Siemens es7517-3fp00-0ab0

By Abdullah Zahid
12 min read
Siemens 6ES7517-3FP00-0AB0 SIMATIC S7-1500F CPU 1517F-3 PN/DP failsafe PLC controller for safety-critical industrial automation

Siemens 6ES7517-3FP00-0AB0 SIMATIC S7-1500F CPU 1517F-3 PN/DP: Failsafe PLC Specifications, Pricing, and Selection Guide

Controls engineers evaluating a failsafe CPU for machinery safety compliance are typically down to one question: does this part meet SIL 3 or PLe, and does it handle both PROFINET and PROFIBUS in one unit? The Siemens 6ES7517-3FP00-0AB0 — the SIMATIC S7-1500F CPU 1517F-3 PN/DP — answers both. It delivers 3 MB program memory and 8 MB data memory, a dual-interface architecture combining PROFINET IRT with a 2-port switch and PROFIBUS DP, and independently certified SIL 3 / Performance Level PLe failsafe capability. If your project spec calls for failsafe logic, legacy PROFIBUS devices, and modern Ethernet I/O on one CPU, this is the part worth validating.

If you have already confirmed this is the right part, check current pricing and availability at LeadTime.ca — ships worldwide.

Who Should Buy the Siemens 6ES7517-3FP00-0AB0 — and Who Shouldn't

This CPU is the correct choice for engineers specifying a failsafe controller for machinery or process systems where SIL 3 / PLe certification is a hard project requirement and both PROFINET IRT and PROFIBUS DP connectivity are needed in a single module.

  • Your machine directive or process regulation requires SIL 3 or Performance Level PLe per ISO 13849-1
  • Your system architecture includes both legacy PROFIBUS DP field devices and modern PROFINET IRT I/O
  • Your program and data requirements fit within 3 MB program memory and 8 MB data memory
  • Your engineering environment runs STEP 7 TIA Portal V19 or later (for FW V3.1) or V14 or later (for FW V2.0)
  • You need integrated PROFIsafe V2.4 / V2.6 support without a separate safety controller
  • A single-CPU failsafe architecture is sufficient — you do not require dual-redundant failsafe CPU pairing

If your application does not require failsafe operation, the 6ES7517-3AP00-0AB0 (CPU 1517-3 PN/DP) offers the same interfaces and memory at 25–30% lower cost. If you need dual-CPU redundant failsafe pairs, evaluate the 6ES7517-4RP70-0AB0 (CPU 1517H-3) instead.

On this page:

What the Siemens 6ES7517-3FP00-0AB0 Actually Does in a Live System

The Siemens 6ES7517-3FP00-0AB0 is the processing brain of a SIMATIC S7-1500F failsafe control system. It executes both standard and failsafe user programs simultaneously, enforcing SIL 3-rated safety logic — emergency stop monitoring, safe-state transitions, and fault detection — within the same CPU that handles standard machine control. This eliminates the separate safety controller that older architectures required, consolidating program execution, communications management, and safety certification into one 175 mm wide module.

The dual interface design is the practical differentiator on this model. The primary PROFINET IRT interface uses a built-in 2-port Ethernet switch, allowing daisy-chaining of PROFINET devices without an external switch on small topologies. The PROFIBUS DP interface supports RS485 at up to 12 Mbit/s, connecting legacy field devices — drives, valve islands, remote I/O stations — that have not yet migrated to Ethernet. Both interfaces can operate concurrently. For systems straddling a legacy-to-modern infrastructure transition, this dual interface is a direct cost and complexity reduction.

The 6.1 cm front display provides local diagnostics without an engineering laptop. Status LEDs for RUN, STOP, ERROR, MAINT, and LINK TX/RX remain active even when the display auto-dims above the temperature threshold. The integrated trace system supports 8 simultaneous traces at up to 512 kB each, giving commissioning engineers fault-capture capability without additional hardware. PID control is integrated with built-in optimization, and both distributed isochronous mode (minimum 250 µs cycle) and central isochronous mode (minimum 1 ms cycle) are supported for time-critical process loops.

Typical System Architecture for the CPU 1517F-3 PN/DP

The 6ES7517-3FP00-0AB0 sits at the controller layer of the automation hierarchy, above field devices and below the SCADA or HMI level, managing all safety and standard logic execution and serving as the communications hub between PROFINET IRT and PROFIBUS DP network segments.

