JPH0584117B2 - - Google Patents

Description

[Detailed description of the invention]

[Technical Field] The present invention relates to a remote monitoring and control system configured to transfer data using time division multiplex transmission. [Background Art] In a conventional system of this type, as shown in FIG. Input data to the input terminal 2
Remote monitoring and control has been performed by outputting to the output terminal 3 having an address corresponding to the address. In addition, in order to increase the response speed of remote monitoring control in such a system, when the state of the input terminal of the input terminal device 2 is closed, the constant monitoring operation of the base unit 1 is interrupted and the input change is detected. The hot input terminal device 2 is monitored with priority, and when the input data is output to the output terminal device 3, an interrupt operation is performed. In such a conventional system that simply outputs the state data of the input terminal of the input terminal 2 to the corresponding output terminal, when trying to perform push-on/push-off type supervisory control, for example, the input terminal 2 An external latch device must be added to the input terminal section of the terminal, and even if there is a function that can monitor the latch status, it is necessary to determine which input terminal device 2 to monitor the status data from, and to monitor the latch data. In order to distinguish between the status data type and the latch data type, it is necessary to limit the state data type or latch data type by address in advance, or to create a correspondence table on base unit 1.If the address is limited,
There is a problem that the system is inferior in versatility and extensibility, and when a correspondence table is used, there is a problem that it is necessary to rewrite the correspondence table of the base unit 1 when changing the system. By the way, a supplementary explanation will be given regarding the above-mentioned terms "state data" and "latch data". JP-A-58-198996, which belongs to the technical field of the present application and was published before the application of the present application and has already become a well-known technology, describes the following. In other words, when there is a change in the monitoring input on the terminal side, this is detected and the monitoring data is sent back to the central control unit, and the monitoring input is determined by a switch operation or a sensor output. Are listed. The sensor detects a detected object, for example, a human body, in a certain monitoring area, so data indicating whether or not the detected object is detected in the monitoring area is input to the terminal side. I will do it. In addition, the switch operation is a switch that controls the blinking of a load, such as a lighting load. Therefore, data on whether the switch is turned on or turned off is required, and this data is latched and input to the terminal device. I will do it. Therefore, the data to which the switch operation or monitoring input such as sensor output described in the above-mentioned Japanese Patent Application Laid-Open No. 1989-1989 is input is latched data obtained by latching the contents of the switch operation, and also the monitoring input from the sensor. Data that detects the state of an area is state data, and these touch data and state data correspond to the "latch data" and "state data" of the present application. [Object of the Invention] The present invention allocates one bit of input data of an input terminal device as a status for determining whether the input data of the input terminal device is a state data type or a latch data type, and the parent device reads this status and determines the state. By being able to distinguish between data type and latch data type, it has excellent versatility and extensibility.Moreover, the main unit software is simple and does not need to be changed for each system, and it can be used to distinguish between state data and latch data. The object of the present invention is to provide a remote monitoring and control system that enables monitoring and control. [Disclosure of the Invention] Examples of the present invention will be described below with reference to the drawings. As mentioned above, the status data described below is, for example, data from a sensor, and is input level data of the input terminal of the input terminal device 2. Further, the latch data is, for example, data from a switch, and is change point data that indicates that the input level of the input terminal of the input terminal device 2 has changed.
When the input data I ₁ to I ₄ of the input terminal 2 is transferred to the output terminal 3 and output as output data O ₁ to O ₄ , one bit is input to the input of the input terminal 2 as shown in FIG. A terminal corresponding to the status S of is added, and depending on the state of the status S, it is possible to change whether the data to be transferred and output to the output terminal 3 is input state data or input latch data. . As an example, if the status S is "0", the input status data is transferred to the output terminal 3, and when the status S is "0", the input data I ₁ to I ₄ are transferred as shown in Table 1. When the input status data that matches the output data O ₁ to O ₄ is transferred and output, and the status S is “1”, only for the input data I ₃ where the input data change has occurred as shown in Table 2, Data “1”
Data is transferred so that the output data
By setting only _O3 to "1", input latch data can be transferred and output. Here, in the case of Table 1, only the output data _I3 has changed, but "0111" of the input data _I1 to _I4
The reason for this is that the state data is the state of the monitoring area detected by the sensor, so it is necessary to transfer the data as it is in the detected state as output. In addition, in the case of Table 2, only the input data I ₃ has changed, and instead of transmitting "0111" of input data I ₁ to I ₄ like the state data in Table 1, "0010" is transmitted. The reason for this is that in latch data, only changes caused by the operation of a certain switch need to be determined, so only the input data that has changed needs to be set to "1" and the data transferred.

【table】

〔Effect of the invention〕

As described above, the present invention assigns one bit of the input data of an input terminal device as a status for determining whether the input data of the input terminal device is a state data type or a latch data type, and when transferring data. The parent device determines the status and outputs the status data, which is the input level data of the input terminal of the input terminal, to the corresponding output terminal, or the input level of the input terminal of the input terminal changes. Since the latch data of the input terminal, which is the change point data that informs the change, is determined whether to be output to the output terminal and the data is transferred, monitoring and control is performed not only by the input status data but also by the input latch data. This has the effect of making it possible to construct a remote monitoring and control system that can be used with a light burden on the software of the base unit and has excellent versatility and expandability.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a conventional example, Fig. 2 is a block diagram of an embodiment of the present invention, and Fig. 3 is a flowchart of the same main unit, where 1 is a main unit, 2 is an input terminal, and 3 is a block diagram of an embodiment of the present invention. Output terminal, I ₁ ~ _{I 4} are input data, O ₁ ~
O ₄ is output data and S is status.

Claims (1)

[Claims] 1 In a remote monitoring and control system configured to output data input from one terminal device to the other terminal device via a base device using time division multiplex transmission, one of the input data of the input terminal device is A bit is assigned as a status that determines whether the input data of the input terminal is a state data type or a latch data type, and when transferring data, the base unit determines the status and selects the input data of that input terminal. Either output the state data, which is the input level data of the terminal, to the corresponding output terminal as is, or output the latch data of the input terminal, which is the change point data that indicates that the input level of the input terminal of the input terminal has changed. What is claimed is: 1. A remote monitoring and control system that determines whether to output data to a computer and then transfers the data.