JP7293045B2 - Slave station identification method for control/monitoring signal transmission system - Google Patents

Description

According to the present invention, signal lines between a master station provided on the control side and a plurality of slave stations provided on the controlled side are reduced in wiring, connected by a common transmission line, and synchronized by a transmission clock. The present invention relates to a system for specifying a target slave station among a plurality of slave stations installed away from a control-side device in a control/monitoring signal transmission system that transmits data by a transmission synchronization method.

2. Description of the Related Art In a control system that includes a control unit, a plurality of output units and input units, or a plurality of controlled devices, so-called wiring saving, which reduces the number of wires, is widely practiced. As a general method for reducing wiring, parallel signals and serial signals are used instead of parallel connections in which signal lines extending from a plurality of output units and input units or from controlled devices are directly connected to a control unit. A master station equipped with a conversion function and multiple slave stations are connected to a control unit and multiple output units and input units, or to multiple controlled devices, respectively, so that common data can be exchanged between the master station and multiple slave stations. A method of transmitting and receiving data in the form of a serial signal via a signal line is widely used.

However, in a system in which a large number of slave stations are connected and the wiring is reduced, depending on the content of the data transmitted from the slave station, it is necessary to confirm that the transmission and reception of data with the slave station are normal. It may not be possible to confirm that the controller is doing so. For example, if only data indicating that a sensor has been detected is transmitted, and no data is transmitted when there is no sensor detection, the reason why data is not received is that there is no sensor detection. It was not possible to determine on the control unit side whether this was due to the fact that the slave station was not alive, and it was not possible to confirm that the slave station was alive. In such a case, it is necessary to check each slave station that is far away from the control unit, which poses the problem of requiring a lot of man-hours and time.

Therefore, the present applicant has disclosed in Japanese Patent No. 4933686 a transmission line disconnection detection that can detect a disconnection of a transmission line, which is one of the causes of problems in data transmission and reception with slave stations, on the control unit side. I am proposing a method. In this transmission line disconnection detection method, the management control data (data for comparison) output from the master station in the management data area provided in the transmission signal designates the address of an arbitrary slave station and the address of the own station. From the slave station, own station address data (individual specific data) is output to the management data area as management monitoring data, and the control side judges whether or not there is a disconnection based on the result of comparison between the individual specific data and comparison data.

In addition to disconnection of the transmission line, failure of the slave station and faulty power supply can also be cited as causes of problems in sending and receiving data to and from the slave station. It becomes impossible to output the individual specific data for the designation of the station address. Therefore, according to the transmission line disconnection detection method, it is possible to confirm the survival of the slave station.

Japanese Patent No. 4933686

A slave station used for wire-saving transmission signals generally does not have a device-specific identifier such as an Ethernet MAC address. Therefore, in the method of exchanging data by serial signals between the master station and multiple slave stations via a common data signal line, each of the multiple slave stations is assigned a data area for the transmission signal and assigned to its own station. A numerical address for obtaining the timing of the data area is set in each child station. Each of the plurality of child stations exchanges data with the parent station in the data area assigned to itself, thereby preventing collisions in transmission and reception of the plurality of child stations.

However, the numerical address does not indicate the characteristics of the child station, such as the position where the child station is installed, the input/output type, or the application. Therefore, even if the address set to the malfunctioning slave station is found as a result of confirming the survival of the slave station, the slave station cannot be specified. In addition, in order to take countermeasures such as repair or replacement, it is necessary to identify the target child station at the site where the child station is installed, and it takes time and effort to take countermeasures.

In addition, it is not limited to when a problem occurs in a slave station, and even when performing work on a normally operating slave station, for example, when performing inspections or changing settings, the slave station to which the work target address is assigned has to be specified at the site where the slave station is installed, which requires time and effort.

Furthermore, in order to build a system using a control/monitoring signal transmission system that transmits data by a transmission synchronous method, work for system construction is necessary for exchanging data with the devices that make up the system. (wiring, etc.), the task of allocating numerical addresses to devices, which was originally unnecessary, became necessary. In the work of assigning this address, it is necessary to make calculations and settings that are conscious of the addresses expressed by numerical values that are unrelated to the characteristics of the slave stations. was extremely difficult to detect and correct.

