JP2010282269A - Wireless network process monitoring system - Google Patents

Abstract

A wireless network process monitoring system that realizes simplification and high reliability of a system is provided.
A signal holding unit for storing past converter data and a sequence number to be updated every calculation cycle, RF transmitter / receiver data for wireless transmission, and waiting time for starting transmission are measured in signal converters 1a to 1d. The transmission cycle timer is provided, and the gateway 4 is provided with the collection data table 5 and the measurement data table 6 for updating the cycle of the converter data. The sequence number is monitored by the collection data table 5, and if the cycle is delayed, the sensor node is abnormal. The collected data storage determining unit is provided. In the host computer 3, an ID setting unit that sets the gateway wireless transmission channel, signal converter type, and node address in the gateway, and past conversion data collected by calculating the time of past converter data from the signal converter operation cycle A data collection alarm check unit that saves instrument data in measurement data recording files is provided to compensate for missing transducer data.
[Selection] Figure 1

Description

  The present invention relates to a wireless network process monitoring system that transmits data of a signal converter that converts signals from various sensors such as a thermocouple, a resistance temperature detector, and a transmitter to a host device by wireless transmission.

  Conventionally, a signal converter is called a process interface, which converts the temperature, humidity, pressure, flow rate, etc. measured by a sensor into a DC 4/20 mA unified signal, and then sends the measurement data and sensor status data to a host computer or controller by wire. (Hereinafter referred to as “converter data”) to monitor and control the process.

  Conventionally, measurement data such as temperature and humidity measured by a terminal called a sensor node is intermittently operated and sampled every measurement cycle of several tens of seconds to several minutes, and is processed in real time using wireless transmission. A network system (hereinafter referred to as a sensor network system) to be taken into a certain host computer has been studied. The sensor network system is a small sensor battery that collects measurement data and wirelessly transmits it with a host computer, etc., and a gateway that collects sensed data by wireless transmission and connects to a wired network such as the Internet. In addition, when there is a distance between the sensor node and the gateway, it is composed of three types of devices (referred to as nodes) of repeaters that perform relay transmission of wireless transmission.

  Conventionally, in a sensor network system, the hardware configuration of a sensor node and a gateway is shared, and a memory for sequentially storing commands to the sensor node as a table is provided in the base station (gateway) to reduce the power consumption of the sensor node. A system (Patent Document 1) and a series of commands from a host computer are scripted in a simple language, and the system operation flow is dynamically analyzed by analyzing and executing the script at each node gateway, router, and sensor node. Concerning transmission and reception of service information (signals) in a system that integrates a plurality of sensor networks with an information management server using ZigBee (registered trademark) as a communication standard for wireless transmission (Patent Document 2) ( Patent Document 3) is known. However, the above prior art has the following problems.

  When the signal converter is installed in the same switchboard (cubicle) as the host computer or controller, one wire is required for each sensor to connect by wire, requiring wiring space and wiring cost. There are disadvantages such as wiring errors.

  When wireless transmission of the sensor network system is used instead of the 4/20 mA unified signal, the gateway needs to process measurement data of a plurality of sensor nodes transmitted every measurement cycle as events asynchronously, and high real-time processing. Performance is required. For this reason, there is a limitation in the applicable hardware, and there is a disadvantage that event processing software capable of performing a plurality of asynchronous processes at the same time is required.

  In addition, wireless transmission is different from wired transmission of a 4/20 mA unified signal. For example, an error in data transmission may occur as specified in the IEEE 802.15.4 standard and above the specified reception level and the average packet loss rate is 1.0% or less. It occurs at a certain probability or less, and has a disadvantage that the loss rate is large for wired transmission by other digital signals. Furthermore, when data is collected by a polling method for each signal converter, the amount of packets increases and defects are increased. For these reasons, when measurement data loss is a problem, it is necessary to consider the transmission method in addition to the installation environment.

JP 2006-211439 A JP 2006-344017 A JP 2007-272399 A

  In the above conventional process monitoring system, a wired interface is used for the process interface. Further, the gateway of the sensor network system collects measurement data from the sensor nodes, but transmits them to the host computer as mere events without judging the retention and abnormality of the measurement data. In addition, data loss occurred when data transmission was made wireless.

