| Parameter | Description |
| Model Number | 6ES7518-4FP00-0AB0 |
| Product Type | SIMATIC S7-1500 CPU Module – CPU 1518F-4 PN/DP (Fail-Safe) |
| Power Supply | 24 V DC |
| Dimensions | 175 mm × 147 mm × 129 mm |
| Weight | Approx. 2079 g |
| Technology Functions | - High-speed counting (up to 200 kHz)<br> - Pulse-width modulation (PWM)<br> - PID control (standard & fail-safe)<br> - Motion control (up to 20 axes)<br> - Fail-safe logic (SIL 3 / PL e)<br> - Integrated web server, SNMP, alarm handling<br> - System redundancy support<br> - Real-time diagnostics and trace functions |
| Expansion Capability | Up to 32 modules (signal, communication, and technology) on the local I/O rack |
| Installation | DIN rail mounting (35 mm top-hat rail, per IEC 60715); uses S7-1500 backplane bus; requires front connector (e.g., 6ES7971-0BB00-0XA0); IP20 protection (for use in control cabinets) |
The Siemens 6ES7518-4FP00-0AB0 (CPU 1518F-4 PN/DP) is the highest-performance fail-safe CPU in the SIMATIC S7-1500 series, designed for mission-critical and complex automation tasks. It is primarily used in applications that require both ultra-fast processing and functional safety (SIL 3 / PL e), such as large-scale manufacturing systems, high-speed packaging lines, robotics, and process automation. Its 6 MB of program memory and 1 ns instruction execution speed make it ideal for handling advanced control algorithms, motion control for up to 20 axes, and extensive data processing.
| Question | Answer |
| 1. What does "F" mean in CPU 1518F-4 PN/DP? | The "F" stands for Fail-Safe. This CPU supports safety-related control tasks (e.g., emergency stops, safety interlocks) and is certified to SIL 3 (IEC 61508) and PL e (EN ISO 13849-1). Safety logic is programmed using STEP 7 Safety Advanced in TIA Portal. |
| 2. How many PROFINET ports does this CPU have? | It has 4 integrated PROFINET ports, each with an integrated 2-port switch. This enables flexible network topologies such as rings, lines, or stars, ideal for large automation networks or redundancy setups. |
| 3. Can this CPU replace an S7-400F system? | Yes. The 6ES7518-4FP00-0AB0 is designed as a direct high-end replacement for S7-400/S7-400F systems. It offers superior performance, larger memory, native PROFINET, and full integration into TIA Portal, making it ideal for modernization and system upgrades. |
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