Introduction
With the rapid development of Chinas society, in order to meet peoples needs, water is widely used in our daily life and plays an important role in peoples lives. In order to make use of water resources effectively and reasonably, people began to build water plants to provide safe drinking water. In these water plants, PLCs are widely used to achieve automated operation and water treatment, and run stable and reliable control of pumps, valves, motors and other equipment. Here we will discuss the selection and maintenance of PLCs used in water plants.
1 Selection of PLC
When selecting a PLC for a water plant, it is important to consider factors such as the type of water plant, water source, water quality, water treatment process, system functions and budget.
1.1 Type of Water Plant
When selecting a PLC for a water plant, different types of water plants require different types of PLCs because different water plants have different functions, requirements and control procedures. For example, for an underground water plant, the PLC should be able to accurately and reliably monitor parameters such as water flow, pressure and water quality; for a surface water plant, the PLC must be able to control the operation of the water plant; for a seawater plant, the PLC should be able to accurately control the operation of pumps, valve and valves. overall system.
1.2 Water Source and Quality
Depending on the water source, different water plants require different water treatment processes. When selecting a PLC for a water plant, the water source and quality must be taken into consideration. For example, when selecting a PLC for a seawater desalination plant, a PLC with advanced desalination functions needs to be selected to be able to accurately control the operations of pumps, valves and valves.
1.3 Water Treatment Process
The control process of a water plant is different from that of other types of plants. The PLC used in a water plant should be able to detect the parameters of water flow, pressure and water quality, and accurately control the operations of pumps, valves and valves. In this regard, the PLC should have advanced functions such as analog input and output, pulse input and output, PID control, and flow and pressure control.
1.4 System Functions
The PLC used in a water plant should be able to meet the needs of water quality and system functions. Depending on the needs of the water plant, the PLC should have a powerful communication function and be able to support various communication protocols such as Ethernet, Modbus and Profibus.
1.5 Budget
When selecting a PLC for a water plant, the budget is also an important factor to consider. Different PLCs have different prices. To ensure the reliability and stability of the water plant, it is recommended to purchase PLCs from well-known and reliable brands.
2 Maintenance of PLC
Once the PLC is installed, regular maintenance is needed to ensure its reliability and stability.
2.1 Electrical System Maintenance
In water plants, the PLC is connected with other equipment and electrical systems, so it is important to check the wiring and connection status of the components regularly. For example, when a PLC fails or has a fault, it is important to check the power supply and cables.
2.2 Network Maintenance
For water plants, the network is an important part of the operation of the system. It is important to check the communication status of the PLC regularly. The communication protocols such as Ethernet, Modbus and Profibus should also be checked regularly to ensure they are functioning properly.
2.3 Software Maintenance
Software maintenance is important to ensure the PLC is running properly. The PLC software should be updated regularly to ensure the PLC is running the latest version. It is also important to back up the data frequently to ensure the data is not lost in the event of a system crash.
Conclusion
In conclusion, when selecting a PLC for a water plant, it is important to consider factors such as the type of water plant, water source and quality, water treatment process, system functions and budget. In addition, it is important to ensure regular maintenance of the PLC to ensure its reliability and stability. Although the selection and maintenance of the PLC are complicated, with well-thought out plans and procedures it is possible to achieve a safe and efficient operation of the water plant.