  • Engineering workstation running STEP 7 TIA Portal V19 or later connects via Ethernet to the CPU 1st interface for program download, diagnostics, and firmware management
  • CPU 1517F-3 PN/DP mounts on DIN rail in the main control panel, powered by 24 V DC external supply with overcurrent protection upstream
  • PROFINET IRT daisy-chain connects ET 200SP remote I/O stations, safety I/O modules, and HMI panels via the built-in 2-port switch on the 1st interface
  • PROFIBUS DP RS485 trunk connects legacy drives, valve manifolds, and older safety devices on the 3rd interface at up to 12 Mbit/s
  • SIMATIC Memory Card installed in the CPU acts as program backup and enables firmware storage; up to 320 total connections supported across integrated and module-connected interfaces

Industries and Applications Where the CPU 1517F-3 Gets Specified

The CPU 1517F-3 PN/DP is most commonly specified in machinery OEM applications where CE marking under the Machinery Directive requires documented SIL 3 or PLe safety capability. Assembly robots, industrial conveyors with emergency pull-cord stop functions, and press safety circuits are typical starting points. The 250 µs distributed isochronous cycle time makes it suitable for fast process response requirements beyond standard PLC scan rates.

In food and beverage processing and chemical mixing, the integrated PID controller with optimization handles temperature and pressure loops while the failsafe logic manages process interlocks — overpressure shutoff, temperature runaway protection — in the same CPU. This avoids the cost and complexity of a separate safety relay or safety controller for the interlock functions.

Legacy integration is a strong use case. Plants with existing PROFIBUS-based drives, weighing terminals, or older safety devices can connect them directly to the PROFIBUS DP interface on the 6ES7517-3FP00-0AB0 while adding new PROFINET IRT I/O for expanded automation without replacing the legacy field layer. Pharmaceutical clean-room systems and automotive subsystems with mixed network generations are typical examples of this architecture.

Application Typical Deployment
Safety-critical conveyor emergency stop CPU 1517F-3 monitors pull-cord input via PROFIsafe; forces safe stop within 250 µs distributed cycle
Industrial packaging machinery (CE marked) Failsafe program enforces PLe-rated guard interlock and two-hand control; PROFINET connects I/O
Chemical or food process with safety interlocks Integrated PID on temperature/pressure loops; failsafe logic handles overpressure shutdown via same CPU
Legacy system integration with PROFIBUS devices PROFIBUS DP interface connects older drives and valve islands; PROFINET handles new ET 200SP I/O
Automotive or pharmaceutical subsystem control SIL 3-rated CPU manages safety interlocks; SysLog captures event history for compliance audit trail

Purchase-Decision Specs: What You Need to Know Before Ordering

Specification Value
Model / Catalog Number 6ES7517-3FP00-0AB0
Safety Rating SIL 3 / Performance Level PLe (ISO 13849-1)
Program Memory 3 MB
Data Memory 8 MB
Primary Interface PROFINET IRT, 2-port integrated switch
Secondary Interface PROFIBUS DP (RS485, up to 12 Mbit/s)
Minimum Distributed Cycle Time 250 µs (isochronous mode)
PROFIsafe Support V2.4 / V2.6
Operating Temperature (Horizontal) 0–60 °C (display off above 50 °C)
Dimensions (W × H × D) 175 mm × 147 mm × 129 mm, approx. 1929 g

Full technical specifications are available on the product page at LeadTime.ca.

Siemens 6ES7517-3FP00-0AB0 vs. Alternatives: Which Variant Do You Actually Need?

Model Designation Failsafe Interfaces Program Memory Data Memory Safety Rating Cost Relative Best For
6ES7517-3FP00-0AB0 CPU 1517F-3 PN/DP Yes PROFINET + PROFIBUS 3 MB 8 MB SIL 3 / PLe Baseline Failsafe machinery with dual legacy and modern networks
6ES7517-3AP00-0AB0 CPU 1517-3 PN/DP No PROFINET + PROFIBUS 3 MB 8 MB Standard 25–30% lower Standard automation; no safety requirement
6ES7517-3UP00-0AB0 CPU 1517TF-3 PN/DP Yes PROFINET only 3 MB 8 MB SIL 3 / PLe 5–10% lower Failsafe PROFINET-only greenfield projects
6ES7517-4RP70-0AB0 CPU 1517H-3 PN/DP Yes (Redundant) PROFINET + optional PROFIBUS 3 MB 8 MB SIL 3 / PLe 60–80% higher Mission-critical dual-CPU failsafe systems

If your architecture requires both PROFINET IRT and PROFIBUS DP with SIL 3 failsafe, the 6ES7517-3FP00-0AB0 is the correct choice — check current availability at LeadTime.ca.

