Questions regarding the input of Siemens frequency converters
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The M430 has 6 digital input points; are these 6 points controlled by the inverter’s CPU or by the PLC? If it is controlled by a PLC, how should the input addresses connected to the inverter be assigned? How to connect a PLC input module?
The 6 digital input points are provided merely to facilitate the implementation of various functions; it is not necessary to connect them all. Theoretically, you don’t need a PLC; it can be operated using the buttons on the frequency converter panel. If you need PLC control, you can use a bus or hardwiring. With hardwired addressing, the address is determined by the IO channel address of the PLC’s IO template. For the hardwiring method, it is necessary to refer to both the IO template wiring diagram and the frequency converter wiring diagram.
Does PLC control of the inverter mean that the PLC directly controls the inverter via its analog input points? If PLC control is used, then its 6 input points are basically useless; the sensors can be connected directly to the PLC, and the frequency converter can be controlled through the PLC. Is that what you mean? . . . Also, how does a frequency converter control its input terminals via the panel?