JPS63132597A - Multiplex transmission control equipment for plant control system - Google Patents

Abstract

PURPOSE:To remarkably curtail a cable and also to execute an appropriate backup by a manual control system in case a abnormality is generated in an automatic control system by providing an input signal use part and an output signal use part on a multiplex transmission part placed in a job side and providing the automatic control system and the manual control system as a transmission system. CONSTITUTION:Input signals dispersed in a job site are inputted to the nearest multiplex transmission with a manual control, respectively, and all the same data in an automatic system and a manual system are sent to a controller of a central operating room. As for the controller of this central operating room, in case of the automatic system, a necessary arithmetic operation is executed by automatic controllers CTLA1-CTLAn, and by a transmission line of the automatic system, a signal is sent to a multiplex transmission device with a manual control (RTU) of the job site. In case of the manual system, a necessary arithmetic operation for the manual control is executed by a manual controller CTLH, and displayed on a station. By operating signals from stations STA, STD, an arithmetic operation is executed by the manual controller CTLH, and its result is sent to the RTU of the job site. The RTU of the job site inputs an output of the automatic system and an output of the manual system, selects whether it is automatic or manual, by signal selecting circuits SE1, SE2 and outputs it.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a multiplex transmission control device for a plant such as a thermal or nuclear power plant, and in particular, the automatic control system is separated into an automatic control system and a manual control system. The present invention relates to a multiplex transmission control device for a plant control system that allows bank amplifier operation to be performed appropriately in a manual control system even if some kind of redundancy occurs in the plant control system.

[Conventional technology]

In the conventional example, for example, the one shown in "Functional Hierarchical Autonomous System Equipment Unit Distributed System" (Hitachi Hyoron J June 1986 issue), the automatic system is a transmission line,
The manual system was connected by cable.

[Problem that the invention seeks to solve]

At a thermal or nuclear power plant, on-site and central operation r+! ff
When attempting to rationalize the entire plant by reducing the number of cable connections in the system by multiplexing transmission, it is necessary to multiplex the manual system. In this case, it is inappropriate to put the automatic control system and the manual control system on the same transmission system from the standpoint of manual backup.

Furthermore, the field input signals and control number 48 are not located at the same location, but are distributed throughout the building.

The input signals required for the controlled object must be obtained from various locations.

That is, the minimum input/output signals required for manual control are distributed within the building, and simply installing a manual operation card at the site will not reduce the amount of cables.

An object of the present invention is to provide a multiplex transmission device for a plant control system that enables manual operation in a manual system even if there is an abnormality in the automatic control system.

[Means for solving problems]

The present invention provides a dedicated transmission line for manual control,
Even if the input signals and output signals necessary for the control system are distributed within the building, this problem is attempted to be solved by providing a multiplex transmission section at the site.

The multiplex transmission section installed at the site has one for input signals and one for output signals, and by providing an automatic control system and a manual control system as transmission systems, it is possible to construct an optimal transmission network that minimizes cables. It becomes possible.

[Effect]

In the present invention, an input signal is input to an automatic system buffer and a manual system buffer, and the same data is sent to an automatic system transmission line and a manual system transmission line, and the output signal is
The automatic system and manual system each have registers, and a signal selection circuit can be used to switch between the automatic system and manual system, making it possible to perform manual operation using the manual system even if the control of the automatic system becomes abnormal. That is.

〔Example〕

An embodiment of the invention is shown in FIGS. 1 and 2.

Figure 1 shows a manually controlled multiplex transmission unit RT installed on site.
U 1 ” RT U, and the automatic system controller CT L Al-CT LA installed in the central operation room.
l1, and an analog station ST^, which is an interface between the manual system controller CTLH and the manual system controller, and a digital station ST.

It is made up of.