Expert Verdict: Honest Assessment and Procurement Reality

The Siemens 6ES7517-3FP00-0AB0 is a well-proven failsafe CPU for mid-to-large machinery and process control applications where a single module needs to carry both safety and standard logic across mixed network generations. The combination of SIL 3 / PLe certification, PROFINET IRT with integrated 2-port switch, and PROFIBUS DP on one unit is genuinely useful in retrofit and hybrid architectures — it removes the cost of a standalone safety controller and a separate communications gateway. The documented PFH of less than 1.00E-09 for high-demand / continuous mode and PFDavg of less than 2.00E-05 for low-demand mode over 20 years are independently verifiable numbers that safety engineers can carry directly into a FMEA or functional safety assessment.

Where the 6ES7517-3FP00-0AB0 has real limits: it does not support dual-CPU redundant failsafe pairing. If your process requires that level of availability — continuous operation with no single point of failure at the CPU level — the 6ES7517-4RP70-0AB0 is the correct path, with a significantly higher cost and integration complexity. For greenfield projects using PROFINET-only infrastructure, the 6ES7517-3UP00-0AB0 eliminates the PROFIBUS interface and reduces cost by 5–10% without sacrificing failsafe capability. And for any application where SIL 3 is not a hard requirement, paying the failsafe premium for the 6ES7517-3FP00-0AB0 is straightforward cost waste — the 6ES7517-3AP00-0AB0 handles identical standard automation tasks at 25–30% less. If this matches your system requirements, view current stock and pricing at LeadTime.ca.

On the procurement side, the CPU 1517F-3 PN/DP is a standard inventory item at major industrial automation distributors globally, with typical lead times of 2–6 weeks for standard orders. Expedited availability is possible through established distributors at a cost premium. Firmware version matters at order time: current production units ship with FW V3.1, which requires STEP 7 TIA Portal V19 or later. Older stock may carry FW V2.0, compatible with V14 or later — confirm firmware version with your distributor if your engineering environment has not been updated to V19. For volume orders or project-level pricing, direct contact with a distributor before project commitment is the correct approach.

For volume pricing or to confirm lead time before committing to a build, contact the LeadTime.ca team directly — we ship worldwide.

Wiring and Installation Overview

  • Mount the CPU on DIN rail in horizontal orientation for up to 60 °C ambient operation, or vertical for up to 40 °C; the 175 mm × 147 mm × 129 mm form factor requires appropriate enclosure planning
  • Connect 24 V DC to the power terminals with correct polarity; the CPU has no internal circuit breaker — install an external overcurrent protection device upstream before applying power
  • Insert the SIMATIC Memory Card into the designated slot before first power-up; the CPU requires the card present for program storage and backup operation
  • Connect PROFINET IRT Ethernet cable to the 1st interface RJ45 port; the built-in 2-port switch allows device daisy-chaining on the same interface without an external switch for simple topologies
  • Connect PROFIBUS RS485 differential-pair cable to the 3rd interface; verify 120 Ohm termination resistors are present at both physical ends of the PROFIBUS trunk before powering on

Compatible Modules and System Expansion

The Siemens 6ES7517-3FP00-0AB0 operates within the SIMATIC S7-1500F platform and is compatible with the following system components confirmed in the product documentation:

  • SIMATIC Memory Card — required for program storage; acts as backup medium and supports firmware storage
  • PS 60W 24/48/60 V DC HF power supply — required to access the full extended retentive data area of up to 8 MB
  • ET 200SP remote I/O stations — connect via PROFINET IRT to the 1st interface for distributed field I/O expansion
  • PROFIsafe-compatible safety I/O modules — interface via PROFIsafe V2.4 / V2.6 over PROFINET for failsafe field devices
  • PROFIBUS DP field devices (drives, valve manifolds, legacy remote I/O) — connect via the 3rd interface RS485 at up to 12 Mbit/s; maximum 320 total connections across integrated and module-connected interfaces

Wrong-Part Prevention: Six Checks Before You Order

Before placing your order for the Siemens 6ES7517-3FP00-0AB0, verify each of the following against your project requirements:

  1. Verify safety requirement: F-3 designation confirms failsafe mode; non-F variants lack this
  2. Check firmware version: Current data supports FW V3.1; older stock may have V2.0 with limited STEP 7 TIA Portal compatibility
  3. Interface confirmation: Confirm dual PROFINET IRT + PROFIBUS DP is needed; single-interface variants exist
  4. Memory adequacy: Verify 3 MB program + 8 MB data space meets application size
  5. Display requirement: This model includes front display; some OEM variants are display-less
  6. Redundancy exclusion: This CPU does not support redundant failsafe pairs (use 1517HR-3 for that)

If any of these checks raises a flag, contact the LeadTime.ca team before ordering — we can confirm the correct variant for your architecture and check current stock worldwide.

