The use of DCS process alarm classification control plays a crucial role in the safety of the site. According to relevant data surveys, the selection of alarms has a significant impact on the level of alarm safety factor. When using this technology, attention should be paid to the selection of alarms.

This article proposes several principles for selecting alarms through the study of different control systems, ensuring that alarms can fully play their role in the system.

The hierarchical control technology can ensure that alarms in different areas are independent. Different alarms are used for alarm monitoring in each area, which can ensure timely alarm in case of abnormal situations within the detection range to attract the attention of operators.

DCS process alarm classification control technology can effectively improve the safety of the operation site, effectively ensuring the safety of construction personnel and enterprises. This article is based on the concept and characteristics of DCS, and studies the application of toxic and harmful gas alarms and key operating parameter alarms, in order to provide reference for scholars in this field.

1. DCS multi-layer hierarchical control system

The basic design concept of DCS is to adopt the idea of decentralized control, centralized operation and management, and achieve a multi-level hierarchical control and cooperative structure. At present, it is mainly used in fields such as metallurgy, power, and petrochemicals.

DCS is a system that implements multi-layer hierarchical control, which has two basic hierarchical links during use: on-site control unit and operation station.

DCS basic grading process

● On site control unit:

A control system that is used near the site and is far away from the control center, and can monitor and control the site based on the DCS’s own structure. The use of on-site control units requires the preparation of different devices, such as configuration plugins, which are configured according to the requirements of the system with corresponding central processing unit plugins, power plugins, and communication plugins, laying the foundation for later hierarchical control;

Redundancy configuration is one of the important links in hierarchical control systems, and during the configuration process, it is necessary to implement redundant configuration for host plugins, power plugins, and communication plugins; Implementing on-site hierarchical control and monitoring requires adding DCS 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 for displaying human-computer interaction. Commonly used operation stations include host control, display devices, and keyboard input devices, which are mainly used for manual operation recording and feedback. It mainly realizes various important functions such as displaying different data, alarms, and operations.

2. Application of DCS process alarm classification control technology

Toxic and harmful gas alarm

Through the study of different DCS process alarm classification control technologies, it has been found that the DCS devices used in current on-site work mainly detect and alarm toxic, harmful, and flammable gases. When these gases are detected, an alarm will be triggered. The alarms on the market have diverse characteristics, and to ensure the normal operation of DCS, standardized alarms should be used.

In the process of selecting alarms, the following rules should be noted:

● It must be able to provide power supply for monitoring toxic and harmful gases and other connecting components;

●Being able to emit appropriate alarm signals after detecting toxic and harmful gases until someone discovers them, greatly improving the effectiveness of the alarm function;

●The range of combustible gas monitoring should be within the normal explosion range;

●Adapt to the concentration and measurement range of toxic and harmful gases, ensuring the detection of harmful gases within the normal range;

●Indicating alarm equipment is quite important and the key to determining whether it can alarm correctly. In the process of selection and purchase, alarm equipment with fire protection and interlocking protection functions should be selected;

●The alarm should have independent monitoring and alarm functions, ensuring that each alarm only monitors toxic and harmful gases within its scope of responsibility;

●The installed alarm should have a continuous alarm function. If toxic and harmful gas leaks are found during use, the alarm function should be activated. When the concentration decreases, the alarm also needs to continue to sound to ensure timely detection of toxic and harmful gas leaks.

Alarm is the key to alarm classification control technology. In the use of modern DCS process alarm classification control technology, responsible personnel can select and use alarms based on the above principles to ensure the safety and standardization of the control site.

Key operating parameter alarm

Each parameter in the DCS process alarm classification control technology using computer control systems needs to be strictly set and controlled. If the parameters are too high or too low, it will cause incalculable losses to the site. It is required to achieve the accuracy and standardization of alarm parameters through strict data analysis when setting alarm parameters.

When setting the alarm mode, a pop-up window or voice alarm can be used to effectively increase the attention of staff, provide the best solution time for staff, and avoid more serious accidents and losses.

Pop up alarm mode

When setting up pop-up alarms, the operator achieves the accuracy of the alarm process through on-site monitoring and control. The pop-up window should be set in the center position of the control display page, making it convenient for the staff to pay attention to the location of the alarm and the direction of the problem at the first time, providing more preparation time for the operator to effectively solve the problems that occur during the process;

● Voice alarm method

The use of voice alarm function requires staff to record the voice alarm in advance according to possible situations on site, and play the alarm information through the computer’s voice output function.