JP2001211106A - Transmission system with abnormality monitor function, terminal device with abnormality monitor function, and recording medium storing processing program for terminal device with abnormality monitor function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transmission system equipped with an abnormality monitor function which can detect abnormality for each socket by sending monitor data for each socket in a prescribed cycle and monitoring a transmission line, with respect to socket communication carried out between terminal devices having the TCP/IP protocol. SOLUTION: This transmission system 1 is a transmission system which can monitor abnormality during socket communication between terminal devices having the TCP/IP protocol by connecting the terminal devices by a LAN and is characterized in that the terminal devices 2 and 3 send and receive transmit data to and from each other and also send and receive monitor data for each socket in a proscribed cycle and it decides that abnormality occurred in the line if the monitor data cannot be sent and received for a prescribed time to close and then reconnect the line.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a TCP / IP (Tr
A transmission system that performs socket communication between terminal devices that implements an Ansmission Control Protocol / Internet Protocol). In particular, an abnormality is detected for each socket by transmitting monitoring data of a fixed period for each socket and monitoring the abnormality. The present invention relates to a transmission system having an abnormality monitoring function, a terminal device having an abnormality monitoring function, and a recording medium recording a processing program in a terminal device having an abnormality monitoring function.

[0002]

2. Description of the Related Art Conventionally, personal computers and PLCs (Programmable
e Logic Controler) and LAN (Loss) such as Ethernet between terminal devices such as workstations.
cal Area Network) for socket communication.

[0003] As an example of such communication, a general transmission system conventionally performed between a pump station and a treatment plant in a water supply business will be described with reference to FIG.

[0004] As shown in FIG.
01 is the P connected to the monitoring device 103 of the processing plant 102
It comprises an LC 104, a PLC 107 connected to a pump 106 of a pump station 105, and a transmission line 108 connecting between the processing station 102 and the pump station 105.

Here, the PLCs 104 and 107 are TCP
/ IP protocol is implemented, and transmission data is transmitted and received by socket communication. There are a plurality of sockets, and sockets for transmitting digital data, analog data, pulse data, digital output, set value output, and the like are provided.

The transmission path 108 is a transmission path using a LAN such as Ethernet. In the case of Ethernet, in particular, each of the PLCs 104, 10 is connected via a transceiver cable, a transceiver, and an Ethernet coaxial cable.
7 are connected. In some cases, the connection is made by an optical fiber cable installed in a sewer pipe via an ATM router.

The TCP transmission by the conventional transmission system will be described with reference to a flowchart.

First, the processing in the PLC 104 on the transmitting side will be described with reference to the flowchart of FIG. The transmitting side first actively opens a socket for transmitting transmission data among a plurality of sockets, and requests the receiving side to establish a connection (S501). At this time, if the corresponding socket on the receiving side is not passively opened,
Since the connection is not established, the process returns to step S501 to continue requesting the connection, and establishes the connection when the socket on the receiving side is passively opened (S502). After the connection is established, if there is transmission data such as an operation instruction of the pump by the operator or the operation status of each device, the transmission can be performed at any time. Then, it is determined whether or not transmission data has been input by the operator (S503), and when the transmission data has been input, the transmission data is transmitted (S504).
Then, when it is determined in step S503 that the transmission data has not been input, or when the transmission data input in step S504 has been transmitted, it is determined whether or not to continue the connection (S505). Here, to terminate the connection, the socket is closed (S506) to terminate the transmission, and to continue to establish the connection, the process returns to step S503 to continue the transmission.

Next, the processing in the PLC 107 on the receiving side will be described with reference to the flowchart of FIG. The receiving side first passively opens the socket from which data is transmitted, and requests the PLC 104 on the transmitting side to establish a connection (S601). At this time, if the transmission side is not actively open, the connection is not established because the connection is not established, and the process returns to step S601 to continue requesting the establishment of the connection. If the transmission side is actively open, the connection is established (S602). When the connection is established, it is determined whether or not transmission data is being transmitted (S603). If the transmission data is being transmitted, the transmission data is received (S60).
4). If it is determined in step S603 that the transmission data has not been transmitted, or if it is determined in step S604
When the transmission data transmitted in step (1) is received, it is determined whether or not to continue the connection (S605).
When ending the connection, the socket is closed (S606) to end the transmission, and when continuing to establish the connection, the process returns to step S603 to continue receiving the transmission data.

