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Copy| Product Name | Siemens 6ES7518-4AX00-1AC0 / 6ES7518-4FX00-1AC0 | SIMATIC S7-1500 CPU 1518-4 and 1518F-4 PN/DP MFP Bundles |
| Item NO. | 2927191 |
| Weight | 0.1 kg = 0.2205 lb = 3.5274 oz |
| Category | SIEMENS |
| Brand | SIEMENS |
| Creation Time | 2026-10-26 |
Standard and fail-safe high-performance MFP CPU bundles with C/C++ Runtime and OPC UA Runtime licenses.
Siemens 6ES7518-4AX00-1AC0 / 6ES7518-4FX00-1AC0 are SIMATIC S7-1500 MFP CPU bundles that combine STEP 7 control, C/C++ Runtime and an OPC UA Runtime license. The standard 6ES7518-4AX00-1AC0 is built around CPU 1518-4 PN/DP MFP, while the 6ES7518-4FX00-1AC0 uses the fail-safe CPU 1518F-4 PN/DP MFP for safety-program execution.
Across Siemens 6ES7518-4AX00-1AC0 / 6ES7518-4FX00-1AC0, the communication structure is shared: interface 1 provides PROFINET IRT with a two-port switch, interface 2 provides PROFINET RT, interface 3 provides PROFINET basic services and interface 4 provides PROFIBUS. The network plan can therefore preserve interface roles, but the project must still use the exact standard or F-CPU hardware identity.
For application sizing, Siemens 6ES7518-4AX00-1AC0 / 6ES7518-4FX00-1AC0 both provide 60 MB of data work memory, 1 ns bit performance and require a SIMATIC Memory Card of at least 2 GB. The standard CPU supplies 6 MB of program work memory, whereas the fail-safe CPU supplies 9 MB and adds the safety runtime boundary; they must not be treated as electrically or programmatically interchangeable records.
| Technical Item | 6ES7518-4AX00-1AC0 | 6ES7518-4FX00-1AC0 |
|---|---|---|
| Brand | Siemens | |
| Product Name | CPU 1518-4 PN/DP MFP bundle | CPU 1518F-4 PN/DP MFP bundle |
| Country | Germany | |
| Product Family | SIMATIC S7-1500 | SIMATIC S7-1500F |
| Base CPU | 6ES7518-4AX00-1AB0 | 6ES7518-4FX00-1AB0 |
| Safety Program | Standard CPU; no F-runtime | Fail-safe CPU with F-runtime |
| Bundle Software | C/C++ Runtime and OPC UA Runtime license | |
| Program Work Memory | 6 MB | 9 MB |
| Data Work Memory | 60 MB | |
| Memory Card | SIMATIC Memory Card required; 2 GB minimum | |
| PROFINET Interface 1 | IRT with integrated 2-port switch | |
| PROFINET Interface 2 | PROFINET RT | |
| Ethernet Interface 3 | PROFINET basic services | |
| Fieldbus Interface 4 | PROFIBUS | |
| Bit Operation Time | 1 ns typical | |
| Supply Voltage | 24 V DC | |
| Display and Controls | 6.1 cm display, 6 keys and mode selector | |
Configure Siemens 6ES7518-4AX00-1AC0 as the standard MFP CPU or Siemens 6ES7518-4FX00-1AC0 as the fail-safe MFP CPU; do not change only the displayed name. For the fail-safe model, include the F-hardware parameters, F-runtime checks and the approved safety program in the hardware configuration.
Compile the PLC project and the C/C++ component for Siemens 6ES7518-4AX00-1AC0 / 6ES7518-4FX00-1AC0 as distinct deliverables. Load the controller project, deploy the MFP application, verify the required runtime licenses and confirm that the memory card holds the intended versions before starting the plant sequence.
Record the firmware, TIA Portal project, C/C++ build, OPC UA configuration and memory-card image used by Siemens 6ES7518-4AX00-1AC0 / 6ES7518-4FX00-1AC0. On the fail-safe model, preserve the F-signature and repeat the required acceptance checks whenever a safety-relevant change is introduced.
Use the IRT-capable interface of Siemens 6ES7518-4AX00-1AC0 / 6ES7518-4FX00-1AC0 for time-critical PROFINET devices and confirm device names, topology and update timing. Keep this path distinct from higher-level traffic that does not require deterministic exchange.
Allocate PROFINET RT and basic Ethernet services on Siemens 6ES7518-4AX00-1AC0 / 6ES7518-4FX00-1AC0 according to the project network plan. Configure OPC UA endpoints, certificates and access on the selected interface, then test reachability without moving unrelated device traffic onto the same subnet.
Connect the PROFIBUS network to its dedicated interface on Siemens 6ES7518-4AX00-1AC0 / 6ES7518-4FX00-1AC0, preserve station addresses and termination, and compare online diagnostics with the installed bus order. A successful Ethernet download does not prove the independent PROFIBUS segment.
Siemens 6ES7518-4AX00-1AC0 / 6ES7518-4FX00-1AC0 have different hardware identities and safety capabilities. Replace the CPU in the hardware configuration deliberately, compile the complete standard and safety project, then resolve every device and F-runtime diagnostic before commissioning.
Use Siemens 6ES7518-4FX00-1AC0 when the documented project requires a fail-safe CPU and validated F-program execution. Siemens 6ES7518-4AX00-1AC0 is the standard MFP CPU and does not become fail-safe through software naming or an OPC UA license.
Verify that the included OPC UA Runtime license is recognized, the server or client is enabled, certificates are trusted and the endpoint is reachable on the intended interface of Siemens 6ES7518-4AX00-1AC0 / 6ES7518-4FX00-1AC0.
Keep time-critical PROFINET IRT on interface 1, assign PROFINET RT and basic services to their documented interfaces, and keep PROFIBUS on interface 4 for Siemens 6ES7518-4AX00-1AC0 / 6ES7518-4FX00-1AC0. This preserves diagnosable network boundaries.
Confirm the MFP runtime version, application deployment, allocated runtime memory and memory-card contents for Siemens 6ES7518-4AX00-1AC0 / 6ES7518-4FX00-1AC0. A valid PLC download does not automatically deploy the compiled C/C++ application.
Preserve the exact Siemens 6ES7518-4AX00-1AC0 / 6ES7518-4FX00-1AC0 article number, hardware configuration, firmware, memory-card image, interface assignments, C/C++ deployment, OPC UA certificates and any F-signature or safety acceptance records.
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