WO2020095413A1 - Système de communication, dispositif de communication, procédé et programme - Google Patents

Système de communication, dispositif de communication, procédé et programme Download PDF

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Publication number
WO2020095413A1
WO2020095413A1 PCT/JP2018/041509 JP2018041509W WO2020095413A1 WO 2020095413 A1 WO2020095413 A1 WO 2020095413A1 JP 2018041509 W JP2018041509 W JP 2018041509W WO 2020095413 A1 WO2020095413 A1 WO 2020095413A1
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Prior art keywords
time
master
communication
slave
communication device
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PCT/JP2018/041509
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English (en)
Japanese (ja)
Inventor
直也 鋤柄
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三菱電機株式会社
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Priority to JP2019537407A priority Critical patent/JPWO2020095413A1/ja
Priority to PCT/JP2018/041509 priority patent/WO2020095413A1/fr
Publication of WO2020095413A1 publication Critical patent/WO2020095413A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter

Definitions

  • the present invention relates to a communication system, a communication device, a method, and a program.
  • a different communication cycle may be set for each slave or each group of slaves, and the slave may communicate with the master at the set communication cycle.
  • Patent Document 1 describes that slaves are divided into groups, and the slaves communicate with the master at different communication cycles for each group.
  • the master transmits the synchronization frame to the slave at regular intervals in order to notify the slave of the data transmission timing.
  • a value of a counter that is incremented each time the reference period elapses is set in the synchronization frame.
  • the slave determines that the value of the counter set in the received synchronization frame is the value indicating the communication cycle set for the group to which the slave belongs, the slave transmits data to the master.
  • the slave determines the timing of transmitting data to the master from the value of the counter set in the synchronization frame. Therefore, the synchronization frame needs to arrive at the slaves belonging to the same group at the same timing.
  • the slaves belonging to the same group have different timings for transmitting data to the master.
  • the synchronization accuracy decreases when the propagation delay, the delay due to the processing of the communication device, or the like occurs.
  • the synchronous communication cannot be established.
  • the present invention has been made in view of the above circumstances, and it is an object of the present invention to enable synchronous communication in a master-slave communication system when a different communication cycle is set for each slave.
  • a communication system includes a first communication device and a second communication device that function as slaves, and a third communication device that functions as a master, and performs synchronous communication in a master-slave system. ..
  • the first communication device and the second communication device are set to communicate with the master at different communication cycles.
  • the first clocking means of the slave clocks the time.
  • the slave synchronization determination means transmits data to the master depending on whether or not the time measured by the first time measuring means indicates that the time of the communication cycle set for the own device has elapsed from the set time. It is determined whether it is the transmission timing to perform.
  • the slave communication means transmits data to the master when the synchronization determination means determines that it is the transmission timing.
  • the second time measuring means of the master measures the reference time.
  • the time synchronization means of the master notifies the slave of the reference time so that the first time measurement means and the second time measurement means of the slave are time synchronized.
  • the first communication device and the second communication device that function as slaves are set to communicate with the master at different communication cycles.
  • the slave transmits data to the master depending on whether or not the time measured by the first clock means provided in the own device indicates that the time of the communication cycle set in the own device has elapsed from the set time. It is determined whether it is the transmission timing to perform.
  • the slave determines that it is the transmission timing, it transmits the data to the master.
  • the master notifies the slave of the reference time so that the first time measuring means and the second time measuring means of the slave are time-synchronized. With such a configuration, synchronous communication becomes possible when a different cycle is set for each slave.
  • Block diagram showing a functional configuration of a communication system according to an embodiment The figure which shows the hardware constitutions of the communication system which concerns on embodiment.
  • the communication system 1 includes a communication device 100, a communication device 201, and a communication device 202 that communicate with each other.
  • the communication device 100, the communication device 201, and the communication device 202 are communicably connected via the network 5.
  • the communication device 100, the communication device 201, and the communication device 202 communicate in a master-slave system.
  • the communication device 100 functions as a master.
  • the communication devices 201 and 202 function as slaves.
  • the communication devices 201 and 202 that function as slaves transmit and receive data under the control of the communication device 100 that functions as a master.
  • the communication device 100, the communication device 201, and the communication device 202 are, for example, programmable logic controllers that operate in a production system, a control system, or the like.
  • the communication devices 201 and 202 transmit the data collected from the sensors managed by the communication devices 201 and 202 to the communication device 100 that functions as a master at a preset timing.
  • the network 5 is, for example, a network based on the 100Base-T standard.
