Hands-On Industrial Internet of Things

Processor module

The processor module is at the heart of the PLC system. It contains a board with one or more microprocessors that executes the operating system programs, the programs developed by the user, the memory where these programs are stored, as well as all of the components necessary for the operation. The processor module, as implemented by the operating system, provides a cycle that is composed of the following sequence of operations:

1. Updates the input memory area with the values ​​coming from the physical inputs
2. Executes the user program by operating on the values ​​of the memory and always keeping the results in the memory
3. Executes the system management programs, for example, for diagnostics
4. Writes the physical outputs of the ...