CN202120103U - Distributed control system used for production process automation - Google Patents

Abstract

The utility model discloses a collection and distribution control system for production process automation, comprising: a field control level, a process control level and a process monitoring level; the field control level includes a field control device; the process control level includes a standard The input and output board is the controller connected with the standard input and output board; the process monitoring level includes the operation station, the management machine and the monitoring machine connected together through the communication network; wherein, the controller and the operation station are connected together. The system is a multi-level computer system composed of process control level and process monitoring level with communication network as the link. It integrates 4C technology, realizes the automation of production process, saves human resources, improves production efficiency and reduces production cost; Remote monitoring and network management are convenient for installation, commissioning and maintenance. And it has the advantages of high cost performance, simple use, easy expansion, etc., and is convenient for secondary development.

Description

Distributed Control System for Production Process Automation

technical field

The utility model relates to a computer control system for production process automation, in particular to a collection and distribution control system for production process automation control.

Background technique

DCS system is the abbreviation of Distributed Control System (Distributed Control System), which is generally called Distributed Control System in China. widely used.

The DCS system adopts an open, standardized, modularized and serialized design. Each computer in the system communicates with a local area network to realize information transmission. When it is necessary to change or expand the system function, the new computer can be easily connected to the system communication network. Or removed from the network, with little impact on the work of other computers in the system. The system control function is also distributed on each computer, and the system adopts a fault-tolerant design. When a computer fails, it will not cause the loss of other functions of the system. In addition, since the tasks undertaken by each computer in the system are relatively single, special-purpose computers with specific structures and software can be used for the functions that need to be realized, so that the reliability of each computer in the system is improved.

This type of system has complete control functions and rich control algorithms, integrating continuous control, sequence control and batch control, and can realize advanced control such as cascade, feedforward, decoupling, adaptive and predictive control, and can be easily added to all special control algorithm required.

The existing DCS system includes: configuration software, real-time database and operating stations and other workstations; various data are transmitted between the workstations through industrial Ethernet (HSE), and the entire system information is shared and coordinated to complete the overall function of the control system and optimized processing.

But for small and medium-sized devices (the total number of I/O points is within 500 points), the ordinary DCS system is too expensive, and the debugging and installation are complicated, and the maintenance is difficult.

Utility model content

The technical problem to be solved by the utility model is: to overcome the defects of high cost of using DCS system for small and medium-sized devices (the total number of I/O points is within 500 points), difficult system debugging, and heavy maintenance workload, and provide a time-saving, labor-saving, High-efficiency and low-cost distributed control system for production process automation.

In order to achieve the above object, the technical solution adopted by the utility model is:

The distributed control system for production process automation is characterized in that it includes: a field control level, a process control level and a process monitoring level; the field control level includes a field control device; the process control level includes a standard input and output board connected to the field control device , the controller connected with the standard input and output board; the process monitoring level includes the operation station, the management computer and the monitoring computer connected together through the communication network; among them, the controller and the operation station are connected together.

In the above technical solution, the control system is a multi-level computer system composed of the process control level and the process monitoring level with the communication network as the link, which integrates the computer (Computer), communication (Communication), display (CRT) and control (Control) )'s 4C technology, which realizes the automation of the production process, saves human resources, improves production efficiency, and reduces production costs; realizes remote monitoring, network management, and facilitates installation, commissioning and maintenance. And it has the advantages of high cost performance, simple use, easy expansion, etc., and is convenient for secondary development.

As an improvement to the above technical solution, the further technical problem to be solved by the utility model is to provide a modularized control system in which the field system and the control system are completely independent. Therefore, as a preferred technical solution of the utility model, the process control stage is a control box structure, and standard connection terminals are provided on the control box.

The components included in the process control level are integrated into an integrated design, and the signals can be received through standard terminal blocks, and all control functions can be completed, thus realizing the completely independent modular design of the field system and the control system.

As an improvement to the preferred technical solution, the utility model is further equipped with a power supply system in the control box.

This power supply system can provide all the driving power of the on-site system to form a high-reliability power supply product.

Description of drawings

Fig. 1 is the structural representation of the first embodiment of the distributed control system of the utility model for production process automation;

Fig. 2 is a schematic diagram of the control box structure of the embodiment process control stage shown in Fig. 1;

Fig. 3 is the structural representation of the second embodiment of the distributed control system of the utility model for production process automation;

Fig. 4 is a schematic structural diagram of a third embodiment of the distributed control system used in production process automation of the present invention.

Detailed ways

The utility model will be further described below in conjunction with the accompanying drawings and preferred embodiments.

Fig. 1 shows a schematic structural view of the first embodiment of the distributed control system used for production process automation of the present invention. As shown in the figure, the system of this embodiment includes: a field control level, a process control level and a process monitoring level.

The on-site control level includes on-site control devices;

The process control level includes standard input and output boards (I/O boards) connected to field control devices, and controllers connected to standard input and output boards;

The process monitoring level includes the operation station, management machine and monitoring machine connected together through the communication network.

Among them, the controller is connected with the operation station.