  • the communication device 100 that functions as a master may be simply referred to as a master.
  • the communication devices 201 and 202 that function as slaves may be simply referred to as slaves. Further, the communication devices 201 and 202 may be collectively referred to as the communication device 200.
  • the communication device 100 is an example of the third communication device of the present invention.
  • the communication device 201 is an example of the first communication device of the present invention.
  • the communication device 202 is an example of the second communication device of the present invention.
  • the communication device 201 is an example of the first slave of the present invention
  • the communication device 202 is an example of the second slave of the present invention.
  • the communication device 201 and the communication device 202 that function as slaves transmit data to the master at different cycles.
  • the communication device 201 and the communication device 202 transmit data to the master in a communication cycle that is an integral multiple of the common reference cycle Ts.
  • the common reference period Ts is a period synchronized with the master clock signal.
  • the communication cycle T1 of the communication apparatus 201 is set to a cycle that doubles the common reference cycle synchronized with the master clock signal
  • the communication cycle T2 of the communication apparatus 202 is set to the cycle that triples the common reference cycle. Is set.
  • the communication device 100 has a clock device 13, and the communication devices 201 and 202 each have a clock device 23. It is assumed that the times of the time measuring device 13 and the time measuring device 23 are the same.
  • the communication devices 201 and 202 functioning as slaves function as masters when it is determined that the time of the communication cycle set in the device itself has elapsed from the set time, based on the time of the clock device 23 of each of the communication devices 201 and 202. It is determined that it is time to transmit data to 100.
  • the communication devices 201 and 202 functioning as slaves perform communication functioning as a master when it is determined that the communication cycle time set in the communication device 201 has elapsed from the time when data was last transmitted to the master. Data is transmitted to the device 100. Since the master clock device 13 and the slave clock device 23 have the same time, the communication devices 201 and 202 that function as slaves transmit data to the communication device 100 that functions as a master at the set communication cycle. be able to.
  • the communication device 100 that functions as a master has, as a hardware configuration, a memory 11 that stores various programs and data, a communication interface 12 that communicates with the communication devices 201 and 202, and a time measurement. And a processor 14 for controlling the entire communication device 100.
  • the memory 11, the communication interface 12, and the timing device 13 are connected to the processor 14 via the bus 19 and communicate with the processor 14.
  • the memory 11 includes a volatile memory and a non-volatile memory.
  • the memory 11 stores a time synchronization program 111 for performing time correction and a communication parameter 112 for managing the entire network 5. It is assumed that the user who manages the communication system 1 uses the setting tool to previously store the time synchronization program 111 and the communication parameters 112 in the memory 11. Further, the memory 11 is used as a work memory for the processor 14.
  • the time synchronization program 111 is an example of the program of the present invention.
  • the time synchronization program 111 is executed by the processor 14.
  • the processor 14 executes the time synchronization program 111 to correct the time of the slave clock device.
  • the communication parameter 112 is a parameter necessary for the communication device 100 functioning as a master to manage the entire network 5.
  • the communication parameter 112 includes a parameter related to the communication cycle of each slave.
  • the communication interface 12 includes a network interface circuit for the communication device 100 to communicate with other communication devices.
  • the communication interface 12 converts the data supplied from the processor 14 into an electric signal, and transmits the converted signal to the communication device 200 via the network 5. Further, the communication interface 12 restores the electric signal received from the communication device 200 via the network 5 into data and outputs the data to the processor 14.
  • the clock device 13 is a device that includes an oscillation circuit that outputs a clock signal and that measures time.
  • the processor 14 includes an MPU (Micro Processing Unit) and executes various programs stored in the memory 11 to realize various functions of the communication device 100.
  • MPU Micro Processing Unit
  • the communication device 201 that functions as a slave has, as a hardware configuration, a memory 21 that stores various programs and data, a communication interface 12 that communicates with the communication device 100, a clock device 23 that measures time, and a communication device 201. And a processor 24 for controlling the whole.
  • the memory 21, the communication interface 22, and the timing device 23 are connected to the processor 24 via the bus 29 and communicate with the processor 24.
  • the communication device 202 also has the same configuration as the communication device 201.
  • the memory 21 includes a volatile memory and a non-volatile memory.
  • the memory 21 stores a communication program 211 for communicating with the master and communication parameters 212 used for communication with the master. It is assumed that the user who manages the communication system 1 uses the setting tool to store the communication program 211 and the communication parameters 212 in the memory 21 in advance.
  • the memory 21 is also used as a work memory for the processor 24.
