Features:
- The CPU executes the S7-300 program and updates rack and distributed process data.
- Integrated work memory and optional load memory divide active execution from stored program blocks.
- MPI and PROFIBUS DP serve different engineering, controller, and field-device connections.
The operating system schedules the cyclic program, interrupts, timers, counters, and communication tasks.
Backplane data connects local modules while the DP interface maps remote station data.
CPU LEDs and the diagnostic buffer relate program, supply, and bus conditions to the controller state.
The Siemens 6ES7315-2AF03-0AB0 S7-300 CPU 315-2 DP may remain available for quotation and support beyond End-Of-Life (EOL) by the manufacturer (OEM).
Siemens 6ES7315-2AF03-0AB0 S7-300 CPU 315-2 DP Manuals,Datasheets,Link
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
Turning stored blocks into a cyclic control program
- Load memory: The memory card retains the complete program and configuration.
- Work memory: Active program and data blocks occupy the integrated execution space.
- Cycle path: Inputs are read, logic is executed, and output data is updated in sequence.
- Interrupts: Configured organization blocks handle timed, process, and diagnostic events.
Coordinating remote devices from the second interface
- Master role: The CPU polls as many as 64 configured PROFIBUS DP slaves.
- Slave role: An upstream master exchanges the assigned input and output areas with the CPU.
- Bus rate: All stations use the rate and addresses defined in the STEP 7 project.
- Process image: Remote bytes are mapped into the controller address areas used by the program.
Separating engineering and controller communication
- Programming access: STEP 7 reaches the CPU through the MPI network.
- Operator access: Configured OP communication shares CPU connection resources.
- S7 exchange: Controller-to-controller services use the assigned S7 connections.
- Node plan: Unique MPI addresses and the documented rate keep all partners reachable.
Tracing a stop condition through CPU evidence
- Supply check: The 24 V input remains inside the permissible range.
- Memory check: Load and work-memory blocks agree with the intended project.
- Bus check: MPI and PROFIBUS diagnostics identify a missing or mismatched station.
- Program check: The diagnostic buffer and status LEDs locate startup, runtime, and I/O events.