CPU With Mpi Interface 6ES7315-2AH14-0AB0 6ES7 315-2AH14-0AB0 6ES7315-2AH14-OABO

Siemens 6ES7315-2AH14-0AB0 SIMATIC S7-300 CPU 315-2 DP

Overview

The 6ES7315-2AH14-0AB0 is a SIMATIC S7-300 CPU 315-2 DP. Siemens identifies it as a central processing unit with MPI, with integrated 24 V DC power supply, 256 KB work memory, and a second interface DP master/device.

Siemens also states that a Micro Memory Card is required, and the product data lists firmware V3.3 and support for isochronous mode.

This CPU belongs to the established S7-300 central-controller range and is intended for modular rack-based automation systems.

Siemens product and support documents place it clearly in the CPU class of the S7-300 family, not in the compact-controller or distributed-I/O category. 

That means its role is central to the structure of the rack, the program memory class, and the communication layout of the installed system.

Technical Data

Application Value

This CPU is suitable for S7-300 modular control racks where the installed project requires a central CPU with MPI and DP communication in the same unit.

Its published memory size and integrated interface combination make it appropriate for systems where a smaller CPU would not match the original architecture or communication structure.

In replacement work, keeping the same CPU helps preserve the installed memory class, the rack-side controller role, and the original communication arrangement.

Since Siemens identifies this model as a specific CPU 315-2 DP variant with Micro Memory Card required, those points should remain unchanged if the goal is to maintain the existing automation structure.

Selection Notes

The main checks are the CPU 315-2 DP designation, the 256 KB work memory, the MPI + DP interface structure, and the Micro Memory Card requirement.

These are the core compatibility points for this CPU in an installed S7-300 rack.

FAQ

Q1: What kind of CPU is 6ES7315-2AH14-0AB0?
It is a SIMATIC S7-300 CPU 315-2 DP. Siemens identifies it as a central processing unit with 256 KB work memory, MPI, and a second DP master/device interface, which places it in the modular S7-300 CPU family.

Q2: Why is the 256 KB work memory important?
Because the memory class is one of the defining characteristics of the CPU.

Siemens specifies 256 KB work memory for this model, and that directly affects its place within the S7-300 range and the size of the project it is intended to support.

Matching the same memory class is important in replacement work.

Q3: What does the DP master/device interface add?
It means the CPU includes a second interface specifically for DP master/device communication in addition to MPI.

This interface structure is part of the original system architecture and is one of the key reasons this model is selected for modular S7-300 systems.

Q4: Why is the Micro Memory Card requirement relevant?
Because Siemens explicitly states that a Micro Memory Card is required for this CPU.

That is part of the installed hardware setup and should be verified whenever the CPU is being replaced or recommissioned in an existing rack.

Q5: What should be checked before ordering?
Check the installed part number, confirm the controller is CPU 315-2 DP, verify the 256 KB memory class, and make sure the installed rack depends on the same MPI and DP communication structure together with the required Micro Memory Card.