  • the communication program 211 is executed by the processor 24.
  • the processor 24 executes the communication program 211 to transmit the data collected by the communication device 201 from the sensor to the master. Further, the processor 24 executes the communication program 211 to correct the time of the clock device 23 in cooperation with the master.
  • the communication parameter 212 is a parameter necessary for the communication device 201 functioning as a slave to communicate with the master.
  • the communication parameter 212 includes a parameter regarding a communication cycle indicating an interval at which the communication device 201 transmits data to the master.
  • the communication interface 22 includes a network interface circuit for the communication device 201 to communicate with other communication devices.
  • the communication interface 22 converts the data supplied from the processor 24 into an electric signal, and transmits the converted signal to the master via the network 5.
  • the communication interface 22 also restores the electric signal received from the master via the network 5 into data and outputs the data to the processor 24.
  • the clock device 23 is a device that includes an oscillation circuit that outputs a clock signal and that measures time.
  • the processor 24 includes an MPU and executes various programs stored in the memory 21 to realize various functions of the communication device 201. For example, when the processor 24 determines that the time measured by the clock device 23 is the set communication cycle, the processor 24 transmits the data to the master.
  • the communication device 100 functioning as a master is functionally equipped with a timekeeping unit 110 that measures time, a time synchronization unit 120 that performs time synchronization between a master and a slave, and parameters required for synchronous communication. And a communication unit 140 that communicates with the slave.
  • the clock unit 110 is an example of the second clock means of the present invention.
  • the time measured by the time measuring unit 110 is an example of the time measured by the present invention.
  • the clock unit 110 measures the time. Since the communication device 100 is the master, the time measured by the timer unit 110 is the reference time in the communication system 1. The function of the clock unit 110 is realized by the clock device 13 shown in FIG.
  • the time synchronization unit 120 shown in FIG. 1 cooperates with a time correction unit 220 of the communication device 200, which will be described later, to synchronize the time of the clock units 210 of the communication devices 201 and 202 so as to match the reference time.
  • the time synchronization unit 120 can adopt a time synchronization protocol defined in IEEE (Institute of Electrical and Electronics Engineers) 1588, IEEE802.1AS, or the like as a specific method of time correction. A specific method of time correction will be described later.
  • the function of the time synchronization unit 120 is realized by the processor 14 shown in FIG.
  • the time synchronization unit 120 is an example of the time synchronization means of the present invention.
  • the synchronization information storage unit 130 shown in FIG. 1 stores parameters regarding the communication cycle.
  • the communication device 201 and the communication device 202 communicate with the master in a communication cycle that is an integral multiple of the common reference cycle Ts.
  • the communication cycle T1 of the communication apparatus 201 is the reference cycle Ts multiplied by M (M is a natural number)
  • the communication cycle T2 of the communication apparatus 202 is N times the reference cycle Ts (N is a natural number). Set it as what you did.
  • the communication cycle T1 of the communication device 201 is an example of the first cycle of the present invention
  • the communication cycle T2 of the communication device 202 is an example of the second cycle of the present invention.
  • the communication device 201 sets the communication cycle T1 so as to communicate with the master at shorter intervals than the communication device 202.
  • the communication device 201 transmits data to the master in a communication cycle T1 that is twice the reference cycle Ts.
  • the communication device 202 transmits data to the master in a communication cycle T2 that is three times the reference cycle Ts.
  • the synchronization information storage unit 130 shown in FIG. 1 stores a reference cycle and information indicating how many times the communication cycle of the slave is the reference cycle. This information is provided by the master to the slave prior to the master and slave communicating.
  • the function of the synchronization information storage unit 130 is realized by the memory 11 shown in FIG.
  • the communication unit 140 shown in FIG. 1 transmits / receives data to / from a slave.
  • the communication unit 140 transmits the message for time synchronization output from the time synchronization unit 120 to the communication devices 201 and 202.
  • the function of the communication unit 140 is realized by the communication interface 12 shown in FIG.
  • the communication device 201 functioning as a slave is functionally equipped with a time measuring unit 210 for measuring the time and a time correcting unit 220 for cooperating with the master to correct the time measured by the time measuring unit 210. And a synchronization information storage unit 230 that stores parameters necessary for synchronous communication, a synchronization determination unit 240 that determines the timing of transmitting data to the master, and a communication unit 250 that communicates with the master.
  • the clock unit 210 measures the time.
  • the time measured by the timer unit 210 is used by the later-described synchronization determination unit 240 to determine the data transmission timing.