  The present invention provides an RF transmission / reception unit in a signal converter and performs data transmission together with past converter data, receives converter data from a plurality of signal converters by wireless transmission with one command from the gateway, It is an object of the present invention to simplify the process monitoring system and to provide a highly reliable wireless network process monitoring system by holding converter data, updating the period, and determining abnormality in a gateway.

  The present invention provides a plurality of sensors for measuring a process state, a plurality of signal converters for collecting data and status data of each sensor to create a data packet including converter data, and data from the signal converters In a wireless network process monitoring system having a gateway for collecting packets by wireless transmission and sending converter data of the signal converter to a connected host computer, and a host computer for monitoring the process state by the converter data from the gateway The signal converter includes a transmission cycle timer for transmitting data packets to the gateway at a transmission interval proportional to an address when the gateway collects data.

  Further, in the wireless network process monitoring system, the gateway receives a collection data table storing converter data of a data packet of the signal converter and new converter data periodically updated from the converter data. A measurement data table to be stored is provided.

  In the wireless network process monitoring system, the signal converter includes a data holding unit that holds a sequence number that is updated every calculation cycle together with the calculator data, and the signal converter is a converter that is held in the data holding unit. A data packet including data and a sequence number is transmitted to the gateway.

  In the wireless network process monitoring system, the gateway includes a collected data storage determination unit that detects a communication status abnormality from a comparison between a sequence number and a converter data collection period.

  In the wireless network process monitoring system, the gateway includes a collected data storage determination unit that detects a communication status abnormality from a comparison between converter data and a converter type of a corresponding node address.

  Further, in the wireless network process monitoring system, the signal converter has a data holding unit for storing past converter data for each calculation cycle, and transmits new converter data together with past converter data to the gateway. The host computer includes a data collection alarm check unit having a measurement data recording file for calculating the time of past converter data from the calculation cycle of the signal converter and storing the collected past converter data, and wireless transmission It is characterized by preventing data loss due to data packet loss at the time.

  Further, in the wireless network process monitoring system, the signal converter has a data holding unit for storing converter data of four or more past data for each calculation cycle, and new converter data is transferred together with the past converter data to the gateway. It is characterized by transmitting to.

  The wireless network process monitoring system according to the present invention transmits the data packet including the converter data including the past converter data and the sequence number from each signal converter to the gateway at a transmission interval at the command of the gateway. Data collection packets from the computer are not required, and wireless transmission packets can be reduced and wireless data transmission procedures can be simplified.

  Further, the gateway stores the data packet data in the collection data table and the measurement data table, and can easily determine the abnormality of the data processing from the comparison of the data in the collection data table and the measurement data table.

  In addition, the host computer can easily process data by issuing commands such as data collection to the gateway and receiving the responses without being aware of the wireless network transmission procedure of the gateway and the signal converter.

  Furthermore, since the missing data at the time of wireless transmission of measurement data can be compensated for from past collected transducer data, high reliability of the wireless network process monitoring system can be realized.

It is a block diagram which shows the basic composition of the wireless network monitoring system of this invention. It is explanatory drawing which shows the data processing of each signal converter, a gateway, and a high-order computer. It is explanatory drawing which shows the time chart of data wireless transmission. It is explanatory drawing which shows the relationship between the data packet of data wireless transmission, and the collection data table. It is a flowchart which shows a data transmission procedure. It is explanatory drawing which shows storage of the accumulation | storage (past) data to a collection data table and a measurement data recording file.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[Basic configuration]
In FIG. 1, a plurality of signal converters 1a, 1b, 1c, and 1d measure temperature, pressure, flow rate, and level in various processes such as a power plant by sensors 2a, 2b, 2c, and 2d for each calculation cycle. Measurement data (temperature, pressure, flow rate, level, calculation data, etc.) and sensor status data (upper / lower limit alarm, sensor abnormality, radio wave intensity (RSSI), self-diagnosis information, etc.) are collected and processed to convert the converter data. Based on this, one data packet is created for each signal converter.