Therefore, the present invention provides a slave station identification method that can easily identify a slave station without being conscious of addresses in numerical expressions in manual work related to a control/monitoring signal transmission system that transmits data by a transmission synchronization method. intended to provide

In the slave station specifying system according to the present invention, a plurality of slave stations are provided for transmitting and receiving data by a transmission synchronization method via a transmission line common to a control side device, and IO control data for the slave stations is included in the transmission procedure. and IO monitoring data superimposed by the child station, in a control/monitoring signal transmission system provided with a management data area different from the IO data area, one of the predetermined number of numerical values for each of the child stations is A primary temporary address is set, 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 child station is executed.

In the duplication determination step, it is determined whether or not there is duplication of the primary temporary address based on a reply via the management data area from the child station whose designated numerical value matches the primary temporary address.

In the secondary temporary address setting step, a secondary temporary address is generated by adding a predetermined unique value to the primary temporary address without duplication, and the slave station to which the primary temporary address constituting the secondary temporary address is set. is set to the secondary temporary address through the management data area.

In the primary temporary address resetting step, the primary temporary address is reset to the child station to which the overlapping primary temporary address is set.

A unique value constituting the secondary temporary address is set to a different value each time the primary temporary address is reset, and a different secondary temporary address is set for each child station.

After the secondary temporary address which is different for each child station is set, the secondary temporary address is sequentially designated via the management data area, and the designated secondary temporary address and the set for the own station are selected. From the slave station with the matching secondary temporary address, a label preset in the slave station associated with the slave station specifying information that can specify the slave station is transmitted to the control-side device via the management data area. be.

Further, after the secondary temporary address different for each of the child stations is set, the correct address in numerical expression indicating the starting position in the IO data area of the data area in the IO data area assigned to each of the child stations is: It is set in each of the child stations using the secondary temporary address through the management data area and associated with the label.

The child station identification information is any one of location information that identifies the location where the child station is installed, an input/output type of the child station, and a purpose of use of the child station, or a combination of two or more of them. good too.

After setting the secondary temporary address that is different for each of the child stations, a unique identifier that is different for each of the child stations is set to each of the child stations using the secondary temporary address via the management data area. , the label may be associated with the unique identifier.

In the slave station, a blank label indicating that no arbitrary data has been input is set as an initial state, and when the label transmitted to the control-side device is the blank label, the slave station that transmitted the blank label Stations may be re-labeled.

According to the slave station specifying method according to the present invention, the label associated with the slave station specifying information capable of specifying the slave station and preset to the slave station is aggregated in the control device. A child station can be specified. Therefore, in the work involving human intervention, the child station can be easily specified without being conscious of the address in numerical expression.

In addition, by associating the label with the correct address of the numerical expression indicating the start position of the data area in the IO data area in the IO data area assigned to each child station, it can be expressed by a numerical value that is irrelevant to the characteristics of the child station. Calculations and settings that are conscious of addresses are unnecessary. That is, in the work involving human intervention, the child station can be easily identified without being conscious of the address in numerical expression.

1 is a system configuration diagram showing a schematic configuration of a control/monitoring signal transmission system to which a child station position specifying method according to the present invention is applied; FIG. 2 is a system configuration diagram of a master station; FIG. 2 is a system configuration diagram of an input slave station; FIG. 2 is a system configuration diagram of address setting means; FIG. FIG. 3 is a system configuration diagram of an output slave station; 4 is a schematic diagram of a transmission system between a master station and slave stations; FIG. It is a time chart figure of a transmission clock signal. FIG. 10 is a diagram showing the flow of processing until labels are aggregated in a control-side device;

An embodiment of the slave station identification method according to the present invention will be described with reference to FIGS. 1 to 8. FIG.
FIG. 1 is a configuration diagram of a control/supervisory signal transmission system to which a slave station specifying method according to the present invention is applied. This control/monitoring signal transmission system is for centrally controlling a large number of devices arranged in a facility such as a factory in a control section. As shown in FIG. 1, there are a master station 2 connected to a control unit 1 and common data signal lines DP and DN (hereinafter referred to as transmission lines), and a master station 2 which is arranged in a facility on the controlled side and connected to the transmission lines. It consists of a plurality of input slave stations 4 , output slave stations 5 and input/output slave stations 6 . For convenience of illustration, FIG. 1 shows one input slave station, one output slave station, and one input/output slave station. 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.