  • the function of the clock unit 210 is realized by the clock device 23 shown in FIG.
  • the clock unit 210 is an example of the first clock means of the present invention.
  • the time measured by the time measuring unit 210 of the communication device 201 is an example of the first time measuring time of the present invention.
  • the time measured by the time measuring unit 210 of the communication device 202 is an example of the second time measuring time of the present invention.
  • the time correction unit 220 shown in FIG. 1 cooperates with the time synchronization unit 120 of the communication device 100 described above to correct the time measured by the clock unit 210. A specific method of time correction will be described later.
  • the function of the time correction unit 220 is realized by the processor 24 shown in FIG.
  • the time correction unit 220 is an example of the time correction means of the present invention.
  • the synchronization information storage unit 230 shown in FIG. 1 stores parameters related to synchronization.
  • the communication cycle of the communication device 201 is a cycle that is M times the reference cycle (M is a natural number)
  • the communication cycle of the communication device 202 is a cycle that is N times the reference cycle (N is a natural number). .. Therefore, the synchronization information storage unit 230 of the communication device 201 stores the reference period and information indicating that the communication period is M times the reference period.
  • the synchronization information storage unit 230 of the communication device 202 stores the reference cycle and information indicating that N times the reference cycle is the communication cycle.
  • the data stored in the synchronization information storage unit 230 is provided from the master to the slave before the master and the slave communicate with each other.
  • the function of the synchronization information storage unit 230 is realized by the memory 21 shown in FIG.
  • the synchronization determination unit 240 shown in FIG. 1 indicates that the time measured by the time counting unit 210 indicates that the time of the communication cycle in which the synchronization information storage unit 230 is stored has elapsed from the time when the previous data was transmitted to the master. , It is determined that it is time to transmit data to the master.
  • the function of the synchronization determination unit 240 is realized by the processor 24 shown in FIG.
  • the synchronization determination unit 240 is an example of the synchronization determination means of the present invention.
  • the timing of transmitting data to the master determined by the synchronization determining unit 240 is an example of the transmission timing of the present invention.
  • the communication unit 250 shown in FIG. 1 communicates with the master. For example, when the communication determination unit 240 is notified by the synchronization determination unit 240 that it is time to transmit data, the communication unit 140 transmits data to the master. Further, the communication unit 250 outputs the message for time synchronization received from the master to the time correction unit 220.
  • the function of the communication unit 250 is realized by the communication interface 22 shown in FIG.
  • the communication section 250 is an example of the communication means of the present invention.
  • the processor 14 of the master communication device 100 executes the time synchronization program 111, and the processor 24 of the slave communication device 200 executes the communication program 211 to perform the following processing.
  • the master processor 14 first transmits a Sync message indicating the start of time synchronization to the slave. At this time, the master processor 14 stores in the memory 11 the time t1 of the clock device 13 when the Sync message is transmitted.
  • the Sync message is an example of the first message of the present invention.
  • the master shall transmit a Sync message at regular intervals after establishing communication with the slave.
  • the slave processor 24 Upon receiving the Sync message, the slave processor 24 stores in the memory 21 the time t2 of the clock device 23 at the time of receiving the Sync message.
  • the master processor 14 waits for the set time after transmitting the Sync message, and then generates a Follow_Up message for notifying the slave of the time t1, and the generated message has the time t1 stored in the memory 21. To send the message to the slave.
  • the slave processor 24 Upon receiving the Follow_Up message, the slave processor 24 stores the time t1 set in the Follow_Up message in the memory 21. The slave processor 24 waits for a preset time after receiving the Follow_Up message, and then sends a Delay_Req message to the master to respond to the master. Furthermore, the slave processor 24 stores in the memory 21 the time t3 of the clock device 23 when the Delay_Req message was transmitted.
  • the Delay_Req message is an example of the second message of the present invention.
  • the master processor 14 Upon receiving the Delay_Req message, the master processor 14 stores in the memory 11 the time t4 of the clock device 13 at the time of receiving the Delay_Req message. The master processor 14 waits for a preset time, generates a Delay_Resp message for responding to the slave, sets the time t4 stored in the memory 11 in the generated message, and sends the message to the slave. Send.
  • the slave processor 24 stores the time t4 set in the message in the memory 21.
  • Delay time Dly1 ⁇ (t2-t1) + (t4-t3) ⁇ / 2 (1)
  • the slave calculates the one-way delay time Dly1 from the acquired values of t1 to t4 and the above equation (1).
