1. Introduction
With the rapid development of modern society and the increasing scarcity of land resources, and now living area of the building higher and higher. In accordance with the requirements of relevant state departments, more than six floor building over water must reach a certain pressure to, constant pressure water supply system will thus created. According to the requirements of water companies, all communities of the urban water supply situation in the living cell must enter the water company s monitoring network.
2. System Description
choose to use this system to complete PLC Twido family, according to their requirements and field wiring, as well as cost considerations, each of the two system cabinets remote I / O to form a station number to achieve the communication with the host computer , communication: MODBUS TCP / IP.
using Schneider components model: TWDLCAE40DRF TWDLCAA40DRF TWDAMI8HT
TWDNAC485T; ATV38. Another use of the local display and control device settings (custom), to set the water pressure by way of analog set to the PLC.
1) Because the two sets of the same control cabinet control requirements, it is basically the same configuration, select a TWDLCAE40DRF is to meet with the host computer s communication requirements. The model is a CPU with Ethernet ontology, TCP / IP protocol communications rate of 10/100Mbps, because the district located in the urban areas around some of the difficulties caused by wiring, so the way by wireless (CDMA) and remote server to achieve communication.
2) Twido PLC system can REMOTE LINK Add a way to implement remote PLC I / O mapping, this advantage is not fixed communications format to remote signal acquisition, remote PLC without programming, reducing the procedure volume.
3) Water Supply System is a very important indicator of the pressure and live according to the set pressure within the pipe network to control the water pressure to reach balance. Using Twido PID function within the existing well will be able to achieve the requirements. PID is a feature in the Twido module, a total of 14 such models can be used, as long as required for each module corresponding parameters can be set, including data current value, set value, proportional, integral, differential parameters value, etc..
4) I added a 485 extension options TWDNAC485T, with the ATV38 frequency converter for Modbus communications. Through the Modbus communication, the inverter parameter settings good premise, according to the final PID values to control the inverter operation frequency. In addition, the host computer requires some of the current data value of the inverter can be read through the program, including current actual frequency, the current electrical current.
3. Conclusion Advantages of using this configuration:
1) maximum use of the Twido PLC s communication series, three were communication port for remote PLC, master-slave and ATV38 converter, PC to conduct the necessary communications.
2) the means of communication controlled by inverter, inverter can be read within a number of parameters, such as motor current, motor speed, etc., for the frequency converter failure alarm, better maintenance of equipment, but also to avoid the simulation volume control means to cause the drift error. 1. Introduction
With the rapid development of modern society and the increasing scarcity of land resources, and now living area of the building higher and higher. In accordance with the requirements of relevant state departments, more than six floor building over water must reach a certain pressure to, constant pressure water supply system will thus created. According to the requirements of water companies, all communities of the urban water supply situation in the living cell must enter the water company s monitoring network.
2. System Description
choose to use this system to complete PLC Twido family, according to their requirements and field wiring, as well as cost considerations, each of the two system cabinets remote I / O to form a station number to achieve the communication with the host computer , communication: MODBUS TCP/ IP.
using Schneider components model: TWDLCAE40DRF TWDLCAA40DRF TWDAMI8HT
TWDNAC485T; ATV38. Another use of the local display and control device settings (custom), to set the water pressure by way of analog set to the PLC.
1) Because the two sets of the same control cabinet control requirements, it is basically the same configuration, select a TWDLCAE40DRF is to meet with the host computer s communication requirements. The model is a CPU with Ethernet ontology, TCP / IP protocol communications rate of 10/100Mbps, because the district located in the urban areas around some of the difficulties caused by wiring, so the way by wireless (CDMA) and remote server to achieve communication.
2) Twido PLC system can REMOTE LINK Add a way to implement remote PLC I / O mapping, this advantage is not fixed communications format to remote signal acquisition, remote PLC without programming, reducing the procedure volume.
3) Water Supply System is a very important indicator of the pressure and live according to the set pressure within the pipe network to control the water pressure to reach balance. Using Twido PID function within the existing well will be able to achieve the requirements. PID is a feature in the Twido module, a total of 14 such models can be used, as long as required for each module corresponding parameters can be set, including data current value, set value, proportional, integral, differential parameters value, etc..
4) I added a 485 extension options TWDNAC485T, with the ATV38 frequency converter for Modbus communications. Through the Modbus communication, the inverter parameter settings good premise, according to the final PID values to control the inverter operation frequency. In addition, the host computer requires some of the current data value of the inverter can be read through the program, including current actual frequency, the current electrical current.
3. Conclusion
Advantages of using this configuration:
1) maximum use of the Twido PLC s communication series, three were communication port for remote PLC, master-slave and ATV38 converter, PC to conduct the necessary communications.
2) the means of communication controlled by inverter, inverter can be read within a number of parameters, such as motor current, motor speed, etc., for the frequency converter failure alarm, better maintenance of equipment, but also to avoid the simulation volume control means to cause the drift error.