SIEMENS 6ES7314-1AG14-0AB0 – S7-300 CPU 314 Central Processing Unit | SIMATIC S7-300 Platform
Engineering Background
The SIMATIC S7-300 series has been the backbone of mid-range industrial automation for over two decades, deployed across automotive assembly lines, chemical processing plants, water treatment facilities, and discrete manufacturing cells worldwide. The CPU 314 (6ES7314-1AG14-0AB0) represents Siemens’ proven architecture for applications demanding reliable sequential control, moderate analog processing, and deterministic scan-cycle performance — without the overhead of high-end CPUs.
Product Positioning
The 6ES7314-1AG14-0AB0 is engineered for procurement engineers and system integrators who require a drop-in replacement or new-build CPU for existing S7-300 racks. With 192 KB work memory, an integrated MPI interface, and compatibility with the full S7-300 I/O ecosystem, this module delivers field-proven reliability for both greenfield installations and legacy system maintenance.
Complete Technical Specifications
| Order Number | 6ES7314-1AG14-0AB0 |
| Product Family | SIMATIC S7-300 |
| CPU Type | CPU 314 |
| Work Memory | 192 KB (program + data) |
| Load Memory | Integrated 64 KB RAM; expandable via MMC up to 8 MB |
| Processing Speed | 0.1 ms / 1,000 binary instructions |
| Digital I/O (max) | 1,024 inputs / 1,024 outputs |
| Analog I/O (max) | 256 inputs / 256 outputs |
| Communication Interface | MPI (187.5 kbps – 12 Mbps) |
| MPI Connections | Up to 32 nodes |
| Timers / Counters | 256 / 256 |
| Data Blocks | Up to 511 DBs |
| Supply Voltage | 24 V DC (via backplane bus) |
| Power Consumption | 1.5 W (from backplane) |
| Operating Temperature | 0 °C to +60 °C |
| Storage Temperature | -40 °C to +70 °C |
| Relative Humidity | 10% – 95% (non-condensing) |
| Protection Class | IP20 |
| Dimensions (W×H×D) | 40 × 125 × 130 mm |
| Weight | Approx. 350 g |
| Programming Software | STEP 7 V5.x / TIA Portal (S7-300 migration) |
| Standards & Certifications | CE, UL, cULus, ATEX Zone 2 (with appropriate housing) |
| HS Code | 8537.10 |
Proven Application Environments
- Automotive Manufacturing: Body-in-white welding cells, conveyor sequencing, and press control with deterministic cycle times under 10 ms.
- Chemical & Petrochemical: Batch reactor control, valve sequencing, and safety interlock coordination in ATEX Zone 2 environments (with appropriate enclosure).
- Water & Wastewater Treatment: Pump station automation, dosing control, and SCADA integration via MPI/PROFIBUS gateway.
- Food & Beverage: Filling line control, CIP sequence management, and recipe-based production with DB-driven parameter storage.
- Building Automation & Utilities: HVAC control, energy metering, and facility management integration.
- Machine Tool & OEM Equipment: Retrofit and spare-part replacement for installed S7-300 machine bases.
Engineering Advantages
- 192 KB Unified Work Memory: Sufficient for complex ladder/FBD programs with extensive data logging — no memory segmentation constraints typical of lower-tier CPUs.
- MPI Multi-Point Interface: Native support for PG/PC programming, HMI (TP/OP panels), and S7 routing without additional communication modules.
- MMC-Based Program Retention: Micro Memory Card stores program and data non-volatilely — no battery required for program backup, reducing maintenance overhead.
- Modular Rack Architecture: Compatible with all S7-300 signal modules (SM), function modules (FM), and communication processors (CP) — no rack redesign required for expansion.
- STEP 7 & TIA Portal Compatible: Fully programmable in STEP 7 V5.x; importable into TIA Portal for migration projects.
- Proven MTBF: Siemens-rated mean time between failures exceeding 500,000 hours under standard industrial conditions.
System Architecture & Signal Flow
The 6ES7314-1AG14-0AB0 mounts in Slot 2 of any S7-300 rack (UR1/UR2/ER1/ER2). The CPU communicates with signal modules via the S7-300 backplane bus at 48 V DC logic levels. Program execution follows a deterministic scan cycle: Input Update → Program Execution → Output Update → Communication Services. The MPI port (X1) supports simultaneous connections to a programming device, up to 4 HMI panels, and S7 routing to remote stations. An optional MMC (not included) inserted into the card slot provides non-volatile program storage and enables CPU firmware updates.
Typical rack configuration: PS 307 (Slot 1) → CPU 314 (Slot 2) → SM/FM/CP modules (Slots 4–11, up to 8 modules per rack, expandable via IM 360/361 to 3 expansion racks).
Sourcing & Quality Verification
- Origin: Sourced from authorized Siemens distribution channels and verified industrial surplus with full traceability documentation.
- Inspection Protocol: Each unit undergoes visual inspection (housing integrity, connector condition, label authenticity), functional power-on test, and firmware version verification prior to shipment.
- Authenticity Markers: Genuine units carry Siemens holographic labels, CE/UL markings, and a traceable serial number on the front panel. Konmask provides documentation upon request.
- Packaging: Anti-static ESD bag + foam-lined carton. Conforms to IEC 61340-5-1 ESD handling standards.
- Warranty: 12-month operational warranty against manufacturing defects. DOA replacement within 7 business days.
Procurement Process
- Confirm Part Number: Verify 6ES7314-1AG14-0AB0 against your BOM or existing rack label. Check firmware version requirements with your STEP 7 project.
- Request Quote / Place Order: Add to cart or contact support@konmask.com for volume pricing, lead time confirmation, and export documentation.
- Lead Time: In-stock units ship within 1–3 business days (CN warehouse). International DHL/FedEx express available.
- Documentation Package: Certificate of conformity, packing list, and commercial invoice provided with every shipment. EU/UK customs HS code 8537.10 pre-declared.
- Payment Terms: T/T, PayPal, credit card (Shopify Payments). Net-30 available for verified corporate accounts — contact us for credit application.
Technical FAQ
Q: Is the 6ES7314-1AG14-0AB0 a direct replacement for the 6ES7314-1AG13-0AB0?
A: Yes. The AG14 revision is backward-compatible with AG13 in terms of rack mounting, I/O addressing, and STEP 7 project compatibility. Firmware may differ — verify with your STEP 7 version before swapping in a live system.
Q: Does this CPU require a Micro Memory Card (MMC)?
A: An MMC is required to retain the user program after power loss. The CPU will operate without an MMC for testing, but program loss will occur on power cycle. Order MMC separately (e.g., 6ES7953-8LF31-0AA0 for 4 MB).
Q: Can this CPU communicate with PROFIBUS DP slaves?
A: The CPU 314 (6ES7314-1AG14-0AB0) does not have an integrated PROFIBUS DP interface. Add a CP 342-5 (6GK7342-5DA02-0XE0) communication processor to the rack for PROFIBUS DP master/slave functionality.
Q: What is the maximum number of I/O modules per system?
A: Up to 32 modules across 4 racks (1 central + 3 expansion racks via IM 360/361), supporting up to 1,024 DI/DO and 256 AI/AO channels.
Q: Is TIA Portal programming supported?
A: The S7-300 family is supported in TIA Portal V13 and later via the S7-300 migration path. Native programming remains STEP 7 V5.x. Full TIA Portal native support requires migration to S7-1500 hardware.
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