Product Overview

SIMATIC S7-300 CPU 314C-2 PN/DP Compact CPU (6ES7314-6EH04-0AB0)
A compact yet powerful central processing unit in the S7-300 series—offering 192 KB of integrated work memory, versatile I/O, and dual network interfaces (MPI/DP and Ethernet PROFINET), complete with a built-in 24 V DC power supply. A Micro Memory Card is required for operation.
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Technical Specifications
Attribute Details
Work Memory 192 KB, integrated (not expandable)
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Digital Inputs (DI) 24 channels (24 DI)
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Digital Outputs (DO) 16 channels (16 DO)
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Analog Inputs (AI) 4 channels
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Analog Outputs (AO) 2 channels
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Temperature Sensor Input 1 × Pt100 channel
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High-Speed Counters 4 counters, up to 60 kHz
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Interface 1 MPI/DP at 12 Mbit/s
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Interface 2 Ethernet PROFINET with 2-port switch, supports isochronous mode
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Power Supply Integrated 24 V DC (19.2–28.8 V range)
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Power Consumption Rated ≈ 850 mA; no-load ≈ 190 mA; Inrush current ≈ 5 A, I²t ≈ 0.7 A²·s
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Power Loss Typical 14 W
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Processing Times Bit ops: ~0.06 µs; Word ops: ~0.12 µs; Fixed-point: ~0.16 µs; Floating-point: ~0.59 µs
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Block Capacity Up to 1024 blocks each for DB, FC, FB; includes defined OBs for errors, startup, alarms, etc.
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Backup & Memory Uses Micro Memory Card (MMC) up to 8 MB; retains data ≥ 10 years; no battery required
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Expansion Capabilities Up to 3 expansion units; includes 1 DP master; supports up to 4 racks with max 8 modules each
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Clocks & Backup Hardware real-time clock, retentive and syncable, backup up to ~6 weeks @40 °C
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PROFINET Features Acts as IO Controller and Device, web server, routing, media redundancy, IRT support
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Isolation Standard Tested to 600 V DC
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Ambient Operating Temperature 0 °C to 60 °C
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Product Lifecycle & Ordering Info

Lifecycle Status: Active, but phase-out announced since October 1, 2023
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Electric Automation Network

Standard Lead Time: ~1 day ex-works
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Net Weight: ~0.785 kg
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Packaging Dimensions: 13.4 × 15.3 × 12.7 cm
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Country of Origin: Germany
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Export Control: AL: N / ECCN: EAR99H
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RoHS Compliance: Since September 13, 2011
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WEEE Take-Back: Applicable
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REACH (Art. 33) substances: Contains several candidates (e.g. lead, lead monoxide, lead salt, BPA, PFBS) above 0.1% w/w; no expected risk if used/disposed properly
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Classification Codes: eClass, ETIM, UNSPSC categories available
Electric Automation Network
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Engineering Insight

All-in-One Control Module
This Compact CPU integrates digital, analog, and temperature IO with high-speed counters and extensive PLC block support—ideal for centralized control tasks with compact design.

Advanced Networking
Dual interfaces (MPI/DP and Ethernet PROFINET) offer flexibility—suitable for traditional PROFIBUS setups or modern real-time PROFINET networks with web and routing functionalities.

Robust Automation Performance
Supports fast execution of logic, floating-point, and bit operations; Micro Memory Cards allows long-lasting, battery-free project memory.

Scalable Architecture
Supports rack expansion, DP master capabilities, and various OB/FC/FB configurations—making it flexible for growing automation systems.

Lifecycle Planning
Although still available, planning for a replacement is advisable, since phase-out began in October 2023. Good stock management ensures seamless transitions for long-term deployments.