1. programming language: The main programming languages used by Schneider PLC are ladder diagram and structured text, while the main programming languages used by Siemens PLC are ladder diagram and S7-SCL.
2. Software platform: Schneider PLC uses Unity Pro software platform, and Siemens PLC uses TIA Portal software platform.
3. Hardware: Schneider PLC and Siemens PLC have different hardware features. Schneider PLC usually has higher working frequency and more input/output (I/O) module options, while Siemens PLC has more communication interfaces and module options.
4. Openness: Schneider PLC is more open, allowing users to use different programming languages, such as C and Python, and to connect external devices and systems. Siemens PLC is more closed, and users rely more on Siemens' own programming language and software platform.
Although Schneider PLC and Siemens PLC are different in programming methods and some functional features, their basic principles and purposes are the same: they are used to realize automatic control and programming logic. The specific choice of PLC depends on the application requirements, industrial standards and personal preferences.