Siemens SIMATIC S7-300 6ES7317-2FK14-0AB0 – CPU 317F-2 PN/DP for safety-critical machine control

The Siemens 6ES7317-2FK14-0AB0 is the SIMATIC S7-300 CPU 317F-2 PN/DP—a failsafe PLC CPU that combines standard and safety logic on one controller. From my experience, it’s a go-to choice when you need SIL 3 / PL e safety on fast, complex machines without sacrificing cycle time or network connectivity. You get integrated PROFINET and PROFIBUS DP, plus PROFIsafe for safe drives, safe I/O, and interlocks across cells.

Our Order Placement Process and Guarantees

• Warranty: 365 days
• Delivery: typically 1 week if in stock; no more than one month at the latest
• Payment: 50% advance payment; full payment prior to delivery
• Express options: FedEx, UPS, DHL

Key Features

• Failsafe CPU (F-CPU) – Designed for safety applications up to SIL 3 (IEC 61508) and PL e (ISO 13849), using PROFIsafe over PROFINET/PROFIBUS.
• Integrated PN/DP – One PROFINET interface for Ethernet-based networking and one PROFIBUS DP interface (MPI/DP capable) for distributed I/O and drives.
• Standard + Safety in one project – Program with STEP 7 and Distributed Safety; reduces panel space and simplifies validation.
• No onboard I/O – Choose exactly the SM modules you need, or run remote I/O like ET 200S/ET 200M to keep cabinets lean.
• Robust S7-300 platform – Stable performance for mid-to-large machines; typically favored in automotive, packaging, and press lines.
• Diagnostics and maintenance tools – Integrated system diagnostics and consistent F-signature handling help audits go faster in many cases.

Technical Specifications

Application Fields

You’ll typically see the 317F-2 PN/DP on machines where safety and speed matter: automotive welding cells, press and forming lines, palletizing systems, high-speed packaging, and conveyor interlocks across multiple zones. It’s especially handy when you want to keep safe logic inside the main PLC rather than using a separate safety relay network. One thing I appreciate is how cleanly it scales—remote ET 200 stations on both PROFINET and PROFIBUS make expansions straightforward.

Advantages & Value

• Reliability – Proven S7-300 platform with robust F-runtime; reduces nuisance trips when safety logic is engineered correctly.
• Compatibility – Works with the huge S7-300/ET 200 installed base; smooth swap-in for many existing cabinets.
• Cost control – Integrates standard and safety, which often trims hardware and wiring compared to separate safety relays or an extra safety PLC.
• Lifecycle support – Mature spare parts availability; we typically help with firmware matching and project migration when needed.
• Network flexibility – PN for plant-level Ethernet and DP for legacy drives/I/O, so brownfield upgrades are less disruptive.

“Swapped in the 317F-2 PN/DP on a transfer line and reused our ET 200M racks. Safety validation went faster than expected—kept our downtime to a single weekend.” — Maintenance Supervisor, Tier-1 Auto Supplier

Installation & Maintenance

• Panel environment – Install in an industrial cabinet (IP54 or better recommended), with adequate ventilation. Keep clearances at top/bottom for airflow.
• Power wiring – Feed via PS 307 (24 V DC). Separate 24 V supplies for safety output modules if required by your risk assessment.
• Networking – Use industrial Ethernet cables for PN; terminate PROFIBUS with active terminators and maintain segment lengths/baud rules.
• Grounding & EMC – Bond DIN rail and shield network/field cables as per Siemens EMC guidelines to avoid sporadic F-faults.
• Routine care – Back up the project to MMC; document and verify F-signatures after changes; keep dust off vents; update firmware only under change control.
• Safety handling – Any change to F-parameters or safety logic should be re-validated and signed off per your functional safety procedure.

Recommended Accessories & Companion Modules

• PS 307 24 V DC – S7-300 power supply (choose current rating to match your rack load).
• MMC for S7-300 – Program/firmware storage (select capacity as required by your project).
• SM 321 / SM 322 – Digital input/output modules, standard or failsafe variants for safety I/O.
• SM 331 / SM 332 – Analog input/output modules for process signals.
• ET 200S / ET 200M – Distributed I/O over PROFINET/PROFIBUS; F-modules available for safety channels.
• SCALANCE switches – Managed industrial Ethernet switches if you need network segmentation or ring topologies.

Quality & Certifications

• CE, UL/cUL
• RoHS compliant
• TÜV-certified F-functionality for SIL 3 (IEC 61508) and PL e (ISO 13849), PROFIsafe-capable
• Manufacturer’s standard warranty supported; our warranty: 365 days