Frequently Asked Questions

Does the Siemens 6ES7517-3FP00-0AB0 support redundant CPU failsafe operation?

No. The CPU 1517F-3 PN/DP supports single-CPU failsafe operation with SIL 3 / PLe certification, but it does not support dual-CPU redundant failsafe pairing. If your application requires hardware redundancy at the CPU level, the 6ES7517-4RP70-0AB0 (CPU 1517H-3) is the correct alternative, at a 60–80% cost premium and with increased system complexity.

What version of STEP 7 TIA Portal is required for the 6ES7517-3FP00-0AB0?

Current production units shipping with FW V3.1 require STEP 7 TIA Portal V19 or later. Units with FW V2.0 are compatible with V14 or later. Confirm the firmware version of the unit you are ordering with your distributor if your engineering environment has not been updated to V19, as mismatched firmware and TIA Portal versions will prevent program download.

Can the CPU 1517F-3 PN/DP run standard (non-failsafe) logic alongside failsafe programs?

Yes. The 6ES7517-3FP00-0AB0 executes both standard and failsafe user programs simultaneously within the same CPU. Failsafe logic runs in dedicated F-runtime groups isolated from standard logic, as required by PROFIsafe V2.4 / V2.6 and IEC 61508. This eliminates the need for a separate safety controller for the failsafe functions.

What happens to the front display if the operating temperature exceeds the threshold?

The 6.1 cm front display automatically shuts off above 50 °C in horizontal installation and above 40 °C in vertical installation. The CPU continues normal operation — RUN, STOP, ERROR, MAINT, and LINK TX/RX status LEDs remain active regardless of display state. If display shutoff is persistent rather than transient, improve enclosure cooling to bring ambient back within operating range.

What is the documented failure rate for SIL 3 compliance on this CPU?

The CPU 1517F-3 PN/DP has a documented PFDavg (probability of dangerous failure on demand, low-demand mode, 20-year service life with 100-hour repair time) of less than 2.00E-05, and a PFH (probability of dangerous failure per hour, high-demand or continuous mode) of less than 1.00E-09. These figures support SIL 3 claim verification in a functional safety assessment per IEC 61508 or ISO 13849-1.

Is the 6ES7517-3FP00-0AB0 the right choice if my new system has no PROFIBUS devices?

If your architecture is PROFINET-only with no legacy PROFIBUS field devices, the 6ES7517-3UP00-0AB0 (CPU 1517TF-3 PN/DP) delivers equivalent SIL 3 / PLe failsafe capability without the PROFIBUS interface, at 5–10% lower cost and reduced cabling complexity. The 6ES7517-3FP00-0AB0 is the correct choice specifically when both PROFINET IRT and PROFIBUS DP coexistence is required.

Why Order from LeadTime.ca

  • Ships worldwide — no geographic restriction on orders, including hard-to-source Siemens safety CPU variants
  • Direct quote support for volume orders and project-level pricing on SIMATIC S7-1500F components
  • Distributor-level response for availability confirmation and firmware version verification before you commit to a build schedule
  • Sourcing support for related system components — memory cards, power supplies, ET 200SP I/O stations — to consolidate procurement

At-a-Glance Summary

  • Model: Siemens 6ES7517-3FP00-0AB0 — SIMATIC S7-1500F CPU 1517F-3 PN/DP
  • Safety certification: SIL 3 / Performance Level PLe per ISO 13849-1; PROFIsafe V2.4 / V2.6
  • Program memory: 3 MB; data memory: 8 MB; extended retentive data up to 8 MB with PS 60W HF supply
  • Interfaces: PROFINET IRT with 2-port integrated switch (1st interface) + PROFIBUS DP RS485 at up to 12 Mbit/s (3rd interface)
  • Minimum distributed isochronous cycle time: 250 µs; central isochronous: 1 ms
  • Maximum connections: 320 (integrated + module-connected)
  • Documented PFH (SIL 3, high-demand / continuous): less than 1.00E-09; PFDavg (low-demand, 20 years): less than 2.00E-05
  • Operating temperature: 0–60 °C horizontal (display off above 50 °C); 0–40 °C vertical
  • Dimensions: 175 mm × 147 mm × 129 mm; approx. 1929 g
  • Current firmware: V3.1 requires STEP 7 TIA Portal V19 or later; FW V2.0 compatible with V14 or later
  • Does not support dual-redundant CPU failsafe pairing — use 6ES7517-4RP70-0AB0 for that requirement
  • Typical lead time: 2–6 weeks; available worldwide through LeadTime.ca