  • the slave adjusts the time of the clock unit 210 by the calculated delay time Dly1.
  • the slave calculates the offset Offset1 of the clock of the slave from the acquired values of t1 to t4 and the above equation (2).
  • the slave adjusts the time of the clock unit 210 by the calculated offset Off1.
  • the above-described processing is performed because the difference between the time of the slave time measuring device 23 and the time of the master time measuring device 13 is (a) the propagation delay, and (b) the time of the slave time measuring device 13 and the time of the master. This is because of the difference between the time of the clock device 23 and the time.
  • the time measured by the timer 210 is corrected by the time corresponding to the delay time Dly1 and the offset Off1.
  • the delay time Dly1 is an example of the propagation delay time of the present invention.
  • the offset Off1 is an example of the offset of the present invention.
  • the master transmits parameters relating to the communication cycle to the slave, and cooperates with the slave to correct the time of the clock device 23 of the slave.
  • the processor 24 of the communication device 201 illustrated in FIG. 2 executes the communication program 211 to correct the time of the clock device 23 as well as the process of transmitting data to the master.
  • the data transmission process is started. Note that the communication device 202 also performs the same processing.
  • the processor 24 of the communication device 201 stores the parameter relating to the communication cycle received from the master as the communication parameter 212 in the memory 21 (step S21).
  • the parameters related to the communication cycle received from the master include the reference cycle Ts and the communication cycle of the communication device 201.
  • the communication cycle T1 of the communication device 201 is set to the reference cycle Ts ⁇ 2 times.
  • the communication cycle T2 of the communication device 202 is set to the reference cycle Ts ⁇ 3 times. Further, it is assumed that the time of the slave timing device 23 is behind the time of the master timing device 13.
  • the processor 24 determines whether or not to perform time correction (step S22). Specifically, the processor 24 determines whether or not the communication interface 22 has received the Sync message shown in FIG. 4 from the master. When the communication interface 22 receives the Sync message, the processor 24 determines that the time correction should be performed (step S22; Yes), executes the following process, and executes the time counting device 23 shown in FIG. The time is corrected (step S23).
  • step S23 shown in FIG. 5 the processor 24 specifically stores in the memory 21 the time of the clock device 23 at the time of receiving the Sync message shown in FIG. This time corresponds to time t2 shown in FIG.
  • the processor 24 waits for the communication interface 22 to receive the Follow_Up message, and when the communication interface 22 receives the Follow_Up message, stores the time data set in the message in the memory 21.
  • the time data set in the Follow_Up message is the time at which the master transmitted the Sync message, and is the data indicating the time measured by the master clock device 13. This time corresponds to time t1 shown in FIG.
  • the processor 24 Upon receiving the Follow_Up message, the processor 24 transmits a Delay_Req message to the master via the communication interface 22.
  • the processor 24 stores the time of the clock device 23 at the time of transmitting the Delay_Req message in the memory 21. This time corresponds to time t3 shown in FIG.
  • the processor 24 stores the time data set in the message in the memory 21.
  • the time data set in the Delay_Resp message is the time at which the master received the Delay_Req message, and is the data indicating the time measured by the timer device 13 of the master. This time corresponds to time t4 shown in FIG.
  • the processor 24 calculates the delay time Dly1 from the time data stored in the memory 21 using the above equation (1), and further calculates the offset Off1 using the equation (2).
  • the processor 24 corrects the time of the clock device 23 so as to be advanced by a time corresponding to the delay time Dly1 and the offset Off1. After that, in step S24, the processor 24 determines whether or not the time of the clock device 23 is the time that matches the communication cycle set in the own device (step S24). Here, it is assumed that the communication cycle of the communication device 201 is set as a communication cycle T1 in which the reference cycle Ts is doubled, as shown in FIG. When the time of the clock device 23 indicates the timing that coincides with the communication cycle set for itself (step S24; Yes), the processor 24 transmits data to the master (step S25).
  • the slave transmits data to the master from the time of the clock device 23 of the own device at a timing that matches the communication cycle set for the own device. Therefore, it is possible to perform synchronous communication between the master and the slave without transmitting the time synchronization frame from the master to the slave. Therefore, when the time synchronization frame is used as in Patent Document 1, there is no influence of the delay of the time synchronization frame. Furthermore, each slave corrects the time of its own timekeeping device 23 to match the reference time of the master timekeeping device 23. Therefore, it is possible to suppress a decrease in synchronization accuracy due to an error between the master and slave clocks.
