Siemens SIMATIC S7-300 CPU 314 PLC – 6ES7314-1AG14-0AB0, 128 KB Work Memory

The Siemens SIMATIC S7-300 CPU 314 (6ES7314-1AG14-0AB0) is a programmable logic controller central processing unit designed for industrial automation and machine-control applications. It features 128 KB of integrated work memory, an MPI communication interface, and an integrated 24 V DC power supply.

The CPU 314 executes PLC programs, processes control logic, and communicates with compatible programming devices and automation equipment through its MPI interface. It supports a Micro Memory Card (MMC), which is required for program and load-memory storage. The unit is designed for modular SIMATIC S7-300 control systems used in production machinery, industrial processes, and equipment automation.

This CPU is particularly suitable for maintaining existing S7-300 installations where the original hardware configuration, PLC program, and communication requirements are compatible.

Technical Specifications

Key Features

• 128 KB work memory: Provides integrated memory for executing supported PLC control programs.

• MPI communication interface: Supports communication with compatible Siemens programming devices and automation components.

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

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

• Modular automation design: Integrates into compatible S7-300 system configurations.

• Reliable legacy-system maintenance: Helps maintain existing industrial equipment that uses the CPU 314 platform.

Applications

• Industrial machine automation

• Production-line control systems

• PLC-based process sequencing

• Industrial equipment monitoring

• Factory automation and control panels

• Maintenance and refurbishment of Siemens S7-300 systems

Compatibility and Installation Notes

Before ordering, verify the exact CPU part number, S7-300 rack configuration, Micro Memory Card requirements, STEP 7 software version, and existing PLC program. Replacing a CPU may require program transfer, hardware configuration checks, and commissioning by a qualified automation technician.

Product availability notice: Siemens lists this model under its product phase-out announcement, effective October 1, 2023. Availability may depend on remaining stock and specialist spare-part suppliers. Confirm whether the item is new, refurbished, or used, and check warranty and authenticity before purchase.