JPS6356042A - Self-diagnosing method for data transmission - Google Patents

Abstract

PURPOSE:To diagnose the data transmission function of a transmission section by installing one optical fiber between the transmission terminal and the reception terminal of a transmission section, connecting them, sending a prescribed data from a sending side and receiving it at a reception side and checking whether or not both the data are coincident. CONSTITUTION:The transmission/reception terminals 8, 9 of the transmission section 1 are connected by one optical fiber 10 and a switch SW1 is switched to the position of a self-diagnosing mode. A signal processing section 3 reads a program to apply the self-diagnosis from a ROM memory 4 and executes it. No signal is sent from the transmission side of the section 1 at first and the reception side of the section 1 is subjected to a normal reception. When any data is received by the reception side, a display section 6 is lighted to inform the presence of abnormity. In sending a prescribed data from the sender side, the transmission signal is received by the reception side and when the transmission/reception data are not coincident, since it represents the presence of a fault in the section 1, the display section 6 is lighted to display the fault.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a data transmission self-diagnosis method for a sequence controller that sequentially controls the operation of equipment according to a predetermined program.

[Background technology 1 Today, R' controlled by a sequence controller
With the development of J5 IL, the 8th year of high school students will learn about equipment control systems using sequence controllers! The system is now being made more efficient. FIG. 4 shows a device control system using such a highly functional sequence controller. This equipment control system consists of multiple sequence controllers A
and a computer B such as a personal computer that collectively controls these sequence controllers A, and each sequence controller A is equipped with a transmission section 1 that performs secret data transmission with other sequence controllers A or computer B. Each of the sequence controllers A or 78 computers is connected by an optical fiber 10, and data is transmitted by the transmission section 1 via the optical fiber 10.

Conventionally, when a user diagnoses the data transmission function of such sequence controller A (7) transmission fflSi,
The transmission units 1 of a plurality of sequence controllers A are connected by optical 7-eyeper 10, and data transmission such as sending and receiving test commands is performed in the dark on each sequence controller A, thereby diagnosing the data transmission function.

However, in the data transmission diagnosis method as described above, when a failure occurs in the system, it is not possible to diagnose each transmission unit 1 individually, and therefore there is a problem in that it takes too much time to diagnose the failure.

[Objective of the Invention 1 The present invention has been made in view of the above-mentioned points, and its object is to provide data that can easily and quickly diagnose abnormalities in the transmission section of a sequence controller. The purpose is to provide a method for self-diagnosis of evangelism.

[Disclosure of the Invention] (Configuration) The present invention includes a plurality of sequence controllers that sequentially control the operation of devices according to a predetermined program, and a computer that collectively controls the sequence controllers. In an equipment control system in which data is transmitted by transmitting and receiving optical signals by connecting the above-mentioned sequence controllers using optical fibers, the transmission terminal and the reception terminal to which the optical fiber of the transmission unit that transmits data of the sequence controller is connected are connected to one wire. The transmitting side of the transmission section transmits predetermined data using an optical fiber, and the receiving side of the transmission section receives this transmission signal. The data transmission function of the transmission section of each sequence controller is diagnosed by determining whether or not it is normal.

(Embodiment) Figures 1 to 3 are diagrams showing an embodiment of the present invention.
In the sequence controller A of this embodiment, as shown in the tIS1 diagram, the transmission unit 1 that transmits and receives optical signals via the optical fiber 10 connected to another sequence controller A or computer B is connected to the transmitting signal and the receiving signal. a photoelectric converter 2 that photoelectrically converts the data, and a CP that receives data transmitted from, for example, computer B in the case of normal data transmission and transmits a transmission signal based on this received signal.
A signal processing unit 3 consisting of U, and a 110M memory 4 used for signal processing performed by this signal processing unit 3, or R
With AM memory 5, it has become obsolete. Note that communication between the signal processing section 3 and the photoelectric converter 2 is performed using serial signals. Furthermore, in this embodiment, the normal data transmission M mode performed with the above-mentioned sequence controller A IJI or computer B, and the data transmission 8! of the transmission section 1 of each sequence controller A! A switch SW1 is provided for switching between a self-diagnosis mode and a self-diagnosis mode for diagnosing the function.
Connected to 2. When this switch SWl is operated to switch to the self-diagnosis mode side, the signal processing section 3
A predetermined program stored in the M memory 4 is executed to diagnose the data transmission function of the transmission section 1. In addition, a judgment display as to whether the data transmission function of the transmission unit 1 is normal or not by executing this self-diagnosis mode is displayed at the judgment output terminal P of the signal processing g3.
This is carried out by turning on the display section 6 connected to 1 through the inverter 7. In this embodiment, a light emitting diode is used as the display section 6.

