It's 40 nanometers.
The S7-1200, short for SIMATIC S7-1200, is a compact, modular PLC that performs tasks such as simple logic control, advanced logic control, HMI and network communication. This is Siemens PLC, is a single chip microcomputer, generally speaking, the chip of this kind of equipment is mostly 40 nanometer process, a small part of 28 nanometer process, because there is no space requirements, coupled with cost control problems.
At present, a large number of domestic industrial control chips only need 40nm, 55nm and other well-established processes, but they still need to rely heavily on imports. \"The importance of 7nm and 5nm benchmarking is understandable, but 55nm and 40nm with more markets also need more attention.\"