This blog is going to cover how to control a variable frequency drive using Modbus from an S7-1200 controller. The CB 1241 Module will be used to communicate with the VFD through Modbus RTU over RS485. The VFD will be driving a conveyor belt in a vision inspection system which will feature in future posts. For this example, the VFD will control a HVAC fan as a demonstration only....
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Butterfly valve control with an S7 1200 Controller. The screenshots are in Spanish for following the TIA Examples. This blog is highly detailed and goes from beginning to end with regard to the wiring, PLC programming through to the HMI design for visual feedback....
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