For example, a reed switch, a microswitch, a push button switch, a photoelectric switch, and various other sensors can be cited as examples of the input unit 7, but the present invention is not limited to these.

For example, actuators, (stepping) motors, solenoids, electromagnetic valves, relays, thyristors, and lamps can be cited as equivalents to the output unit 8, but are not limited to these.

The input/output unit 9 is a device having the functions of both the input unit 7 and the output unit 8 . For example, devices such as temperature controllers, timers, counters, etc., which have 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 . Also, 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 and an input/output unit 12 having arithmetic processing functions. The management judgment means 11 receives data from the master station 2 via the input/output unit 12 and performs necessary arithmetic processing based on the internally stored program.

<Configuration of master station>
As shown in FIG. 3, the master station 2 includes an output data section 21, a management data section 22, a timing generation section 23, a master station output section 24, a master station input section 25, an input data section 26, and a comparison determination section 27. . Then, it is connected to a transmission line and superimposes a control signal, which is a series of pulse-like signals, on the transmission line. When all of the station 5 and the input/output slave station 6 are targeted, the monitor data extracted from the monitor signal superimposed on the transmission line from the slave stations 4, 5, and 6 is sent to the input/output unit of the control unit 1. 12.

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

The management data unit 22 includes 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 necessary for instructing the slave station in the later-described management control data area is delivered to the master station output unit 24 as serial data.

The child station information table cannot be obtained by using the positive address of numerical expression indicating the starting position in the IO data area of the data area in the IO data area assigned to each of the child stations 4, 5, and 6, and the IO data area. It contains unique identifiers for designating child stations 4, 5, and 6 that output information on the child station side to transmission lines.

The correct addresses and unique identifiers of the slave stations 4, 5 and 6 are secondary temporary addresses obtained by adding a predetermined unique value to the primary temporary addresses set based on random numbers, as will be described later. After being set to 6, the secondary temporary address is used and set to all slave stations 4, 5 and 6. FIG. In the management data unit 22, a secondary temporary address table is created and stored according to the procedure described later.

The timing generator 23 is composed of an oscillator circuit (OSC) 31 and timing generator 32. Based on the oscillator circuit (OSC) 31, the timing generator 32 generates a timing clock for this system, which is output to the master station output unit 24 and the master station output unit 24. It is handed over to the station input section 25 .

The master station output section 24 is composed of a control data generating means 33 and a line driver 34 . Based on the data received from the output data section 21 and the timing clock received from the timing generation section 23, the control data generation means 33 superimposes a transmission signal as a series of pulse signals on the transmission line via the line driver .

As shown in FIG. 6, the transmission procedure is one frame cycle between the start signal ST of the transmission signal and the next start signal ST, followed by an IO data area and a management data area. Configured. 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, a pulse signal that constitutes a transmission signal is composed of a power supply voltage area with a power supply voltage level higher than the threshold Vst and a low potential area with a potential level lower than the threshold Vst.

The power supply voltage area corresponds to the transmission clock signal, which is +24V in this embodiment. There is no limit to the power supply voltage level, and it can be determined as appropriate according to the usage environment and usage conditions. It may be a negative power supply.

Also, 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 there is no restriction on the order, and these orders may be reversed. The same applies when the power supply voltage level is the negative power supply. Note that the low potential area in this embodiment is a high potential area with respect to the power supply voltage area in the case of a negative power supply.

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 this control data area corresponds to the upper stage 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 the management control data area.

In this embodiment, when one period of the pulse signal forming the transmission signal is t0, the pulse width (3/4) t0 of the pulse signal forming the transmission signal represents logic data "1", and the pulse width (1 /4) t0 represents 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 determined as appropriate.

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 this monitoring data area corresponds to the lower stage of the IO data area and the management data area in FIG. The monitoring data area in the management data area is hereinafter referred to as a management monitoring data area.

In this embodiment, a current signal less than 10 mA represents logic data "0" and a current signal greater than 10 mA represents logic data "1".