  The gateway 4 transmits a data collection command to the signal converters 1a, 1b, 1c, and 1d for each collection period. The signal converters 1a, 1b, 1c, and 1d are transmitted at predetermined transmission intervals from a predetermined address. The sequentially created data packets are wirelessly transmitted to the gateway 4. The gateway 4 receives the data packet by the wireless IF 7 and stores the fetched data packet in the collected data table 5. The collected data table 5 extracts measurement data and status data as converter data from the received data packet, and stores them separately for each node address (wireless address) of each signal converter.

  The converter data stored in the collection data table 5 is updated each time a data packet from the signal converter for each collection period comes. The data of each signal converter is extracted from the updated collection data table 5, the past converter data and the sequence number that is the update number of the collection cycle are deleted, and the newly collected converter data is sent to the measurement data table 6. Store. The measurement data table 6 is used for holding each converter data when data loss does not become a problem or when there is no abnormality in the communication status.

  The host computer 3 composed of a PC, a server, or a controller and the gateway 4 are connected using a general-purpose LAN. In order to collect the converter data of each signal converter, a monitoring data processing unit 10 is provided in the host computer 3. The monitoring data processing unit 10 polls the gateway 4 periodically through the LAN IF 9 at the update cycle of the host computer 3 independently of the sensor node collection cycle, and issues a data collection command. The gateway 4 receives the data collection command via the LAN IF 8, retrieves the updated converter data (measurement data, status data) previously stored in the measurement data table 6, and returns it as a response to the host computer via the LAN IF 8. To do. The host computer 3 temporarily stores the returned converter data in an internal file.

  The host computer 3 retrieves each converter data stored in the file, displays the temperature, pressure, flow rate, level, and calculation data trends on the GUI, converter status upper / lower limit alarm, sensor abnormality, self-diagnosis information When an error occurs, an alarm is output, the communication status and radio wave intensity are displayed, and the operator using the host computer 3 is notified.

Next, the configuration of each signal converter 1a, 1b, 1c, 1d, gateway 4, and host computer 3 will be described in detail.
(Signal converter)
In FIG. 2, a signal converter 1a which is a sensor node of a thermocouple inputs a thermoelectromotive force determined by a temperature-thermoelectromotive force of the thermocouple 2a at a thermocouple input unit 40, and performs voltage amplification. The temperature converter 41 receives the voltage-amplified signal, converts it into a digital signal by AD conversion, converts it into temperature data, and sets an upper / lower limit alarm when the temperature exceeds the upper / lower limit alarm value. If the thermocouple 2a is disconnected and the temperature data is swung out, a sensor abnormality is set.

The data holding unit 16 sets the temperature data as the measurement data 0, collects the upper / lower limit alarm and sensor abnormality of the temperature conversion calculation unit 41, the radio wave intensity of the RF transmission / reception unit 19, and the self-diagnosis information of the drive control unit 17 to obtain the status data 0. create. The data holding unit 16 shifts the calculation data held by the following procedure one by one, and updates the calculation data.
1) Measurement data 4 and status data 4 are stored in measurement data 5 and status data 5 2) Measurement data 3 and status data 3 are stored in measurement data 4 and status data 4 3) Measurement data 2 and status data 2 are measured 3 and stored in status data 3 4) Store measurement data 1 and status data 1 in measurement data 2 and status data 2 5) Store measurement data 0 and status data 0 in measurement data 1 and status data 1 Although the number of data is four, the same procedure can be executed for five or more data. The data holding unit 16 adds the sequence numbers one by one and stores them. The power supply unit 21 supplies DC power to each unit in the signal converter 1a. The Ch / address setting unit 20 takes in the frequency channel for wireless transmission from the Ch SW 23 and takes in and holds the node address of the own station from the AD SW 22. The drive control unit 17 receives the execution at every calculation cycle from the input of the thermocouple to the data retention and the data collection from the gateway 7 by the RF transmission / reception unit 19, and the transmission interval timer 18 receives the timer time = (node address−1) × Transmission interval (8ms)
Set. The transmission interval timer 18 starts timing after setting the timer time and outputs a time-up signal. The drive control unit 17 wirelessly outputs the converter data and the sequence number held in the data holding unit 16 via the RF transmission / reception unit 19 when time is up. The RF transmission / reception unit 19 adds a destination address (Address ID) and a wireless transmission control field to the converter data created by the data holding unit 16 to create a wireless transmission data packet, and wirelessly transmits it to the gateway 4.

