ABB 5SHX2645L0002/3HB012961R0001 IGCT Semiconductor Diode

Description

The use of DCS process alarm hierarchical control plays a key role in the safety of the site. According to the survey of relevant data, the selection of alarm has a great impact on the safety factor of alarm, and attention should be paid to the selection of alarm in the process of using this technology.
Through the study of different control systems, several principles for selecting alarms are obtained to ensure that alarms can play a full role in the system.

Hierarchical control technology can ensure that alarms in different areas are independent, and different alarms are used for alarm monitoring in each area, which can ensure timely alarm in case of abnormal conditions within the detection range to attract the attention of operators.
DCS process alarm hierarchical control technology can effectively improve the safety of the operation site and effectively guarantee the safety of construction personnel and enterprises. Based on the concept and characteristics of DCS, this paper studies the application of toxic and harmful gas alarm and key operating parameter alarm, in order to provide reference for scholars in this field.
01 DCS multi-layer and hierarchical control system
The basic design idea of DCS is to adopt the idea of decentralized control, centralized operation and management to achieve multi-level hierarchical control and cooperation structure. At present, it is mainly used in metallurgy, electric power, petrochemical and other fields.
DCS is a system to realize multi-level and hierarchical control. In the process of use, it has two basic hierarchical links: field control unit and operation station.
DCS basic grading link
● Field control unit:
It refers to the control system used near the site far away from the control center, which can monitor and control the site according to the mechanism of DCS itself. Different devices need to be prepared for the use of the field control unit, such as configuration plug-in, that is, corresponding central processor plug-in, power plug-in and communication plug-in are configured according to the system requirements to lay the foundation for later hierarchical control;
Redundancy configuration is one of the important links in the hierarchical control system. In the process of configuration, the host plug-in, power plug-in and communication plug-in should be configured redundantly; To achieve hierarchical control and monitoring on site, DCS shall be added to different hardware to ensure the reliability of hierarchical control.
● Operation station:
The operation station records and displays different data in the control system, which is a place to display human-computer interaction. Common operation stations include host computer control, display equipment, keyboard input equipment, etc. It is a place where manual operation is mainly used for recording and feedback, which mainly realizes various important functions such as displaying different data, alarming and operation.

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