[0010]

However, in the above-described conventional transmission system, when an abnormality such as disconnection of a cable on a transmission line or power supply of a terminal device occurs, the transmission-side PLC 104 transmits transmission data. Therefore, the receiving-side PLC 107 cannot receive the transmission data.

[0011] However, despite the fact that the transmission data cannot be transmitted and received due to the occurrence of an error, the TCP / IP
In the transmission by the protocol, once a connection has been normally established, the connection remains established and is not disconnected. Therefore, each PLC
In 104 and 107, no abnormality can be detected, and a situation may occur as if transmission is normal. In particular, since it is determined that the application software of the PLCs 104 and 107 is normal, no abnormality can be detected. Therefore, if the operator falls into this state, the operator cannot notice the abnormality until the transmission data is actually transmitted, which may cause a safety problem in a treatment facility in a water supply business. For example, the monitoring device 103 of the pump station 105 and the processing station 102 at a remote location
In the communication between the two, the TCP / IP protocol transmission is often used when transmitting an operation signal of a device such as a pump, and this operation signal is generated when an operator inputs a command to the monitoring device 103. Things. However,
The operator may not operate the device for a long time such as one day. At this time, an abnormality will be noticed only when the operator actually attempts to operate the device after a long time has elapsed since the failure. If the operation at this time was an urgent operation such as an emergency stop of the pump, if an abnormality was found during the operation, cutoff of water, transmission of water, flooding of rainwater, flooding of the treatment plant, etc. There was a problem that caused a serious situation.

Further, the PLCs 104 and 107 may fall into a non-response state in which they do not operate. In this case, a mechanism for restoring the situation has not been established. Was.

As another method for monitoring an abnormality on a line, the Internet Control Message Protocol (ICMP) is used.
A method using the ing command is also conceivable. This pi
The ng command is a command for verifying whether communication is normally performed in ICMP.

In the ping command, the transmission side PL
An echo request message is created and transmitted from C104, and the PLC 107 on the receiving side returns an echo reply message when receiving the message.
This echo reply message is transmitted to the PLC 10 on the transmission side.
If it can be received at 4, it can be confirmed that there is no obstacle on the line.

However, in this case, a dedicated socket for monitoring a line failure is provided to monitor the line failure. Therefore, when a failure occurs in which all sockets become abnormal, the ping is surely performed. Although it can be detected by a method using a command, when a failure occurs only in a socket other than the monitoring socket, the failure cannot be detected by a method using the ping command.

Also, a method of monitoring a line by transmitting fixed-cycle data according to the UDP protocol is often used. In this method, too, a monitoring UDP socket is provided to monitor an abnormality of the line. Therefore, even if an abnormality has occurred in the TCP socket, if the UDP socket is normally transmitted, the abnormality in the TCP socket cannot be detected.

Therefore, even when the ping command is used or the UDP protocol is used, an abnormality can be detected when a failure occurs in the entire line. However, only the sockets other than the line monitoring socket can be detected. However, when an abnormality occurs, the abnormality cannot be detected.

Conversely, when a line monitoring socket is provided, if an abnormality occurs in the line monitoring socket,
Since all the sockets are stopped, there is also a problem that even the sockets where transmission is normally performed are stopped.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to detect abnormalities for each socket by transmitting monitoring data of a fixed period for each socket and monitoring a transmission path. It is an object of the present invention to provide a transmission system having an abnormality monitoring function, a terminal device having an abnormality monitoring function, and a recording medium recording a processing program in a terminal device having an abnormality monitoring function.

[0020]

In order to achieve the above object, a transmission system having an abnormality monitoring function according to the first aspect of the present invention uses a LAN to connect terminal devices equipped with a TCP / IP protocol. Connected, a transmission system having an abnormality monitoring function of monitoring an abnormality when transmitting and receiving transmission data by socket communication between the terminal devices, wherein the transmission data, a certain amount to monitor the abnormality A first terminal device for transmitting, on a socket-by-socket basis, monitoring data transmitted periodically, and, when the monitoring data has not been transmitted for a certain period of time, closing and initializing the failed socket; A transmission path for transmitting the transmission data and the monitoring data transmitted by the terminal device, and the transmission data and the monitoring data transmitted by the transmission path. Received in each socket, wherein when the monitoring data is not received a certain time, characterized in that it is composed of the second terminal device to be initialized after closing the not received socket.