Figure 2 shows the internal circuit of the manual control multiplex transmission unit RTU, which includes the automatic transmission device UD^ and the manual transmission device U.
It is composed of a DH, an analog input section AI, a digital input section DI, an analog output section A○, and a digital output section Do. Automatic system buffer BF in input section AI and DI
It has a manual system buffer BFH and an input signal is written as the same information to the automatic system and manual system. Output part AO
, Do contains automatic system register RT^ and manual system register R.
Control signals for automatic system and manual system are stored in respective registers. These signals are selected to be automatic or manual by signal selection circuits SE1 to SEz, and the selected signals are output. Other AD converters AD, D
It has an A converter DA. It has a multiplexer MPX and a demultiplexer DMPX.

That is, the input signals distributed at the site are each taken into the nearest manually controlled multiplex transmission unit RTU, and the exact same data is sent to the controller of the central operation system for the automatic system and the manual system.

In the case of an automated system, the central control controller executes the necessary calculations and sends a signal to the manually controlled multiplex transmission equipment on site via the automated system's transmission line.

For the manual system, manual controller C performs the calculations necessary for manual control.
TLo executes and displays on the station. Based on the operation signal from the station, the manual controller CTLH performs calculations and sends the results to the multiplex transmission section with manual control at the site.

The multiplex transmission section with manual control at the site takes in the output of the automatic system and the output of the manual system, and selects either automatic or manual output using the signal selection circuit.

Another embodiment of the invention is shown in FIGS. 3 and 4.

FIG. 3 shows an analog input section, and FIG. 4 shows a digital input section.

FIG. 5 shows the amount of information in this embodiment.

In FIG. 3, among the input analog signal amounts, some are used for the automatic system, some are used for the manual system, and some are used for both the automatic system and the manual system. When this signal is written as data to the file memories FM^ and FMH by the timing circuit TIM, information necessary for the automatic system and the manual system, and also for both, is selected by ON/OFF control of the gate circuits G^ and G11. .

Figure 4 shows the digital input section, which is the same as the analog input section.5 In this way, by providing a gate circuit, it is possible to select between automatic system and manual system, reducing the amount of information and increasing efficiency. transmission can be carried out.

In one embodiment of the present invention, a wire is used for the multiplex transmission device, but the same is true for optical multiplex transmission. Furthermore,
Although the automatic control system is a single system, it is the same even if it has a multiple system configuration such as a double system or a triple system. Furthermore, the station is also the same with CRT touch operation.

Further, the input/output card can be not only analog or digital but also special input/output devices such as pulse type.

〔Effect of the invention〕

According to the multiplex transmission device according to the present invention, the number of cables can be significantly reduced, resulting in great economical effects.

Furthermore, by dividing the manual control system and automatic control system,
Even in the unlikely event that an abnormality occurs in the automatic control system, the 5-manual control system allows for appropriate backup, which greatly improves reliability.

[Brief explanation of the drawing]

Fig. 1 is a side view of the overall configuration of the present invention, Fig. 2 is a detailed block diagram of a multiplex transmission device with manual control, Fig. 3 is an embodiment of the analog input section, and Fig. 4 is a diagram of the digital input section, Figure 5 is a time chart. RT U t~,...Multiple transmission equipment with manual control, CT
L^1~n...Automatic system controller, CTLI (...
・Manual controller.

Claims (1)

[Claims] 1. An automatic system controller, a manual system controller, a multiplex transmission unit provided at a plant site terminal, and a system for providing transmission between the multiplex transmission unit, the automatic system controller, and the manual system controller. A multiplex transmission control device for a plant control system, comprising a transmission line, and the multiplex transmission section is divided into an automatic system and a manual system. 2. The multiplex transmission control device for a plant control system as set forth in claim 1, wherein the input acquisition section in the multiplex transmission control section has separate buffers for the automatic system and the manual system, respectively. 3. The multiplex transmission control device for a plant control system according to claim 1, wherein the output section of the multiplex transmission control section has individual registers and signal selection circuits for the automatic system and the manual system, respectively. .