[Image] Click the blue text to follow immediately [Image] 1. The programmable controller uses a microprocessor as the central processing unit, which can control logical quantities and can also control analog quantities. Reference: Analog quantity 2. The PLC has logical operation functions and can describe various connections such as the series of relay contacts and parallel connections. Reference: Parallel 3. The PLC has A/D conversion and D/A conversion functions, completing the processing of analog quantities…