  The signal converter 1b, which is a sensor node of the resistance temperature detector, causes a constant current to flow through the resistance temperature detector 2b at the resistance temperature detector input unit 42, and changes the resistance value determined by the temperature-resistance value of the resistance temperature detector 2b. Enter the voltage value. The temperature conversion calculation unit 43 receives the voltage signal, converts it into a digital signal by AD conversion, converts it into temperature data, and sets an upper / lower limit alarm when the temperature exceeds the upper / lower limit alarm value. When the resistance temperature detector 2b is disconnected and the temperature data is swung, a sensor abnormality is set. The processing after the data holding unit 16 is configured in the same manner as the signal converter 1a.

  The signal converter 1c which is a sensor node of the transmitter and the level meter supplies a constant voltage to the transmitter and the level meter 2C at the transmitter input unit 44, and the pressure or level change of the transmitter and the level meter 2C is 4/20 mA. Input as a unified signal and convert it to a voltage signal. The data conversion operation unit 45 receives the voltage signal, converts it into a digital signal by AD conversion, converts it into pressure or level data, and sets an upper / lower limit alarm when the pressure or level exceeds the upper / lower limit alarm value. When the wiring to the transmitter / level meter 2C is disconnected, the sensor / abnormality sensor 2C sets the sensor abnormality when the pressure or level data is swung out in the self-diagnosis of the transmitter / level meter 2C. The processing after the data holding unit 16 is configured in the same manner as the signal converter 1a.

An arithmetic unit 1d, which is a type of signal converter, inputs signals from each sensor at 4/20 mA or 1/5 V at a 4/20 mA 1/5 V input unit 46. The function calculation unit 47 receives the signal, converts it into a digital signal by AD conversion, executes function calculations such as filter calculation, upper / lower limit limit, selector, bias calculation, linearize calculation, upper / lower limit alarm calculation, and outputs calculation data . The processing after the data holding unit 16 is configured in the same manner as the signal converter 1a.
〔gateway〕
The gateway 4 receives the wireless data transmission packet from the signal converter by the wireless IF 7, and the wireless IF 7 deletes the control field of the received wireless data transmission packet and outputs the data packet. The collected data storage determination unit 15 receives the data packet, uses the source address included in the data packet as the node address of the signal converter, and the sequence number of the corresponding node address in the measurement data table 6 and the data packet The sequence number difference is calculated, and the sequence number change is calculated. Next, the sequence number change is compared with the collection period of the period determination unit 12.

Collection cycle> {| Sequence number change | × Calculation cycle (calculator) × n}
(N is set to 2 or more)
When the time from the sequence number change is less than the collection cycle, the collected data storage determining unit 15 outputs the communication status as abnormal (ERROR) because the converter data is not updated. If the time from the sequence number change is longer than the collection period, the normal / abnormal status is output as normal (NORMAL).

  In addition to the sequence number update determination, the collected data storage determination unit 15 compares the converter type of the corresponding node address, and outputs a communication status “ERROR” if they do not match. Thereby, it is possible to determine whether the signal converter is normal or abnormal. The collected data storage determination unit 15 stores the measurement data and status data of the converter data at the corresponding node address in the measurement data table 6.

The collected data table 5 outputs table data. The measurement data table 6 deletes and stores the past calculator data and the sequence number that is the update number of the calculation cycle from the output table data. The period determining unit 12 sets the data collection period to the data collection / collection timer 11 and outputs data collection to the wireless IF 7 in response to the time-up of the data collection / collection timer 11. The wireless IF 7 performs data collection on each signal converter. Wireless output. This is repeated every time up. The Ch setting unit 7 sets a frequency channel for wireless transmission.
[Host computer]
The data collection alarm check unit 26 of the wireless data processing unit 10 of the host computer 3 issues a data collection command including a node address to be collected via the LAN IF 9 in order to collect each converter data. The gateway 4 receives a data collection command via the LAN IF 8. The LAN IF 8 outputs a data collection command from the host computer to the command processing unit 14. The command processing unit 14 determines the type of command of the host computer, reads the measurement data and status data of the corresponding node address from the measurement data table 6 or the collected data table 5, and returns them to the host computer via the LAN IF 8. The data collection alarm check unit 26 receives the returned converter data via the LAN IF 9 and stores it in the measurement data recording file 27 together with the timed output of the RTC 25.

