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精選問答首頁 > 工控 > 三菱plc如何讀取變頻器的頻率

三菱plc如何讀取變頻器的頻率

2024-04-12 23:55:35
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工控2024-04-12 23:55:35

Three main ways to read the frequency of a variable frequency drive (VFD) using a Mitsubishi PLC, including the FX series, the Q series and the iQ-F series, are through analog input, digital input, and network communication.

1. Analog Input:
You can use the analog input module of the PLC to read the frequency of the VFD. This method involves connecting the analog output of the VFD to the analog input module of the PLC. The VFD's analog output usually provides a voltage or current signal that represents the frequency of the output. You can set up the PLC to read this analog input and convert it into a frequency value. With this method, the PLC can continuously monitor the frequency of the VFD and use this information for control and feedback purposes.

2. Digital Input:
Another method to read the frequency of the VFD is by using digital input. Some VFDs provide digital outputs that can be connected to the digital input module of the PLC. These digital outputs can send pulses that represent the frequency of the VFD. The PLC can then count these pulses over a certain period of time to calculate the frequency. This method is suitable for VFDs that do not have analog outputs or for applications where precise frequency measurements are not required.

3. Network Communication:
Many modern VFDs and PLCs support network communication protocols such as Modbus, Profibus, or Ethernet/IP. With this method, the VFD and PLC are connected over a network, allowing them to exchange data. The PLC can send a command to the VFD to request its frequency, and the VFD can respond with the current frequency value. This method provides a direct and reliable way to read the frequency of the VFD and allows for easy integration of the VFD into the overall control system.

In conclusion, there are multiple ways to read the frequency of a VFD using a Mitsubishi PLC. The choice of method depends on the specific VFD and PLC models, as well as the requirements of the application. By using analog input, digital input, or network communication, the PLC can effectively read the frequency of the VFD and utilize this information for control and monitoring purposes.

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