COMPACT CPU 6ES7314-6EH04-0AB0 6ES7 314-6EH04-0AB0 6ES7314-6EHO4-OABO

Siemens 6ES7314-6EH04-0AB0 SIMATIC S7-300 CPU 314C-2 PN/DP

Overview

The 6ES7314-6EH04-0AB0 is a SIMATIC S7-300 CPU 314C-2 PN/DP compact CPU built for control systems that need local I/O, analog processing, fast counting capability, and Ethernet communication in one central processor.

Siemens describes this model with 192 KB work memory, 24 digital inputs, 16 digital outputs, 4 analog inputs, 2 analog outputs, 1 Pt100 input, 4 high-speed counters at 60 kHz, an MPI/DP interface at 12 Mbit/s, and a PROFINET interface with integrated 2-port switch.

Siemens also lists an integrated 24 V DC power supply, 2 × 40-pole front connectors, and a Micro Memory Card requirement for this CPU.

This hardware profile places the CPU 314C-2 PN/DP in a strong position for compact but functionally dense automation panels. It combines logic control, local signal handling, network communication, and dedicated machine-side features inside one S7-300 CPU body.

In practical cabinet use, that reduces the need for multiple separate signal modules when the machine already fits the compact-CPU structure of the 314C class. Siemens also identifies this exact part number as replacement hardware in the S7-300 family.

Technical Data

Application Value

This CPU fits compact machine automation, OEM control panels, handling systems, packaging equipment, and other S7-300 installations where the controller has to combine central logic with a substantial onboard I/O mix.

The built-in analog channels, Pt100 capability, and high-speed counters make it especially useful in machines that need direct signal handling and fast counting without immediately expanding into a wider module set.

Its PROFINET interface with integrated 2-port switch also supports modern network integration inside an established S7-300 architecture.

Selection Notes

The key points to verify are the CPU 314C-2 PN/DP designation, the 192 KB work memory, the exact onboard I/O mix, the PROFINET + MPI/DP interface structure, and the requirement for 2 × 40-pole front connectors plus a Micro Memory Card.

These characteristics define whether the unit matches the original installed S7-300 configuration.

FAQ

Q1: What kind of CPU is 6ES7314-6EH04-0AB0?
It is a SIMATIC S7-300 CPU 314C-2 PN/DP compact CPU. Siemens classifies it as a compact processor with integrated digital and analog I/O, onboard high-speed counters, MPI/DP communication, and PROFINET networking.

That means it is not just a central CPU with no local signals; it is a controller with significant onboard process connectivity.

Q2: Why is this CPU different from a standard non-compact S7-300 CPU?
This model includes substantial onboard hardware that standard central CPUs often do not provide in the same form.

Siemens lists 24 DI, 16 DO, 4 AI, 2 AO, 1 Pt100, and 4 high-speed counters inside the CPU itself.

That matters in machine design because the controller can cover more of the signal and counting workload without adding separate modules for every function.

Q3: What is the importance of the PROFINET interface with 2-port switch?
It allows the CPU to participate directly in Ethernet-based automation networks while keeping the compact S7-300 format.

The built-in 2-port switch is part of the published hardware structure, which is useful when the machine network is already designed around this CPU and its integrated PROFINET connection.

Keeping the same communication layout is important in replacement work.

Q4: Why does the Micro Memory Card requirement matter?
Siemens explicitly states that a Micro Memory Card is required for this CPU. That requirement is part of the installed hardware configuration and should be confirmed before startup or replacement.

It is a core compatibility point, not an optional accessory detail.

Q5: What should be checked before ordering?
Confirm the installed part number, verify that the machine requires CPU 314C-2 PN/DP, check the onboard I/O requirements, and make sure the existing system depends on the same MPI/DP, PROFINET, front connector, and Micro Memory Card structure.

Those items determine whether the replacement matches the original controller role.