The I/O board mainly completes the conversion of input analog and digital signals (A/D and D/A conversion); the controller is the core component of the process control level. In this embodiment, the controller uses a PID controller, Its task is to complete the process control with PID as the main function, and the user writes an application program based on "configuration" to realize the control requirements.

In this system, all kinds of signals (temperature, various electrical signals, flow, displacement, composition, pressure, etc.) are collected through the on-site control device, and sent to the controller through the I/O board, and the controller completes the set adjustment rule After the calculation, it is fed back to the I/O board to output and convert the signals required by various on-site equipment (lighting, sound and light alarms, fans, refrigeration units, various valves, water pumps, air conditioners, etc.), and through the on-site control device. automatic control.

The process monitoring level is a platform for operators to exchange information with DCS. It is the core display, operation and management device of DCS. The operator monitors and controls the production process through the operation station, and can understand the production operation status and the number and status of each process variable through the screen. And according to the needs, manual and automatic switching, modification of setting values, adjustment of control signals, manipulation of field equipment and other operations can be performed through the operation station at any time to realize the control of the production process.

As a preferred mode of this embodiment, the process control level is a control box structure, realizing a modularized control system completely independent of the field system and the control system. The on-site system refers to the process control level and the on-site control level, and the control system refers to the process monitoring level. Standard terminal blocks (not shown) are provided on the control box. The components in the control box are connected to the outside world through standard wiring terminals, so all control functions can be completed only by receiving the control instructions from the upper operating station through the standard wiring terminals, and this standard signal interface can make the on-site system and the user choose their own Other DCS systems, PLC systems, DDC systems, etc. are conveniently connected, and even the system composed of the user's own single-chip microcomputer can control the field system, which has good compatibility and greatly improves the user's choice.

At the same time, the power supply system is also integrated in the control box, which can provide all the driving power of the on-site system, forming a highly reliable power supply product.

The second embodiment of the utility model is an improvement on the first embodiment. As shown in Figure 3, the I/O board and the controller are connected through a data bus. In this way, the signal anti-interference system can be connected to the data bus. After the various signals collected by the field control device are sent to the I/O board, after the information compensation and linearization of the signal anti-interference system, they are sent to the I/O board through the data bus. The controller, after the controller completes the operation, it sends the output signal to the I/O board through the bus, which improves the accuracy of the control.

Among them, the signal anti-jamming system not only uses software means for information compensation and linearization, but also is used to shield the system and external leads to prevent electromagnetic interference from space radiation. Its performance is: isolation and filtering of external leads, especially Power cables, signal cables, and control cables are arranged in layers; properly design grounding points and grounding devices, and improve the grounding system; it is strictly forbidden to combine signal cables and control cables, and it is strictly forbidden to share one cable for weak and strong signals, and use shielded cables reasonably and correctly . Thus, the safety and reliability of the system can be further improved.

At the same time, a PLC controller can also be connected to the data bus to realize functional control.

In practical application, the control system can be further improved according to the needs of users, as shown in FIG. 4 is a schematic structural diagram of the third embodiment of the present invention. In this embodiment, the process control level and the process monitoring level are connected through a communication network, so that multiple process control levels can be set to expand the total number of I/O points of the system.

The utility model has been described in detail above in conjunction with the accompanying drawings and specific embodiments, but the utility model is not limited thereto. Any person skilled in the art can make various deformations and modifications to the utility model within the scope of knowledge and without violating the purpose of the utility model.

Claims (8)

1. the Distributed Control System (DCS) that is used for Automation of Manufacturing Process is characterized in that comprising: field control level, process control level and process monitoring level; The field control level comprises on-site control device; Process control level comprises the standard input and output integrated circuit board that links to each other with on-site control device, the controller that links to each other with standard input and output integrated circuit board; The process monitoring level comprises active station, supervisor and the monitoring machine that links together through communication network; Wherein, controller and active station link together.

2. the Distributed Control System (DCS) that is used for Automation of Manufacturing Process according to claim 1 is characterized in that: standard input/output board cartoon is crossed data bus and is linked to each other with controller.

3. the Distributed Control System (DCS) that is used for Automation of Manufacturing Process according to claim 2 is characterized in that: process control level also comprises the signal jamproof system and is connected on the data bus.

4. the Distributed Control System (DCS) that is used for Automation of Manufacturing Process according to claim 2 is characterized in that: process control level also comprises the PLC controller and is connected on the data bus.

5. the Distributed Control System (DCS) that is used for Automation of Manufacturing Process according to claim 1 is characterized in that: said controller is the PID controller.

6. the Distributed Control System (DCS) that is used for Automation of Manufacturing Process according to claim 1 is characterized in that: said process control level links together through communication network and process monitoring level.

7. according to each described Distributed Control System (DCS) that is used for Automation of Manufacturing Process of claim 1-6, it is characterized in that: said process control level is the control box structure, on control box, is provided with the standard connection terminal.

8. the Distributed Control System (DCS) that is used for Automation of Manufacturing Process according to claim 7 is characterized in that: be provided with electric power system in the control box.

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