  The GUI 30 retrieves each converter data stored in the measurement data file 27, displays the trend of temperature, pressure, flow rate, level, and calculation data, and uses the converter status upper / lower limit alarm, sensor abnormality, and self-diagnosis information. An alarm is displayed when an error occurs. If the communication status is abnormal, a sensor node failure alarm is displayed.

  The host computer 3 is provided with an ID setting unit 28 for registering connection information between the gateway 4 and the signal converter in advance and collecting data. The ID setting unit 28 sets each node type (signal conversion) corresponding to the node ID to be configured as a system from the man-machine GUI 31 provided for “gateway / signal converter ID new, addition, deletion and collection cycle setting” in the host computer. Device type) and node address are input and stored in the node registration ID file 29. The sensor data collection unit 26 reads the node ID for data collection from the node registration ID file 29 via the ID setting unit 28. The ID setting unit 28 issues a node registration command including the node registration ID file to the node registration ID file 29 via the LAN IF 9.

The gateway 4 receives a node registration command via the LAN IF 8. The LAN IF 8 outputs a node registration command from the host computer to the command processing unit 14. The command processing unit 14 determines the command type of the host computer and writes the signal converter type and the node address to the collected data table 5. This makes it possible to specify the ID of each node in the collection data table 5 at the time of initialization after turning on the gateway.
[Wireless data transmission]
FIG. 3 shows a time chart of wireless data transmission. The period determination unit 12 of the gateway 4 transmits a data collection packet at a predetermined collection period. No. The No24 arithmetic unit receives a data collection packet from one converter, and each signal converter sets a timer time of (node address-1) × transmission interval (8 ms) in the transmission interval timer 18. Here, a case where there are 24 signal converters will be described. No. The transmission interval timer 18 of one converter immediately times up and transmits a data packet of “SD + data field + ED” of the converter data. Next, no. The transmission interval timer 18 of the three converters times up and transmits a data packet of converter data. Next, no. The transmission interval timer 18 of the two converters times up and transmits a data packet of converter data.

Thereafter, the operation is repeated in the same manner. The transmission interval timer 18 of the 24 arithmetic unit times out and transmits a data packet of converter data. Taking advantage of the broadcast property that is a feature of wireless data transmission, a single data collection packet from the gateway 4 is simultaneously received by all the signal converters without any difference, and the transmission interval timer 18 is started. By changing the timer time in proportion to each address, the data packets transmitted between the signal converters do not overlap and cause an error. Compared with the polling method, the above method eliminates the need to transmit a data collection packet for each signal converter from the gateway, so that all converter data can be collected in a short time. Thereby, the collection cycle can be shortened and fine measurement data can be sampled and the process can be monitored.
[Data packet]
FIG. 4 shows the relationship between the wireless transmission data packet and the collected data table 5. A data packet for wireless transmission consists of a control field and a data field. In addition to the preambles for synchronization, the control field indicates the start of frame delimiter (SD) indicating the start of the packet, the frame length indicating the following packet length, the frame control indicating the packet type, and the packet number. It consists of a Sequence No, an Address ID indicating the destination address, an FCS (Frame Check Sequence) for checking a bit error from the Frame Control to the data field attached to the end of the packet, and ED.

