JPH0417424A - State monitoring device for network communication - Google Patents

Abstract

PURPOSE:To make proper discrimination by an operator and its repairing processing quick by allowing a terminal detection section including a MODEM error discrimination circuit and a synchronization establishment discrimination circuit to display visually a data transmission communication state. CONSTITUTION:A MODEM error discrimination circuit 16 outputs a MODEM error signal to an alarming section 18 when the circuit 16 discriminates a MODEM to be in error due to a signal from the MODEM 6. A synchronization establishment discrimination circuit 19 monitors a reception data signal discriminated not to be in error by the MODEM error discrimination circuit 16 and outputs the result to a reception discrimination circuit 20. The reception discrimination circuit 20 discriminates whether a start signal comes from its own station or is a starting signal to other station. In the case of the starting signal to other station, the signal is sent to other station via an other-station start circuit 21. When the signal comes from its own station, a timer 23 issues an alarm when a starting reception signal 22 is generated at the outside of a setting time and displays synchronization establishment when the signal is generated within the setting time. Thus, a terminal control section 10 indicates clearly the data communication state by a network and the operator applies quick and proper discrimination and repair in a short time.

Description

Detailed Description of the Invention [Objective of the Invention] (Industrial Application Field) The present invention provides a distributed data recording and monitoring system using a network applied to distributed hierarchical plant control. The present invention relates to a network communication status monitoring device for monitoring the data communication status of a simplified data processing device connected via a network.

(Prior Art) Conventionally, simple data processing devices arranged in a distributed hierarchy and connected to a network are unable to transmit data or communicate via the network due to program stoppage, failure, etc. The function to detect and display was inadequate. Therefore, the operator or maintenance worker of the simple data processing device cannot clearly determine the cause of data transmission/communication failure, leading to stagnation of data processing operations and reduction in data transmission/communication efficiency.

(Problems to be Solved by the Invention) An object of the present invention is to clarify the state of data communication through a network in a distributed hierarchical data recording/monitoring system so that operators and maintenance workers of a simple data processing device can quickly This enables accurate judgment and quick repair. We also provide network communication status monitoring equipment that aims to reduce problems caused by communication failures in data communication and data transmission, and improve the operating efficiency of data processing, analysis, and storage operations through data transmission. It's about doing.

[Structure of the invention]

(Means for Solving the Problems) The network communication status monitoring device of the present invention is a distributed data recording/monitoring device in which a central plant data recording/monitoring processing device and a simplified data processing device are interconnected via a network. It is applied to the system, and includes a modem error judgment circuit, a synchronization establishment judgment circuit, a reception judgment circuit, and an other station activation circuit that monitor plant transmission data on the network and detect the communication status on the network from the contents of the transmission data. A terminal detection unit is provided, which includes a timer.

(Function) Confirms the data transmission/communication status, the control status of the simple data processing device of the local station, checks the modem status, and visually displays the data transmission/communication status.

(Example) Examples of the present invention will be described below with reference to FIGS. 1, 2, and 3.

Figure 1 shows a distributed data recording/monitoring system configured online using a network.

A central plant data recording/monitoring processing device 1 and several simple data processing devices 2, 3, 4. ... are connected to a plurality of modems 6.7, 8. on the network 5. ... to form a distributed data recording and monitoring system.

The central plant data recording/monitoring processing device 1 includes a modem 6,
A plurality of simplified data processing devices 2, 3, 4 . ···It is connected to the. The central plant data recording/monitoring processing device 1 issues data reception requests equally, and each simple data processing device 2, 3, 4 .・Receive plant data indicating each plant status sent from
Performs certain processing and stores or outputs the resulting output and data.

FIG. 2 shows the configuration of the simplified data processing device 2, and the other simplified data processing devices 3, 4, . . . are also similar.

The simple data processing device 2 includes a network communication control section 9,
Terminal control unit 10, engineering/○ interface unit 11, arithmetic control unit 12, main storage unit 13, CRT 14, hard copy 1
It consists of 5. The data of the plant signal 16 input from the I10 interface section 11 is sent to the arithmetic control section 12.
and is read by the i-uncontrolled unit 10.

The plant data read by the terminal control section 10 is edited according to the communication procedure of the network communication control section 9, and then transmitted to the central plant recording/monitoring processing device 1 via the modem 6 and network 5.