In the management control data area, the first management control data ISTo for instructing the slave stations 4, 5, 6 to request information, etc., and the unique identifier set for each of the slave stations 4, 5, 6 are stored. The designated second management control data IDXo is input from the master station 2 . 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 specified by the second management control data IDXo are stored. is entered. Further, in the management monitoring data area, survival confirmation monitoring data Ri is input from the slave stations 4, 5, and 6 whose unique identifier is designated by the second management control data IDXo.

The master station input unit 25 is composed of supervisory signal detection means 35 and supervisory data extraction means 36 . Supervisory signal detection means 35 detects supervisory signals superimposed on the transmission line from slave stations 4 , 6 , 7 .

The supervisory data extracting means 36 passes the corresponding data value to the input data section 26 based on the detection result of the supervisory signal by the supervisory signal detecting means 35 . In this embodiment, the logic data "1" is delivered to the input data section 26 when the supervisory signal is detected, and the logical data "0" is delivered when the supervisory signal is not detected.

In addition, the monitoring data extracting means 36 delivers the management monitoring data superimposed on the management monitoring data area to the comparing/determining section 27 at the time of address setting, which will be described later. Then, the comparison/determination unit 27 performs comparison/verification using the element number and data for comparison/verification, which will be described later, and transfers the determination result of match or mismatch to the management data unit 22 .

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

<Configuration of input slave station>
As shown in FIG. 3, the input slave station 4 includes transmission reception means 41, management control data extraction means 42, address extraction means 43, profile data storage means 44, management monitoring data transmission means 45, input means 46, IO monitoring data A slave station input unit 40 having transmission means 47 , management control instruction determination means 48 , address setting processing means 49 and communication means 58 is provided. It also has a child station line receiver 51 and a child station line driver 52 arranged between the child station input section 40 and the transmission line.

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

Calculations and storage required for processing are executed using the CPU, RAM, and ROM provided in this MCU. For the sake of convenience of explanation, the relationship between is omitted from the illustration.

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

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 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 (falling edge in this embodiment) at which the start signal ST indicating the beginning of the transmission clock signal ends. The timing at which this count value matches the self-station address (correct address) data set in the profile data storage means 44 is the timing at which the data area assigned to the self-station in the transmission signal starts (hereinafter referred to as "self-station region start timing”).

The address extracting means 43 that has obtained the local station area start timing enables the IO monitoring data transmitting means 47 during the period of the local station area.

The profile data storage means 44 stores profile data indicating device characteristics of the own station, such as input/output types and the number of occupied points (occupied addresses) in the control/monitoring data area. The profile data storage means 44 also stores primary temporary addresses, secondary temporary addresses, unique identifiers, and labels, which will be described later.

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

In this embodiment, the address setting processing means 49 transfers the comparison judgment data and its prime number in the primary temporary address confirmation processing described later. Also, in profile data transmission processing, which will be described later, the profile data of the own station is transferred from the profile data storage means 44 . Furthermore, when the unique identifier set in the own station is specified, the management control data extracting means 42 delivers the data to be the survival confirmation monitoring data Ri. In the normal state after the address setting is completed, when the master station 2 requests some kind of response, the management control instruction judging means 48 delivers data according to the purpose of management control.

The input means 46 passes the data based on the input from the input section 7 to the IO monitoring data transmission means 47 .

The IO monitor data transmission means 47 outputs the data handed over from the input means 46 to the transmission line via the slave station line driver 52 as a monitor signal when the address extraction means 43 validates the data. The supervisory signal is superimposed on the IO supervisory data area of the transmission procedure.

The management control instruction determination means 48 executes appropriate output processing based on the first management control data ISTo handed over 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 . Also, when executing the secondary temporary address determination processing, the correct address determination processing, and the unique identifier setting processing, the data addressed to the own station included in the first management control data ISTo is transferred to the profile data storage means 44 . Furthermore, when the profile data transmission process is to be executed, a signal instructing data transmission is output to the profile data storage means 44 .