According to the first aspect of the present invention, when monitoring data cannot be transmitted / received for a certain period of time, it is determined that an abnormality has occurred and the corresponding socket is closed and initialized, so that the abnormality has occurred. It is possible to prevent the connection from being kept established without noticing the error, and it is possible to quickly detect an abnormality in the line.

Further, since monitoring data is transmitted and received for each socket and an abnormality is monitored for each socket, it is not necessary to provide a dedicated socket for monitoring a line failure, and all the lines become abnormal. Even if a failure occurs such that only one socket becomes abnormal, the abnormality can be detected. Furthermore, even when an abnormality occurs in one socket, it is no longer necessary to stop other normally transmitting sockets.

The terminal device having the abnormality monitoring function according to the second aspect of the present invention implements the TCP / IP protocol and transmits and receives transmission data by socket communication with another terminal device connected by a LAN. When the terminal device has an abnormality monitoring function of monitoring an abnormality when the transmission data is transmitted to the other terminal device,
In addition to transmitting the transmission data, monitoring data for monitoring an abnormality is transmitted for each socket at a fixed cycle, and when the monitoring data cannot be transmitted for a predetermined time, the socket that could not be transmitted is closed and then initialized. And
When receiving transmission data from the other terminal device,
While receiving the transmission data, receive the monitoring data transmitted from the other terminal device at a constant cycle for each socket, and when the monitoring data has not been received for a predetermined time, close the socket that has not been received. It is characterized in that the initialization is performed after the initialization.

According to the second aspect of the present invention, it is possible to prevent a connection from being left unestablished without noticing that an abnormality has occurred, and it is possible to quickly detect a line abnormality. .

Further, it is not necessary to provide a dedicated socket for monitoring a line failure, and not only a failure that causes all the lines to become abnormal, but also a failure that causes only one socket to become abnormal. Even if it does, the abnormality can be detected. Furthermore, even when an abnormality occurs in one socket, it is no longer necessary to stop other normally transmitting sockets.

A recording medium for recording a processing program in a terminal device having an abnormality monitoring function according to the third aspect of the present invention implements a TCP / IP protocol,
A recording medium recording a processing program in a terminal device having an abnormality monitoring function of monitoring an abnormality when transmitting and receiving transmission data by socket communication with another terminal device connected by the communication device, wherein the transmission data is When transmitting to the other terminal device, a process of transmitting the transmission data, a process of transmitting monitoring data for monitoring an abnormality for each socket at a fixed cycle, and the monitoring data could not be transmitted for a fixed time Sometimes includes a process of closing the socket that could not be transmitted and then initializing, and when receiving the transmission data from the other terminal device, a process of receiving the transmission data and a certain process from the other terminal device A process of receiving monitoring data transmitted periodically for each socket, and receiving the monitoring data if the monitoring data has not been received for a predetermined time. Characterized in that it comprises a process of initializing the close the never been socket.

According to the third aspect of the present invention, it is possible to prevent a connection from being left unestablished without noticing that an abnormality has occurred, and it is possible to quickly detect a line abnormality. .

Further, it is not necessary to provide a dedicated socket for monitoring a line failure, and not only a failure that causes all the lines to become abnormal but also a failure that causes only one socket to become abnormal occurs. Even if it does, the abnormality can be detected. Furthermore, even when an abnormality occurs in one socket, it is no longer necessary to stop other normally transmitting sockets.

[0029]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a transmission system having an abnormality monitoring function according to the present invention will be described below with reference to the drawings.

As shown in FIG. 1, in a transmission system 1 having an abnormality monitoring function according to the present invention, a transmitting terminal device 2 and a receiving terminal device 3 are connected to a LAN (Local Area Network) such as Ethernet.
AreaNetwork).

The terminal device 2 on the transmitting side includes a personal computer, a workstation, and a PLC (Programmable Logic Control).
ler) and other TCP / IP (Transmission Control Prot)
ocomp / Internet Protocol) is a computer that can perform socket communication, transmits transmission data via a LAN such as Ethernet, and transmits monitoring data at a constant period for each socket. . There are a plurality of such sockets. For example, for transmission between a treatment plant and a pump station in a water supply business, sockets for transmitting digital data, analog data, pulse data, digital output, set value output, and the like are prepared.

