slave station input unit 41 Transmission / reception means 42 Management control data extraction means 43 Address extraction means 44 Profile data storage means 45 Management monitoring data Transmission means 46 Input means 47 IO monitoring data transmission means 48 Management control instruction judgment means 49 Address setting processing means 50 Slave station output unit 51 Slave station line receiver 52 Slave station line driver 53 Address generation means 54 Comparison judgment data generation means 55 Random generation Means 56 IO control data extraction means 57 Output means

Claims (5)

It is equipped with a plurality of slave stations that send and receive data by a transmission synchronization method via a transmission line common to the control side device, and IO control data for the slave station and IO monitoring superimposed by the slave station in the transmission procedure. In a control / monitoring signal transmission system provided with a management data area different from the IO data area composed of data.
One of the predetermined number of numerical values is set as the primary temporary address for each slave station, and the primary temporary address is set.
An inquiry step in which all numerical values that may be set as the primary temporary address are sequentially specified from the control side device via the management data area, and an inquiry to the slave station is executed.
A duplication determination step in which the presence or absence of duplication of the primary temporary address is determined based on a reply to the inquiry from the slave station via the management data area where the specified numerical value matches the primary temporary address.
The primary temporary address determined to be unique from the control side device is sequentially designated via the management data area, and a predetermined eigenvalue is added to the primary temporary address designated via the management data area. The secondary temporary address is transmitted through the management data area together with the designated primary temporary address, and the slave station whose specified primary temporary address matches the primary temporary address set by the own station. In the secondary temporary address setting step in which the secondary temporary address transmitted together with the designated primary temporary address is set,
From the control side device, the primary temporary address determined to have duplication is sequentially designated via the management data area, and the primary temporary address setting command is sequentially designated via the management data area together with the designated primary temporary address. In the slave station where the specified primary temporary address matches the primary temporary address set by the own station, one of a predetermined number of numerical values is set as the primary temporary address. Has a setting process
The inquiry step, the duplication determination step, the secondary temporary address setting step, and the primary temporary address resetting step are repeated until there is no duplication of the primary temporary address.
The eigenvalues constituting the secondary temporary address are set to different values each time the primary temporary address is reset.
After the secondary temporary address different for each slave station is set, the positive address indicating the start position of the data area in the IO data area assigned to each of the slave stations and the positive address indicating the start position in the IO data area and each slave station. Different unique identifiers are set for each of the slave stations using the secondary temporary address via the management data area.
After the unique identifier is set for each slave station, the unique identifier is specified in the management data area, and the designated unique identifier matches the unique identifier set in the own station from the slave station. A slave station survival confirmation method characterized by detecting the presence or absence of a response.
The slave station survival confirmation method according to claim 1, wherein the secondary temporary address is the unique identifier. The slave station survival confirmation method according to claim 1, wherein a plurality of different unique identifiers corresponding to a plurality of IO connection points of the slave station are set. The slave station survival confirmation method according to claim 1, 2 or 3, wherein a label different from the unique identifier is set for each slave station. The slave station survival confirmation method according to claim 4, wherein the label contains a character string.

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