Siemens SIMATIC S7-300 CPU 315-2 DP PLC – 6ES7315-2AH14-0AB0, 256 KB Work Memory

The Siemens SIMATIC S7-300 CPU 315-2 DP (6ES7315-2AH14-0AB0) is a programmable logic controller central processing unit designed for industrial automation, machine control, and process monitoring. It features 256 KB of integrated work memory, an MPI communication interface, an integrated 24 V DC power supply, and a second interface supporting PROFIBUS DP master/slave communication.

This CPU executes PLC programs, processes automation logic, and communicates with compatible field devices and distributed I/O systems. Its modular design supports integration into compatible SIMATIC S7-300 configurations, making it suitable for industrial control applications and maintenance of existing automation systems.

The CPU requires a compatible Siemens Micro Memory Card (MMC) for program and load-memory storage. Engineering is supported through compatible versions of Siemens STEP 7 software.

Technical Specifications

Key Features

• 256 KB work memory: Supports PLC program execution and automation data processing.

• MPI communication: Provides connectivity to compatible Siemens programming devices and operator interfaces.

• PROFIBUS DP interface: Supports communication with compatible distributed I/O devices and field equipment.

• DP master/slave functionality: Enables integration into supported PROFIBUS network architectures.

• Integrated 24 V DC power supply: Designed for compatible S7-300 system installations.

• Micro Memory Card support: Provides the required external load memory for PLC programs.

• Modular PLC architecture: Integrates with compatible SIMATIC S7-300 racks and expansion modules.

Applications

• Industrial machine automation

• Production-line control systems

• PROFIBUS distributed I/O networks

• PLC-based process monitoring

• Manufacturing and packaging equipment

• Industrial control panels

• Maintenance and refurbishment of existing Siemens S7-300 installations

Compatibility and Installation Notes

Before ordering, confirm the exact part number, PLC rack configuration, installed I/O modules, PROFIBUS network settings, Micro Memory Card, and STEP 7 project compatibility. Replacing a CPU may require program transfer, hardware configuration checks, and commissioning by a qualified automation technician.

Important communication note: This CPU provides MPI and PROFIBUS DP interfaces. Do not assume it has an integrated PROFINET interface; verify the communication requirements of your existing system before selecting a replacement.

Availability notice: Siemens lists this product as phased out, with the phase-out effective date shown as October 1, 2023. Availability may depend on remaining stock and specialist automation spare-part suppliers. Confirm whether the unit is new, refurbished, or used, and verify warranty and authenticity before purchase.