Similarly, the terminal device 3 on the receiving side is a computer on which the TCP / IP protocol such as a personal computer, a workstation, or a PLC is mounted, can perform socket communication, and is transmitted via a LAN such as Ethernet. In addition to receiving data, it also receives monitoring data sent at a fixed cycle for each socket.

The terminal devices 2 and 3 include a normal computer system including a CPU for performing various processes and a storage unit for storing instructions for the processes, and are performed by the terminal devices 2 and 3. Instructions and timing constraints for each process are stored in a storage unit, and are loaded into the CPU and executed as needed.

A transmission path connecting the transmitting-side terminal device 2 and the receiving-side terminal device 3 is constituted by a LAN,
Particularly when the LAN is Ethernet, the terminal device 2 on the transmitting side is connected to the Ethernet coaxial cable 6 via the transceiver cable 4 and the transceiver 5, and the terminal device 3 on the receiving side is similarly connected via the transceiver cable 7 and the transceiver 8. Connected to the Ethernet coaxial cable 6. Further, by using an ATM router instead of the transceiver, an optical fiber cable may be used instead of the Ethernet coaxial cable to provide a transmission path.

Next, transmission of data and monitoring of abnormalities by the transmission system having the abnormality monitoring function of the present embodiment will be described with reference to the flowcharts of FIGS.

First, the processing in the terminal device 2 on the transmitting side will be described with reference to the flowchart of FIG. On the transmitting side, first, as initialization processing, a socket for transmitting data among a plurality of sockets is actively opened, and a request is made to the receiving side to establish a connection (S201). At this time, if the corresponding socket on the receiving side is not passively opened, the connection is not established, so the process returns to step S201 and continues to request the establishment of the connection.
When the socket on the receiving side is passively opened, a connection is established (S202). After the connection is established, if there is transmission data such as the operation instruction of the pump by the operator and the operation status of each device,
It can be transmitted at any time. Then, it is determined whether or not transmission data is input from the operator (S203), and when the transmission data is input, the transmission data is transmitted (S204). Then, it is confirmed whether or not the transmission data has been transmitted to the terminal device 3 on the receiving side (S205), and if it has been transmitted, it is determined whether or not to continue the connection (S206). Here, when terminating the connection, the socket is closed (S207), and the transmission is terminated.

On the other hand, when transmission data has not been input yet in step S203, when transmission data has not been transmitted in step S205, or when step S206
When the connection is continued to be established, the monitoring data for monitoring that the line is normal is transmitted. Since this monitoring data is transmitted at a fixed cycle, for example, at intervals of 30 seconds, it is determined whether or not a fixed time (for example, 30 seconds) corresponding to the cycle has elapsed (S208). When this is done, the monitoring data is transmitted (S2
09). Here, this monitoring data is transmitted to the terminal device 3 on the receiving side.
It is confirmed whether or not the data has been transmitted (S210). If the data has been transmitted, the process returns to step S203 to determine the presence or absence of the next transmission data and the transmission is continued. On the other hand, when the monitoring data is not transmitted, the monitoring data is continuously transmitted for a predetermined time, for example, several minutes (S211). When the monitoring data is transmitted during that time, it is determined that the monitoring data is normal, and the process returns to step S203 to continue the transmission. However, when the monitoring data is not transmitted to the receiving side for a certain period of time, it is determined that an abnormality has occurred and the operator is notified of the occurrence of the abnormality and the socket is closed (S213). And, again, step S
Returning to step 201, active open is performed, a reconnection request is made, initialization is performed, and transmission of transmission data is started again.

As described above, in the transmission system having the abnormality monitoring function of the present invention, even if monitoring data is continuously transmitted for a certain period of time, if it is not transmitted to the receiving side, it is determined that an abnormality has occurred and the line is closed once. And then request a reconnection.

[0039] Thus, it is possible to prevent a connection from being maintained even though an abnormality has occurred, so that the abnormality can be detected promptly. It is possible to prevent a situation in which an abnormality is not noticed until an operation command is input.