  • the slave determines the time measuring apparatus 23 synchronized with the master time measuring apparatus 13 and how many times the communication cycle is the reference cycle. With the information shown, each slave can communicate with the master at different communication cycles.
  • slaves on the same network can communicate with the master at different communication cycles, for example, slaves with low processing capacity and slaves with high processing capacity can communicate on the same network. As a result, for example, a slave with high processing capacity does not need to communicate with the master at the same timing as a slave with low processing capacity. In addition, a situation in which a slave with low processing capability cannot communicate with a slave with high processing capability in the same cycle and cannot connect to the network does not occur.
  • a device other than the master for example, a time server may be added to the communication system.
  • the time server includes a time measuring device that measures a reference time.
  • the time server delivers the data indicating the reference time to the master and the slave.
  • the master and slave may correct the time of their own timekeeping device so as to match the supplied reference time.
  • the time correction unit 220 of the communication device 200 calculates the delay time Dly1 and the offset Off1 between the master clock and the slave clock, and corrects the time according to the calculated delay time Dly1 and offset Off1.
  • the example has been described, but the present invention is not limited to this.
  • the time correction unit 220 may use only the delay time Dly1 to correct the time, or may use only the offset Off1 to correct the time.
  • the communication device 200 may further use a clock adjustment algorithm to correct the time of the clock device 23.
  • the communication device 100 functioning as a master may calculate the correction value of the clock device 23 using the clock adjustment algorithm and supply the calculated correction value to the communication device 200. In this case, the communication device 200 may correct the time of the clock device 23 with the correction value supplied from the communication device 100.
  • the communication cycle T1 of the communication apparatus 201 is set to the reference cycle Ts ⁇ 2 times
  • the communication cycle T2 of the communication apparatus 202 is set to the reference cycle Ts ⁇ 3 times
  • the reference cycle Ts is multiplied by M and N.
  • M and N may be natural numbers and are not limited to integers.
  • M and N are set so that the communication cycle with the higher processing capacity is shortened and the communication cycle with the lower processing capacity is lengthened. It is desirable to determine the value of For example, when the processing capability of the communication device 201 is higher than the processing capability of the communication device 202, M> N may be set. When the processing capability of the communication device 201 is lower than the processing capability of the communication device 202, M ⁇ N may be set.
  • the communication device 201 transmits data to the master in the communication cycle T1 and the communication device 202 transmits data to the master in the communication cycle T2 in the embodiment
  • the communication cycle is different for each device.
  • the slaves may be divided into groups and different communication cycles may be set for each group. Therefore, one or more slaves in the same group transmit data to the master in the same communication cycle.
  • the synchronization accuracy due to the error between the clocks of the master and the slave is improved. The decrease can be suppressed.
  • time synchronization protocol of IEEE1588 is adopted as the time synchronization method
  • the time synchronization method is not limited to this, and other time synchronization protocols may be synchronized.
  • the set time that is the starting point for counting the elapsed time of the set communication cycle is the time when the slave last transmitted the data to the master, but the present invention is not limited to this.
  • the set time may be the time when the specific notification is received from the master.
  • a computer-readable recording medium including a magnetic disk, an optical disk, a magneto-optical disk, a flash memory, a semiconductor memory, and a magnetic tape can be used.

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Abstract

Un système de communication (1) effectue une communication synchrone par un modèle maître-esclave. Un dispositif de communication (201) et un dispositif de communication (202) servant d'esclaves sont configurés pour communiquer avec un dispositif de communication (100) servant de maître à des cycles de communication dissemblables. Une unité de détermination de synchronisation (240) de chacun des dispositifs de communication (201, 202) détermine si le temps en question coïncide avec un instant de transmission pour transmettre des données au dispositif de communication (100) en accord avec le temps cadencée par une unité d'horloge (210) indiquant qu'un instant correspondant au cycle de communication réglé du dispositif de communication (201, 202) s'est écoulé depuis le temps défini. Une unité de communication (250) transmet les données au dispositif de communication (100) lorsque l'unité de détermination de synchronisation (240) détermine que le temps en question coïncide avec l'instant de transmission Une unité d'horloge (110) du dispositif de communication (100) mesure un temps de référence. Une unité de synchronisation temporelle (120) rapporte le temps de référence aux dispositifs de communication (201, 201) et effectue une synchronisation temporelle de l'unité d'horloge (210) et de l'unité d'horloge (110).
PCT/JP2018/041509 2018-11-08 2018-11-08 Système de communication, dispositif de communication, procédé et programme WO2020095413A1 (fr)

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