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

<Primary temporary address confirmation process>
When execution of the temporary temporary address confirmation process is selected by the management control instruction determining means 48 , an instruction signal is output to the comparison determination data generating means 54 . Based on the random number delivered from the random number generating means 55, the comparison judgment data generating means 54 selects one of the predetermined number of numerical values as the original number. In addition, the comparison determination data generation means 54 generates data for comparison and collation by converting the primaries according to a predetermined rule. Then, the element and the comparison/collation data are handed over to the management/monitoring data transmitting means 45 .

<Secondary temporary address determination processing>
When the execution of the secondary temporary address determination process is selected by the management control instruction determination means 48 , the secondary temporary address data transmitted to the own station is output to the profile data storage means 44 . Upon receipt of this, the profile data storage means 44 stores the transferred data as a secondary temporary address. The secondary temporary address stored in the profile data storage means 44 is handed over 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 by the management control instruction determination means 48 , a signal instructing output of profile data is output to the profile data storage means 44 . The profile data and label are passed to the management/monitoring data transmission means 45 from the profile data storage means 44 which receives this.

<Correct Address Confirmation Processing>
When the management control instruction determination means 48 selects execution of the correct address determination process, the correct address data sent to the own station is output to the profile data storage means 44 . Upon receipt of this, the profile data storage means 44 stores the delivered data as a normal address. It should be noted that the correct address is validated after the address setting process is completed by restarting the system or alternative means. After the correct address is validated, the correct address is transferred from the profile data storage means 44 to each requesting means in response to requests from the management control data extracting means 42 and the address extracting means 43 .

<Unique identifier confirmation processing>
When the execution of the unique identifier setting process is selected by the management control instruction determination means 48 , the unique identifier data transmitted to the own station is output to the profile data storage means 44 . Upon receipt of this, the profile data storage means 44 stores the transferred data as a unique identifier. It should be noted that the unique identifier is validated by restarting the system after the end of the address setting process or by alternative means. After the unique identifier is validated, the unique identifier is transferred from the profile data storage means 44 to the management control data extraction means 42 in response to a request from the management control data extraction means 42 .

In this embodiment, the random number generation means 55 always operates, but may be operated by an instruction signal output from the management control instruction determination means 48 . Also, the algorithm for generating random numbers should be the one that is most suitable for the situation of use.

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 kind of response is requested from the master station 2 in the normal state after the address setting is completed. hand over.

The communication means 58 is connected for communication with an external terminal 59 which is separate from the slave station 4 , and when the setting data is handed over from the external terminal 59 , it is handed over to the profile data storage means 44 . The profile data storage means 44 stores the data when the data is handed over from the communication means 58 .

When the external terminal 59 requests data delivery, the communication means 58 extracts the relevant data from the profile data storage means 44 and delivers it to the external terminal 59 . The data handed over from the communication means 58 to the external terminal 59 is displayed on the display section provided in the external terminal 59 .

In this embodiment, the label is set via these communication means 58 and external terminal 59 .

<Configuration of output slave station>
As shown in FIG. 5, the output slave station 5 includes transmission reception means 41, management control data extraction means 42, address extraction means 43, profile data storage means 44, management monitoring data transmission means 45, management control instruction determination means 48, A slave station output unit 50 having address setting processing means 49 , IO control data extraction means 56 , output means 57 and communication means 58 is provided.

Similarly to the input slave station 4, the output slave station 5 also has an MCU, which is a microcomputer control unit, as an internal circuit. Similar to the MCU of the input child station 4, the calculations and storage required in the processing of the output child station 5 are executed using the CPU, RAM and ROM of this MCU.

Calculations and storage required for processing are executed using the CPU, RAM, and ROM provided in this MCU. For the sake of convenience of explanation, the relationship between is omitted from the illustration. Further, in FIG. 5, the same reference numerals are assigned to substantially the same portions as those of the input slave station 4, and the description thereof will be simplified or omitted.

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

The IO control data extracting means 56 uses the timing signal handed over from the address extracting means 43 and the transmission signal handed over from the transmission receiving means 41 to transmit to the local station address (correct address) stored in the profile data storage means 44. It extracts the IO control data value obtained and delivers it to the output means 57 .

The output means 57 outputs information based on the control data handed over from the address extraction means 43 to the output section 8 to operate or stop the output section 8 .