Next, the processing in the terminal device 3 on the receiving side will be described with reference to the flowchart of FIG. The receiving side first passively opens a socket from which transmission data is transmitted as an initialization process, and requests the transmitting side to establish a connection (S301). At this time, if the corresponding socket on the transmitting side is not actively opened, the connection is not established, so that step S301 is performed.
Then, the connection is continuously requested, and when the corresponding socket on the transmission side is actively open, the connection is established (S302). After the connection is established, if transmission data such as an operation command of the pump by the operator or the operation status of each device is input to the terminal device 2 on the transmission side, the data is transmitted to the reception side as needed. Then, when the connection is established, it is determined whether or not the transmission data has been transmitted (S303), and when the transmission data has been transmitted, the transmission data is received (S30).
4). Upon receiving the transmission data, it is determined whether or not to continue the connection (S305). When the connection is to be terminated, the socket is closed (S306) and the transmission is terminated.

On the other hand, when transmission data is not transmitted in step S303, or when connection is continued to be established in step S305, transmission is performed from the terminal device 2 on the transmission side to monitor that the line is normal. Receive monitoring data. Since this monitoring data is transmitted at a fixed period, for example, every 30 seconds, it is determined whether the monitoring data is received at a certain time interval (for example, 30 seconds) (S307). Returning to S303, the presence or absence of the next transmission data is determined, and the transmission is continued. On the other hand, when the monitoring data is not received at regular time intervals, it waits for the monitoring data to be transmitted for a fixed time, for example, several minutes (S308). here,
When the monitoring data is received, it is determined that it is normal and the process returns to step S303 to continue the transmission. However, when it is not received, it is determined that an abnormality has occurred and the operator is notified of the occurrence of the abnormality and the socket is closed (S310). Then, the process returns to step S301 again, passively opens, requests reconnection, initializes, and starts receiving transmission data again.

As described above, in the transmission system having the abnormality monitoring function of the present invention, when monitoring data is not received for a certain period of time, it is determined that an abnormality has occurred, the line is closed once, and a reconnection is requested. .

As a result, it is possible to prevent the connection from being kept established despite the occurrence of an abnormality, so that the abnormality can be quickly detected.

Further, in the terminal device of the present invention, monitoring data is transmitted for each socket and an abnormality is monitored for each socket. Therefore, even if an abnormality occurs in only one of the sockets, the abnormality can be detected. In addition to this, it is possible to stop only the socket where an error has occurred.

Therefore, it is possible to prevent a situation in which one socket that normally transmits data is stopped due to an abnormality of one socket.

Further, in the communication between the pumping station and the treatment plant located in a remote place in the water supply business, the operator does not notice the abnormality only when actually trying to operate the equipment. An emergency operation such as an emergency stop is no longer inoperable, and no serious situations such as water cutoff, water supply stoppage, rainwater flooding, and treatment plant flooding are prevented.

A program for realizing each process of the terminal device having the above-described abnormality monitoring function can be stored in a recording medium, and the recording medium is read by a computer system to execute the program. Thus, each process of the terminal device described above can be realized while controlling the computer. Here, the recording medium includes a device capable of recording a program, such as a memory device, a magnetic disk device, and an optical disk device.

[0048]

As described above, the transmission system having the abnormality monitoring function according to the present invention, the terminal device having the abnormality monitoring function, and the recording medium storing the processing program in the terminal device having the abnormality monitoring function according to the present invention. Sends and receives monitoring data at a fixed cycle, and if this monitoring data cannot be sent and received for a certain period of time, it determines that an error has occurred and closes the corresponding socket to establish a reconnection. It is possible to prevent a connection from being established without noticing that the connection is established.

As a result, it is possible to quickly detect a line abnormality and prevent a terminal device from falling into a non-response state in which it does not operate.

Further, since monitoring data is transmitted and received for each socket and an abnormality is monitored for each socket, it is not necessary to provide a dedicated socket for monitoring a line failure, and all the lines become abnormal. Even if a failure occurs such that only one socket becomes abnormal, the abnormality can be detected. Further, since the abnormality is monitored for each socket, even when an abnormality occurs in one socket, it is not necessary to stop other normally transmitting sockets.

