SIEMENS 6ES7315-6FF04-0AB0 – Failsafe CPU 315F-6DP/DP | SIMATIC S7-300 Platform
Engineering Background
The SIMATIC S7-300 series has been the backbone of industrial automation for over two decades, deployed across process industries, automotive manufacturing, and critical infrastructure worldwide. The CPU 315F-6DP/DP represents the failsafe tier of this platform — engineered to meet IEC 61508 SIL 3 and EN 954-1 Category 4 safety requirements without requiring a separate safety PLC. It integrates standard and safety-related control into a single compact module, reducing panel footprint and simplifying system architecture.
Product Positioning
The 6ES7315-6FF04-0AB0 is the preferred choice for procurement engineers who need a proven, certifiable failsafe controller with dual PROFIBUS-DP master interfaces, large working memory, and seamless integration into TIA Portal and STEP 7 environments. It is suitable for new installations and as a direct replacement in existing S7-300 safety systems.
Complete Technical Specifications
| Order Number | 6ES7315-6FF04-0AB0 |
| Product Family | SIMATIC S7-300 CPU 315F-6DP/DP |
| Work Memory | 512 KB (code + data) |
| Load Memory | Expandable via MMC (Micro Memory Card), up to 8 MB |
| Processing Speed (Bit) | 0.05 µs per bit operation |
| Processing Speed (Word) | 0.1 µs per word operation |
| Processing Speed (Float) | 0.6 µs per floating-point operation |
| Digital I/O Addresses | 16,384 / 16,384 (inputs/outputs) |
| Analog I/O Addresses | 1,024 / 1,024 (inputs/outputs) |
| PROFIBUS-DP Interfaces | 2 × DP master/slave (MPI/DP + DP) |
| MPI Baud Rate | 187.5 Kbps |
| PROFIBUS Baud Rate | Up to 12 Mbps |
| Safety Integrity Level | SIL 3 per IEC 61508 / Category 4 per EN 954-1 |
| F-Runtime Group | Supported (F-CPU, F-I/O via PROFIBUS) |
| Clock / Timers | Real-time clock; 256 timers, 256 counters |
| Data Blocks | Up to 1,024 DBs |
| Supply Voltage | DC 24 V (via backplane bus) |
| Current Consumption (5 V) | 1.2 A (from S7-300 backplane) |
| Operating Temperature | 0 °C to +60 °C |
| Storage Temperature | −40 °C to +70 °C |
| Relative Humidity | 10 % to 95 %, non-condensing |
| Degree of Protection | IP 20 |
| Dimensions (W × H × D) | 80 × 125 × 130 mm |
| Weight | Approx. 988 g |
| Certifications | CE, UL, cUL, FM, ATEX (Zone 2), IECEx |
| Programming Software | STEP 7 V5.5+, TIA Portal V13+ |
Proven Application Environments
- Process Industry: Chemical reactors, oil & gas pipelines, refinery control — where SIL 3 emergency shutdown (ESD) is mandatory.
- Automotive Manufacturing: Robotic welding cells, press lines, and conveyor safety interlocks requiring Category 4 stop functions.
- Power Generation: Turbine governor control, boiler management systems, and grid-tie protection relays.
- Water & Wastewater: Pump station automation with distributed F-I/O over PROFIBUS-DP for remote safety monitoring.
- Pharmaceutical & Food: CIP/SIP process control with validated safety loops and audit-trail logging.
- Mining & Minerals: Conveyor belt emergency stop systems and crusher protection in harsh environments.
Engineering Advantages
- Integrated Failsafe Architecture: Combines standard and F-program execution in one CPU — eliminates the cost and complexity of a dedicated safety PLC.
- Dual PROFIBUS-DP Masters: Enables independent standard and safety I/O networks on separate buses, preventing cross-contamination of safety and standard signals.
- Large 512 KB Work Memory: Accommodates complex F-programs with extensive diagnostic blocks without memory constraints.
- Hot-Swap MMC: Program and parameter backup/restore without PC connection — critical for rapid field replacement.
- Certified to IEC 61508 SIL 3: Highest achievable SIL for a single-channel PLC architecture; accepted by TÜV, BV, and Lloyd’s Register.
- Backward Compatible: Drop-in replacement for earlier 6ES7315-6FF01/02/03-0AB0 variants with firmware update.
- Extensive Diagnostics: Integrated system diagnostics via STEP 7 and TIA Portal; supports ALARM_S and ALARM_8P for process-level fault reporting.
System Architecture & Signal Flow
The CPU 315F-6DP/DP operates within the standard S7-300 rack. The MPI/DP interface (X1) serves as the primary programming port and can be configured as a PROFIBUS-DP master for standard distributed I/O. The second DP interface (X2) is dedicated to the F-capable PROFIBUS-DP network, connecting Siemens ET 200S, ET 200M, or ET 200pro F-modules. Safety-relevant signals are transmitted using the PROFIsafe protocol over this bus, with CRC-protected telegrams and watchdog monitoring at both master and slave levels. The CPU executes F-programs in a dedicated F-runtime group, isolated from standard OB/FB/FC execution, ensuring deterministic safety response times.
Sourcing & Quality Verification
- Origin: Genuine SIEMENS production; sourced through authorized distribution and verified secondary market channels.
- Inspection: Each unit undergoes visual inspection, label authenticity check, firmware version verification, and functional power-on test prior to dispatch.
- Packaging: Ships in original or equivalent ESD-safe packaging with protective foam inserts.
- Documentation: Certificate of conformity and test report available upon request for regulated industries.
- Warranty: 12-month warranty against manufacturing defects; DOA replacement within 7 business days.
Procurement Process
- Step 1 – Inquiry: Submit your BOM or part number via email to [email protected] or WhatsApp +0086 19859288691.
- Step 2 – Quotation: Receive a formal quotation with lead time, unit price, and shipping options within 24 hours.
- Step 3 – Order Confirmation: Confirm PO; payment via T/T, PayPal, or credit card accepted.
- Step 4 – Dispatch: Ships within 1–3 business days via DHL, FedEx, or UPS with full tracking.
- Step 5 – After-Sales: Technical support available post-delivery for commissioning and integration queries.
Technical FAQ
Q: Is the 6ES7315-6FF04-0AB0 compatible with TIA Portal?
A: Yes. It is fully supported in TIA Portal V13 SP1 and later, as well as STEP 7 Classic V5.5+. F-programming requires the S7 Distributed Safety or S7 F Systems add-on package.
Q: Can this CPU replace a 6ES7315-6FF03-0AB0?
A: Yes, it is a direct hardware replacement. A firmware update may be required; the program is fully compatible after recompilation in STEP 7 or TIA Portal.
Q: What Micro Memory Card (MMC) is required?
A: Any standard SIMATIC MMC (6ES7953-8Lxx0-0AA0 series) from 64 KB to 8 MB is compatible. The MMC is not included and must be ordered separately.
Q: Does this CPU support PROFINET?
A: No. This variant uses PROFIBUS-DP only. For PROFINET-based safety systems, refer to the S7-300 CPU 317F-2 PN/DP (6ES7317-2FK14-0AB0) or the S7-1500F series.
Q: What is the typical delivery lead time?
A: In-stock units ship within 1–3 business days. For bulk orders or special configurations, lead time is confirmed at quotation stage.
Q: Is a safety certificate available for this unit?
A: Yes. TÜV-certified documentation for SIL 3 / Category 4 compliance is available upon request for regulated procurement processes.
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