<Configuration of input/output slave station>
The input/output slave station 6 is connected to both the input section 7 and the output section 8 which are in correspondence with each other. 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. Similar to the MCU of the input slave station 4 and the MCU of the output slave station 5, the calculations and storage required in the processing of the input/output slave station 6 are executed using the CPU, RAM, and ROM of this MCU. It is a thing.

Calculations and storage required for processing are executed using the CPU, RAM, and ROM provided in this MCU. For the sake of convenience of explanation, the relationship between is omitted from the illustration. Further, the slave station input/output unit includes both the slave station input unit 40 and the slave station output unit 50. These components are substantially the same as the slave station input unit 40 and the slave station output unit 50. Since they are the same, illustration and description thereof are omitted.

Next, referring to FIG. 8, a method of setting addresses of slave stations 4, 5 and 6 will be described.
First, the master station 2 instructs all slave stations 4, 5, and 6 to set a primary temporary address by a broadcast command. The slave stations 4, 5, and 6 that have received this execute the above-described primary temporary address generation processing, and set one selected from a predetermined number of numerical values based on a random number as the primary temporary address. (Step 1 in Figure 8)

Next, the master station 2 sequentially designates all the predetermined number of numerical values that can be set as the primary temporary address using the management control data area. (Step 2 in FIG. 8) When the slave stations 4, 5, and 6 that have received this request match the primary temporary address set in their own station with the numerical value specified in the master station 2, the primary temporary address A confirmation process is performed. Then, the element and the data for comparison and collation are output to the management monitoring data area. (Step 3 in Figure 8)

In the master station 2, which receives the original number and the data for comparison and collation, the comparison judgment unit 27 converts the original number in the same way as the child stations 4, 5, and 6 to generate the data for comparison and collation. The data for comparison and verification received from 6 is compared and verified. Then, when both data match, data indicating that there is no duplication is handed over from the comparison determination section 27 to the management data section 22 . (Step 3 in Figure 8)

If there is duplication, different numbers of elements and different data for comparison and verification are transmitted from a plurality of slave stations 4, 5, and 6, and the number of elements and data for comparison and verification received by the master station 2 are superimposed. Become. Therefore, a predetermined rule does not hold for the number of elements and the data for comparison and verification received by the master station 2. does not match the comparison data received from In other words, if both data do not match, it means that they are duplicated. Therefore, when the two data do not match, data indicating that there is duplication is handed over from the comparison/judgment section 27 to the management data section 22 . (Step 3 in Figure 8)

If any of the child stations 4, 5, and 6 designates a numerical value that is not set as the primary temporary address, none of the child stations 4, 5, and 6 transmits the original number. Therefore, in this embodiment, when the original 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 address do not exist, and no comparison is performed. It is assumed.

However, there are no restrictions on the method of determining whether or not there are child stations 4, 5, and 6 set as primary temporary addresses, and other methods may be adopted depending on the usage situation. For example, the management control data extracting means 42 of the slave stations 4, 5, and 6 send data to the management monitoring data transmission means 45 as the survival confirmation monitoring data Ri even when the primary temporary address determined by the slave station is specified. In this case, the master station 2 may determine whether or not the slave stations 4, 5, and 6 to which the primary temporary address is set exist based on the survival confirmation monitoring data Ri.

If there is no duplication, the management data section 22 of the master station 2 sets the primary temporary address to a unique value indicating that the primary temporary address is set for the first time, such as a numerical value of 1 (001 in 3-bit analog representation). is added to the secondary temporary address table as a fixed secondary temporary address. (Step 4 in Figure 8)

After determining whether or not there is overlap for all of 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 primary temporary address with no overlap. If the primary temporary address set in the slave station 4, 5, 6 that receives this matches the numerical value specified in the master station 2, the above-described temporary address confirmation processing is executed. (Step 4 in Figure 8)

In addition, an instruction to reset the primary temporary address is issued for the duplicate primary temporary address. If the primary temporary address set in the child station 4, 5, 6 that has received this matches the numerical value specified in the master station 2, the child station 4, 5, 6 executes the above-described primary temporary address generation processing and generates a random number One selected from a predetermined number of numerical values is reset as the primary temporary address. (Step 5 in Figure 8)

When the primary temporary addresses are reset in the slave stations 4, 5, and 6, which have duplicated the previously set primary temporary addresses, the presence or absence of duplication of the reset primary temporary addresses is checked in the same procedure as above. be judged. Then, the secondary temporary addresses are determined for the slave stations 4, 5, and 6 to which the primary temporary addresses without duplication are set, and the secondary temporary addresses are determined for the slave stations 4, 5, and 6 to which the duplicate primary temporary addresses are set. Furthermore, the primary temporary address is reset and the presence or absence of duplication is determined.