Further, the plant data read by the terminal control unit 10 is stored in the main storage unit 13 as plant data. Furthermore, the plant data read into the CRT 14 is displayed or output to the hard copy 15. Conversely, the results processed by the central plant recording/monitoring processing device 1 are sent to the CR by the terminal control section 10 through the network communication control section 9.
Displayed on T14.

The simple data processing device 2 also includes a network 5,
It also has a function of displaying the data status on the CRT 14 as the terminal status in the terminal control unit 10 using the signal data input via the modem 6 and the plant signal 16 via the ■/○ interface 11. .

FIG. 3 shows the configuration of the terminal control section 10 of the simplified data processing bag W2 of the present invention.

The modem error determination circuit 16 monitors the signal from the modem 6 and, when determined to be abnormal, generates a modem error signal 17 and outputs it to the alarm section 18. The synchronization establishment determination circuit 19 monitors the received data signal determined not to be an error by the modem error determination circuit 16 and outputs it to the reception determination circuit 20 . The reception determination circuit 20 determines whether the activation signal is from the own station or to another station.

In the case of an activation signal for another station, it is transmitted to the other station via the other station activation circuit 21 and the modem 6.

When it is determined that the own station has started, it transmits a start reception signal 22 and outputs it to the timer 23.

In the timer 23, the timer setting can be arbitrarily performed externally using a program, etc., and when the activation reception signal 22 is not generated within the set time, it is determined that the activation reception signal 22 is abnormal as a time-over and output to the alarm unit 18. do.

If the activation reception signal 22 is within the setting of the timer 23, it is assumed that the local station has activated and synchronization has been established, and a synchronization establishment signal 24 is generated, stored in the main storage section 13, and displayed on the CRT 14. The status of the modem error signal 17 and the status of the time-over signal of the alarm unit 18 are displayed on the CRT 14 in the operator message area.

According to this embodiment in such a terminal control unit 10,
Data communication status in a network can be easily identified.

That is, ■ The data signal received via the modem is transmitted to the CRT14.
When it is not displayed, it indicates whether data communication via the network is possible or is in progress.

Q> When the modem error signal is displayed, the modem 6
This indicates that the status of the modem 6 is out of order, the power is off, or the connection between the modem 6 and the network is poor.

■ When a time-over signal is generated, it indicates that the local station activation state in the terminal control unit 10 is not possible due to some reason, that is, a malfunction in the simple data processing device. The station's simple data processing equipment is in an inoperable state.

〔Effect of the invention〕

As described above, according to the present invention, an input/output terminal operator and a maintenance worker of a simple data processing device can visually determine the data communication status of a network, and can also make a primary diagnosis of early morning failures when a network abnormality occurs. This is a network communication status monitoring device that enables secondary diagnosis and configures an online system with high availability.

[Brief explanation of drawings]

Figure 1 is an online system configuration diagram of a network in distributed data recording and monitoring according to the present invention.
FIG. 3 is a block diagram of a simplified data processing apparatus according to the present invention, and FIG. 3 is a block diagram of a terminal control section according to the present invention. 1...Central plant recording/monitoring processing device 2-4...
Simple data processing device 5...Network networks 6-8...Modem 9...Network communication control section 10...Terminal control section 11...I10 interface section 12...Arithmetic control section 13. ...Main storage section 14...CRT 15...Hard copy 16...Modem error judgment circuit 17...Modem error signal 18...Alarm section 19...Synchronization establishment judgment circuit 20...Reception Judgment circuit 21...Other station starting circuit 22...Starting reception signal 23...Timer 24...Synchronization establishment signal Agent Patent attorney Noriyuki Chika Diagram

Claims (1)

[Claims] A data communication system consisting of a network and modem, and a distributed data recording/monitoring system consisting of a central plant data recording/monitoring processing device and a simplified data processing device, which monitors plant transmission data on the network. A terminal detection section is provided, which is composed of a modem error judgment circuit, a synchronization establishment judgment circuit, a reception judgment circuit, another station activation circuit, and a timer, which detects the communication status on the network from the contents of the transmitted data. A network communication status monitoring device characterized by checking the status and control status of a simple data processing device of its own station, detecting the modem status, and visually displaying the data transmission/communication status.