  The data field includes a data length indicating the following length of the data field, a target address indicating the address of the final recipient, a source address indicating the address of the transmission source of the data packet, and a data type indicating the type of the data packet. , A signal converter type indicating the type of the transmission source, a data header consisting of a sequence number updated at the signal converter calculation cycle, measurement data 1 and upper / lower limit alarm at the time of data collection, sensor abnormality, radio wave intensity, self Status data 1 consisting of diagnostic information, past measurement data 2 / status data 2 to measurement data 5 / status data 5, and byte addition for checking from the converter type to the status data 5 self-diagnosis information or Calculation result of exclusive OR It is composed of Sum_Check indicating fruit data.

  The node address of the node ID of the node registration file 29 and the signal converter type are written in the table unit 5 from the ID setting unit of the host computer via the LAN IF. In step (1), the node address of the collected data table 5 that matches the source address of the data packet is retrieved upon reception of the wireless data packet. Check the change of the signal converter type and sample number of the node number matching in (2). In (3), the data from the sequence number of the data field to the self-diagnosis information of measurement data 5 are written in the item numbers matched in (2).

Similarly, the process is executed every time a wireless transmission data packet comes. The collected data storage determining unit 15 compares the time calculated from the change of the sequence number of the data packet received and the collected data table 5 for each node address with the collection period of the period determining unit 12 and executes an update check. If not updated, the communication status is set to abnormal (ERROR). Next, the collected data table 5 stores the data in the measurement data table 6 in (4).
[Data transmission procedure]
FIG. 5 shows each step of the transmission procedure (flow). The host computer executes the initial by starting (1). After completing the initial in (2), issue a gateway reset via the LAN. The gateway (hereinafter referred to as GW in the figure) executes the initial operation when the power is turned on in (1) or the gateway is reset from the host computer. The signal converter executes initialization when the power is turned on in (1), and sets Ch data and address data. The gateway clears the collected data table at the time of initializing (1) and clears the communication status (Null). The gateway sets its communication status to INIT.

  The host computer confirms the gateway status in (3) via the LAN. The gateway reads the communication status of the gateway from the table part and returns INIT. The host computer executes the following (4) when the gateway status is INIT. In (4), the node registration file is read from the ID setting unit and set in the gateway. The gateway sets the data of the node registration file in the collected data table. The gateway starts a data collection timer and sets its communication status to NORMAL (normal). This completes the activation of the gateway and signal converter from the initials from the host computer.

  The signal converter starts collecting sensor data at the end of the initial of (1) (2), and creates measurement data 0 and status data 0. After the data in the data storage unit is moved in (3), measurement data 0 and status data 0 are stored, and the sequence number is incremented by +1. The signal converter repeats (2) and (3) every calculation cycle. The gateway determines the collection cycle in (3) and executes (4) in the collection cycle. The gateway sends a data collection packet in (4). The signal converter starts the transmission interval timer in (5) upon reception of data collection. The signal converter transmits a data packet when the transmission interval timer is up. In step (5), the gateway updates the data of the collected data table of the corresponding node address from the data packet of the signal converter. The communication status of the signal converter having the updated node address is set to NORMAL (normal) after checking the change of the sequence number. The gateway sets the communication status of the node address not received in (6) to ERROR (abnormal). The gateway stores the collected data table data in the measurement data table in (7). The gateway periodically executes (4) to (7).

The host computer reads the converter data stored in the collected data table of the gateway according to the following procedure and performs processing. Check the gateway status in (5). The gateway returns the communication status of the gateway in the collected data table. The host computer executes (6) when the gateway status is NORMAL, and executes (4) when it is INIT. If it is ERROR, execute (2). In (6), read the data in the gateway measurement data table or collection data table. The gateway returns the data of the specified node address table. In (7), check whether the communication status of the gateway and signal converter is ERROR (abnormal), and if abnormal, output an alarm. It also outputs alarms with status upper / lower limit alarms, sensor abnormalities, and self-diagnosis information. Save the converter data to the measurement data recording file in (8). In (9), display the trend / graph from the measured data. The host computer repeats (5) to (9).
When the host computer refers to past data in the collected data table, the table data stored in the collected data table is read from the gateway in (6). The read data is stored in a measurement data recording file corresponding to the measurement data number.

