How to control large current by PLC

As "Fontaine11"said, there are many special current detection sensor elements for detecting current, and you can also search online for the input range, such as 30A DC, output signal standard, such as 4-20MA DC, and power supply, such as AC220V/ or DC24V. Supplement: "How to convert 0-50A into 0- 10VDC?" This is done by the internal circuit of the current detection sensor. Usually there is a current transformer (electric-magnetic-electric signal) at the beginning, and then the collected signal is converted into the required standard signal by electronic circuit. In fact, you don't need to know much about the internal principle. Just put forward the input and output signal standard and range. There are many in the market, such as Shanghai Zhu Chen and Nanjing Sanmeng.