The unique value used to determine the secondary temporary address adopts a numerical value different from the unique value used to determine the secondary temporary address. For example, if it is determined by the second primary temporary address setting, the value 2 (3-bit analog display 010) is adopted, and if it is determined based on the third random number generation, the value 3 (3-bit analog display 011) is adopted. .

The processes of setting the primary temporary address, determining whether the address overlaps or not, and determining the secondary temporary address are repeated until the overlap of the primary temporary address setting is no longer confirmed. When it is determined that the redundantly set primary temporary addresses are eliminated, the secondary temporary addresses are set for all the child stations 4, 5 and 6 with the confirmation of the secondary temporary addresses at that time. state. (Step 6 in Figure 8)

When the secondary temporary addresses are set to all the child stations 4, 5, 6, the master station 2 sequentially designates all the secondary temporary addresses, and each of the child stations 4, 5, 6 Collect profile data and labels for Then, a secondary temporary address table is completed in which the profile data and labels are associated with the secondary temporary addresses (step 7 in FIG. 8).

When the secondary temporary address table is completed, all slave stations 4, 5 and 6 are occupied based on the slave station information table stored in the management data section 22 of the master station 2 and the profile data of the secondary temporary address table. A positive address reflecting the score (occupied address) is assigned. (Step 8 in Figure 8)

The primary addresses assigned to all child stations 4, 5 and 6 are set via transmission from the master station 2 to all child stations 4, 5 and 6 using secondary temporary addresses. In this embodiment, the management control data area is used to sequentially designate secondary temporary addresses, and the primary addresses associated with the designated secondary temporary addresses are transmitted. When the slave stations 4, 5, and 6 that have received this request match the secondary temporary address set in their own station with the numerical value specified in the master station 2, the above-described correct address determination processing is executed. Then, the slave stations 4, 5, and 6 are set with correct addresses. (Step 9 in Figure 8)

Once the correct addresses have been set for all the child stations 4, 5 and 6, then the unique identifiers are set. The unique identifier is also set via transmission from the master station 2 to all the slave stations 4, 5, 6 using the secondary temporary address in the same way as the primary address. In this embodiment, a management control data area is used to sequentially designate secondary temporary addresses, and unique identifiers associated with the designated secondary temporary addresses are transmitted. If the slave station 4, 5, or 6 that has received this has a secondary temporary address set to itself that matches the numerical value designated to the master station 2, the above-described unique identifier determination processing is executed. Then, unique identifiers are set for the child stations 4, 5, and 6. FIG. (Step 10 in FIG. 8)

The correct addresses and unique identifiers set for all slave stations 4, 5 and 6 are validated by the set value validation process. (Step 11 in FIG. 8) In this embodiment, the correct address and unique identifier are validated by restarting the system after the address setting process (steps 1 to 10 in FIG. 8) is completed. . However, there is no limit to the enabling means, and it can be determined as appropriate according to usage conditions and design conditions. For example, a broadcast command may be transmitted from the master station 2 to all slave stations 4, 5, and 6. FIG.

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

Further, although the correct addresses in this embodiment are assigned based on the profile data of the slave stations 4, 5, and 6, if programming is performed using labels, the correct addresses may be assigned based on the labels. good.

The primary temporary address may be set by adopting other methods not based on random numbers as long as one of the predetermined number of numerical values is set.

According to this embodiment, the slave stations 4, 5, and 6 can be specified using the labels aggregated in the master station 2, which is the controlling device.

In this embodiment, the slave stations 4, 5, and 6 are alive using survival confirmation monitoring data Ri transmitted from the slave stations 4, 5, and 6, which are designated with the unique identifiers set in their own stations. That is, the presence or absence of anomalies is detected, and if any are not alive, their unique identifiers are identified. Although the label is specified via the secondary temporary address associated with the unique identifier, the unique identifier and label may be directly associated.