  FIG. 6 shows a procedure for storing the measurement data and status data 1 to 5 from the collected data table to the measurement data recording file. Measurement data 1 and status data 1 are stored together with time data output from the RTC 25 at the current time (t). Measurement data and status data 2 to 5 are stored at time (t−Δt) obtained by subtracting Δt from the current time t by calculating Δt by the calculation cycle of the signal converter × (data number −1). Collectively transmitting past data in the same data packet as the current data eliminates the need for data collection packets from the host computer to the signal converter via the gateway, reducing wireless transmission packets and simplifying wireless data transmission procedures. Can be made. In addition, when the past data is 4 or more, if the average packet loss rate is 1% and the collection period is 0.2 s, the frequency of occurrence of errors in which packets are lost 5 consecutive times will be about once every 30 years. Wireless data transmission with high reliability can be realized.

1a: signal converter, 1b: signal converter, 1c: signal converter, 1d: signal converter, 2a: sensor, 2b: sensor, 2c: sensor, 2d: sensor, 3: host computer, 4: gateway, 5 : Collection data table, 6: measurement data table, 7: wireless IF, 8: LAN IF, 9: LAN IF, 10: monitoring data processing unit, 11: data collection cycle timer, 12: cycle determination unit, 13: Ch setting Unit: 14: command processing unit, 15: collected data storage unit, 16: data storage unit, 17: drive control unit, 18: transmission interval timer, 19: RF transmission / reception unit, 20: Ch, address setting unit, 21: power supply Unit: 22: AD SW, 23: Ch SW, 25: RTC, 26: data collection alarm check unit, 27: measurement data recording file, 28: ID setting unit, 29: node registration ID file 30: GUI (trend graph, alarm), 31: GUI GW (Ch) / converter node ID (new, added, deleted collection cycle setting), 40: thermocouple input unit, 41: temperature conversion calculation unit, 42 : Resistance thermometer input unit, 43: Temperature conversion calculation unit, 44: Transmitter input unit, 45: Data conversion calculation unit, 46: 4/20 mA 1 / 5V input unit, 47: Function calculation unit

Claims (7)

A plurality of sensors that measure the process state, a plurality of signal converters that collect the measurement data and status data of each sensor to create a data packet including the converter data, and wirelessly transmit the data packets from the signal converter In a wireless network process monitoring system having a gateway that collects the data of the signal converter to a host computer that is collected and connected to the host computer, and a host computer that monitors the process state based on the converter data from the gateway,
The radio network process monitoring system according to claim 1, wherein the signal converter includes a transmission period timer for transmitting data packets to the gateway at a transmission interval proportional to an address when the gateway collects data.   2. The wireless network process monitoring system according to claim 1, wherein the gateway includes a collection data table storing converter data of data packets of the signal converter, and a new periodically updated data among the converter data. A wireless network process monitoring system comprising a measurement data table for storing various converter data.   3. The wireless network process monitoring system according to claim 1, wherein the signal converter includes a data holding unit that holds a sequence number that is updated every calculation cycle together with the calculator data, and the signal converter holds the data. A wireless network process monitoring system, wherein a data packet including converter data and a sequence number held in a unit is transmitted to the gateway.   4. The wireless network process monitoring system according to claim 3, wherein the gateway includes a collected data storage determination unit that detects a communication status abnormality from a comparison between a sequence number and a converter data collection period. Monitoring system.   4. The wireless network process monitoring system according to claim 3, wherein the gateway includes a collected data storage determination unit that detects a communication status abnormality from comparison between converter data and a converter type of a corresponding node address. Wireless network process monitoring system.   4. The wireless network process monitoring system according to claim 1, wherein the signal converter includes a data holding unit that stores past converter data for each calculation cycle, and the past converter data. And the new converter data is transmitted to the gateway, and the host computer calculates the time of the past converter data from the calculation cycle of the signal converter, and stores the collected past converter data. A wireless network process monitoring system comprising: a data collection alarm check unit having a function of preventing data loss due to data packet loss during wireless transmission.   7. The wireless network process monitoring system according to claim 6, wherein the signal converter has a data holding unit for storing converter data of past 4 data or more for each calculation cycle, and new conversion is performed together with past converter data. A wireless network process monitoring system, wherein device data is transmitted to the gateway.

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