When the transmission system of the present invention is used for communication between a remote pumping station and a treatment plant in a water supply business, it is only when an operator actually tries to operate the equipment. Since no abnormality is noticed, emergency operations such as emergency stop of the pump will not become inoperable, and serious situations such as water cutoff, water supply stoppage, rainwater flooding, and treatment plant flooding may be caused. Sex has gone.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an embodiment of a transmission system having an abnormality monitoring function according to the present invention.

FIG. 2 is a flowchart for explaining a process of a transmission-side terminal device of the transmission system having the abnormality monitoring function of the present invention.

FIG. 3 is a flowchart for explaining processing of a receiving-side terminal device of the transmission system having the abnormality monitoring function of the present invention.

FIG. 4 is a block diagram for explaining transmission between a treatment plant and a pumping station in a water supply business using a conventional transmission system.

FIG. 5 is a flowchart for explaining processing of a transmission-side terminal device of a conventional transmission system.

FIG. 6 is a flowchart for explaining processing of a receiving terminal device of a conventional transmission system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 101 Transmission system 2, 3 Terminal device 4, 7, Transceiver cable 5, 8, Transceiver 6, Ethernet coaxial cable 102 Processing plant 103 Monitoring device 104, 107 PLC 105 Pump station 106 Pump 108 Transmission line

Continuation of the front page (51) Int.Cl. ⁷ Identification code FI Theme coat II (reference) H04Q 9/00 311 H04L 11/00 310D 13/00 313 F term (reference) 5K033 AA05 BA08 CB03 DA01 DB14 EA01 EA05 EB08 EC01 5K035 AA03 CC08 CC10 DD01 FF04 GG01 JJ03 LL07 MM06 5K042 AA01 AA08 CA05 DA18 DA35 EA02 EA09 EA10 FA14 FA15 LA11 NA02 5K048 BA30 DA05 DC07 FA07 FC01 GB05 GB10 HA01 HA02 5K101 KK13 LL01 LL05

Claims (3)

[Claims] 1. An abnormality monitoring function is provided for connecting terminal devices equipped with a TCP / IP protocol via a LAN, and monitoring abnormalities when transmitting and receiving transmission data by socket communication between the terminal devices. A transmission system, wherein the transmission data and the monitoring data transmitted at a constant cycle for monitoring an abnormality are transmitted for each socket, and when the monitoring data cannot be transmitted for a predetermined time, the transmission data cannot be transmitted. First to close and initialize the socket
A transmission path for transmitting the transmission data and the monitoring data transmitted by the first terminal apparatus; and receiving the transmission data and the monitoring data transmitted by the transmission path for each socket. And a second terminal device that closes and then initializes a socket that has not received the monitoring data for a predetermined period of time, the transmission system having an abnormality monitoring function. . 2. Implementing the TCP / IP protocol,
A terminal device having an abnormality monitoring function for monitoring an abnormality when transmitting and receiving transmission data by socket communication with another terminal device connected by an AN, wherein the transmission data is transmitted to the other terminal device. When transmitting, the transmission data is transmitted, and monitoring data for monitoring an abnormality is transmitted for each socket at a fixed cycle, and when the monitoring data cannot be transmitted for a predetermined time, the socket that cannot be transmitted is closed. When receiving transmission data from the other terminal device,
While receiving the transmission data, receive the monitoring data transmitted from the other terminal device at a constant cycle for each socket, and when the monitoring data has not been received for a predetermined time, close the socket that has not been received. A terminal device provided with an abnormality monitoring function, wherein the terminal device is initialized after waiting. 3. Implementing the TCP / IP protocol, and
A recording medium recording a processing program in a terminal device having an abnormality monitoring function for monitoring an abnormality when transmitting and receiving transmission data by socket communication with another terminal device connected by an AN, wherein the transmission data When transmitting to the other terminal device, a process of transmitting the transmission data, a process of transmitting monitoring data for monitoring an abnormality for each socket at a fixed cycle, and the monitoring data cannot be transmitted for a certain period of time. When the transmission data is received from the other terminal device, the process includes receiving the transmission data, and performing a process of receiving the transmission data from the other terminal device. Receiving the monitoring data transmitted in a cycle of every socket, and when the monitoring data has not been received for a certain period of time. Recording medium storing a processing program in the terminal device having the abnormality monitoring functions, which comprises a process of initializing after closing the not received socket.