The operation of this embodiment will be explained below. First, when the sequence controller A is in the normal data transmission mode, for example, if it is transmitted from the computer B and received via the optical fiber 10, this received signal is transmitted via the charging converter 2 to the signal processing unit 3. and this f
i place j! l! The unit 3 calls and executes a normal data transmission program from the ROM memory 4 in accordance with the reception number 46. By executing this program, for example, a control signal is transmitted to another sequence controller A via the optical fiber 10, or a control signal is transmitted to a device controlled by the sequence control ty-7A. In addition,
During the normal data transmission mode programming of the above-mentioned sequence controller A, as shown on the left side of FIG.
A command to monitor the operating state of the switch SW at a certain timing is incorporated. Therefore, it is possible to switch to the self-diagnosis mode even during program execution in the normal data transmission mode.

Next, a case will be described in which the switch SW1 is switched to the self-diagnosis mode. At this time, as shown in FIG. Connect across the board. In addition, in order to ensure self-diagnosis,
It is confirmed in advance that the optical fiber 10 used in this case is normal. And this optical fiber 10
After connecting, switch SW1 to self-diagnosis mode. By switching this switch SWl, the signal processing section 3
reads out a program for self-diagnosis from the ROM memory 4 and executes it.

This self-diagnosis method will be explained below with reference to FIG. First, no signal is transmitted from the transmission side of the transmission section 1, and the receiving MgA of the transmission s1 is operated normally. At this time, it is determined whether any data has been received on the receiving side. Since the receiving side may perform abnormal reception operations depending on the timing, this program is repeated an appropriate number of times6.And when the receiving side receives some data, the receiving side of the transmitter 1 Since there is an abnormality such as a river, in this case, the display section 6 is turned on to inform the user of the abnormality C). By executing this program, it is possible to first check whether there is any abnormality on the receiving side of the transmitter 1. Then, when it is confirmed that there is no abnormality on the receiving side, the next program is executed. In this case, send MIl! In addition to transmitting the specified data from
This transmission signal is received by the receiving cylinder, and it is determined whether the data transmitted from the transmitting side is correctly received by the receiving side. In other words, when the transmitted and received data match, the transmitter 1
is found to be normal. If the transmitted and received data do not match, there is an abnormality in the transmitting section 1, and the display section 6
lights up to indicate an abnormality.

Then, when this program is finished, the above switch SW
1 is switched to normal data transmission mode, it returns to data transmission mode. 3. If the switch SW1 is left as it is, the above operation is repeated. In this way, the optical fiber 1 is connected to the transmission/reception terminal 8.9 of the transmission section 1.
By connecting 0 across and switching the switch SW1, the signal processing section 3 executes a self-diagnosis program stored in the ROM memory 4, so that each sequence controller 8 is connected to its own transmission section 1. It is possible to diagnose whether there is an abnormality or not, and with this simple operation it is possible to discover which sequence controller A is abnormal.
This enables quick response to failures. Furthermore, it is also possible to check for an abnormality in the optical 7T IP address 10 using the transmission section 1 that is determined to be normal by the above self-diagnosis.

[Effects of the Invention] As described above, the present invention connects 43 transmitting/receiving terminals to which optical fibers are connected to the predetermined sequence controller of the transmitting section of the sequence controller using one optical fiber, It transmits predetermined data from its own transmitting side, receives this predetermined data on its own receiving side, and determines whether the transmitter is normal based on whether the transmitted data and the received (IT) data match. This allows the sequence controller 1n unit to diagnose whether its own transmission section is normal or not, and since it is easy to operate, the user can also perform the diagnosis, and can quickly respond to failures. Make the most of your efforts.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram of an embodiment of the present invention, Fig. 2 is an explanatory diagram showing the state in which an optical fiber is connected to the transmitting/receiving terminal of the transmission section for self-diagnosis of the above, and Fig. 3 is an illustration of the operation of the same. Show 70
-Chart, fltJ4 diagram is a configuration diagram of the entire system same as above. A is a sequence controller, 1 is a transmission section, and 10 is an optical fiber. Agent Patent Attorney Ishi 1) Chief Figure 7 4

Claims (2)

[Claims] (1) A plurality of sequence controllers that sequentially control the operation of devices according to a predetermined program are provided, and a computer is provided that collectively controls the sequence controllers, and a predetermined sequence controller;
Alternatively, in an equipment control system that connects a computer with an optical fiber and transmits and receives optical signals to transmit data, the transmission terminal and the reception terminal to which the optical fiber of the transmission unit that transmits data from the sequence controller is connected. A single optical fiber is connected across the board, and the transmitting side of the transmission unit transmits specified data, and the receiving side of the transmission unit receives this transmitted signal, and determines whether the transmitted data and received data match. A data transmission self-diagnosis method characterized by determining whether or not a transmission section is normal. (2) The transmitting side does not transmit any data, and the receiving side determines whether any data has been received at this time,
2. The data transmission self-diagnosis method according to claim 1, wherein the method comprises determining whether or not only the receiving side of the transmitting section is normal.