The design of this control system program fully considers the long-term planning and expansion needs. The designed system scheme can ensure that operators and engineers can conveniently perform normal day-to-day operations, management, and maintenance without relying on system designers or other equipment supplier experts. This control system mainly uses the following core products:
·Upper software adopts internationally renowned software SIEMENS PCS7
Database software adopts internationally renowned product Microsoft SQL Server
·The control system uses the internationally renowned product SIEMENS S7-400H
· Network switch selects internationally renowned manufacturers
The above products used in this control system are equipped with system automatic detection and diagnosis functions. That is, when the system fails, the control system automatically gives the cause of the fault and gives a hint of the fault to facilitate the maintenance of the system engineer. At the same time, the standby system will automatically take over from the failed system.
In this control system, the alarm information of the system configuration is given a complete error message prompt, and the maintenance instructions provided by the system maintenance engineer are given. At the same time, detailed system test diagnosis information will be given to all equipment and systems in the system maintenance manual. That is, when a device in a system fails, the cause of the failure is given, and a suggested solution is provided to facilitate troubleshooting and increase the day-to-day maintenance experience of the system engineer. After referring to the information in the maintenance manual and the fault information provided by the control system, the maintenance engineer can quickly resolve the system fault and resume production.
The database system has powerful functions such as fault diagnosis, automatic data backup and recovery, which facilitates the later use and maintenance of the system.
The scheme of the automatic control system follows the following system design principles:
· Stable and reliable.
Advanced technology: technical considerations are appropriate for advancement, which facilitates the expansion and upgrade of the system, and is advanced within a certain period of time. The core equipment adopts a distributed modular design, allowing the system to be flexibly upgraded.
·Economical and practical: Optimized design, reasonable cost, high performance-to-price ratio and low maintenance cost; easy to operate, easy to grasp, clearly displayed, easy to maintain, durable, in the case of little difference in performance and function, It is preferred to use products with higher cost performance and standard interfaces, system design and equipment selection, and pay full attention to the maintenance capabilities in various places.
· Safe explosion-proof and protective.
1.1 Control System Network Structure
The control system network scheme is shown in the figure below:
The control system is divided into process control level, control management level, and communication network system.
• The process control level is composed of control stations that are connected through a redundant bus network.
· The control management level is located in the central control room and consists of an engineer workstation, operator workstations, printers, and communication interface devices. The central control room engineer station and operation station adopt Ethernet communication structure and protocol, and the communication system has self-diagnosis function;
The communication network system is divided into the management Ethernet and fieldbus control network. The control management level and each field control station are connected via Ethernet, and the boiler communication medium uses optical fiber.
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