The label is associated with child station identification information that can identify the child stations 4, 5, and 6. FIG. The slave station identification information includes location information that identifies the locations where the slave stations 4, 5, and 6 are installed, input/output types of the slave stations 4, 5, and 6, and usage purposes of the slave stations 4, 5, and 6. be done. Any of these information or a combination of two or more of them may be used. For example, OL1, OL2, etc. can be obtained by combining the letter O, which means an output device, as the input/output type, the L, which means a lighting device, as the purpose of use, and the number of the room where it is installed as the location information.

The label needs to be set before executing the address setting process, but there is no limitation on the setting method. As in this embodiment, without using the external terminal 59 separate from the slave stations 4, 5, and 6, the slave stations 4, 5, and 6 may be provided with input operators and set by them. Alternatively, the settings may be made at the site after the child stations 4, 5, and 6 are arranged, or may be set before being arranged at the site. In any case, it is preferable to display the content of the label in a visible state near the slave stations 4, 5 and 6 main bodies or the positions where the slave stations 4, 5 and 6 are arranged.

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 determination 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 determination unit 29 Storage means 31 Oscillation circuit (OSC)
32 timing generating means 33 control data generating means 34 line driver 35 supervisory signal detecting means 36 supervisory data extracting means 40 slave station input section 41 transmission receiving means 42 management control data extracting means 43 address extracting means 44 profile data storage means 45 supervisory monitoring data Transmission means 46 Input means 47 IO monitoring data transmission means 48 Management control instruction determination 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 number generation Means 56 IO control data extraction means 57 Output means 58 Communication means 59 External terminal

Claims (4)

Provided with a plurality of slave stations for transmitting and receiving data by a transmission synchronization method via a transmission line common to a control side device, and IO control data for the slave stations and IO monitoring superimposed by the slave stations in the transmission procedure In a control/monitoring signal transmission system provided with a management data area different from an IO data area composed of data,
one of a predetermined number of numerical values is set as a primary temporary address for each slave station;
an inquiry step of sequentially specifying all numerical values that may be set as the primary temporary address from the control-side device via the management data area and executing an inquiry to the child station;
a duplication determination step of determining whether or not there is duplication of the primary temporary address based on a reply to the inquiry from the child station whose designated numerical value matches the primary temporary address through the management data area;
A secondary temporary address is generated by adding a predetermined peculiar value to the primary temporary address without duplication, and the secondary temporary address, which constitutes the secondary temporary address, is set to the child station through the management data area. a secondary temporary address setting step in which a secondary temporary address is set;
repeating a primary temporary address resetting step of resetting the primary temporary address to the child station to which the overlapping primary temporary address is set until there is no overlap of the primary temporary address;
the unique value constituting the secondary temporary address is set to a different value each time the primary temporary address is reset;
After the secondary temporary addresses that are different for each of the child stations are set, the secondary temporary addresses are sequentially specified via the management data area, and the specified secondary temporary addresses and the two From the child station having the matching next temporary address, a label set in advance in the child station associated with the child station identification information capable of identifying the child station is transmitted to the control-side device via the management data area. After the secondary temporary address, which is different for each child station, is set, the correct address in numerical expression indicating the starting position in the IO data area of the data area in the IO data area assigned to each of the child stations is set in the management data. A slave station identification method characterized in that it is set in each of said slave stations using said secondary temporary address via an area and is associated with said label. The slave station identification information is any one of location information specifying the location where the slave station is installed, an input/output type of the slave station, and a purpose of use of the slave station, or a combination of two or more of them. The slave station identification method according to item 1. After setting the secondary temporary address that is different for each of the child stations, a unique identifier that is different for each of the child stations is set to each of the child stations using the secondary temporary address via the management data area. , and the label. In the slave station, a blank label indicating that no arbitrary data has been input is set as an initial state, and when the label transmitted to the control-side device is the blank label, the slave station that transmitted the blank label 4. A slave station identification method according to claim 1, 2 or 3, wherein the label is reset for the station.

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