Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP – 6ES7518-4AP00-0AB0

The Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP (6ES7518-4AP00-0AB0) is a high-performance programmable logic controller designed for demanding industrial automation, machine control and manufacturing applications. As part of the Siemens SIMATIC S7-1500 automation platform, this CPU provides powerful processing capabilities, extensive work memory and multiple communication interfaces for integrating industrial equipment into complex automation systems.

With 6 MB of work memory for programs and 60 MB for data, the CPU is suitable for applications requiring substantial control logic, data handling and communication capabilities. Its specified bit operation performance is 1 ns, making it a powerful option for automation projects that require fast instruction processing.

The CPU includes four communication interfaces: PROFINET IRT with an integrated two-port switch, a second PROFINET RT interface, an Ethernet interface and a PROFIBUS interface. This combination supports integration with compatible industrial networks and automation devices, subject to the application configuration and supported communication functions.

Key Product Features

• Manufacturer: Siemens

• Product family: SIMATIC S7-1500

• CPU model: CPU 1518-4 PN/DP

• Order number: 6ES7518-4AP00-0AB0

• Product type: Standard PLC CPU

• Program work memory: 6 MB

• Data work memory: 60 MB

• First interface: PROFINET IRT with integrated two-port switch

• Second interface: PROFINET RT

• Third interface: Ethernet

• Fourth interface: PROFIBUS

• Specified bit performance: 1 ns

• Rated supply voltage: 24 V DC

• Permissible supply voltage: 19.2–28.8 V DC

• Memory requirement: Compatible SIMATIC Memory Card required

• Engineering environment: Siemens STEP 7 in TIA Portal; verify the appropriate software and firmware versions

High-Performance Processing

The CPU 1518-4 PN/DP is designed for demanding industrial control applications that require fast processing and significant memory capacity. Its 6 MB program work memory supports complex control programs, while the 60 MB data work memory provides resources for application data and other supported control functions.

The specified 1 ns bit operation performance highlights the CPU's processing capability. Actual application performance depends on program structure, communication traffic, configured hardware and the requirements of the overall automation system.

PROFINET IRT Communication

The first integrated interface supports PROFINET IRT and includes a two-port switch. This enables communication with compatible industrial automation devices over a PROFINET network and supports suitable network configurations.

PROFINET communication can be used to integrate distributed I/O, operator panels, drives and other compatible automation equipment. Network design and configuration should follow the relevant Siemens documentation and the requirements of the connected devices.

Additional PROFINET RT Interface

The second interface supports PROFINET RT communication and offers additional networking options for compatible automation systems. Depending on the system architecture, separate interfaces can help organize connections between PLCs and other industrial devices.

Before implementation, check the supported network topology, addressing, communication configuration and device compatibility.

Ethernet Interface

The third interface provides Ethernet connectivity for supported communication and integration requirements. The functions available through this interface depend on the CPU configuration, firmware and applicable Siemens documentation.

Confirm the required communication services before integrating the controller into an existing network.

Integrated PROFIBUS Interface

The fourth interface supports PROFIBUS communication, helping connect compatible devices in automation installations that use PROFIBUS-based networks. This can be useful when maintaining or upgrading existing industrial systems that combine newer PROFINET equipment with legacy PROFIBUS devices.

Check the connected equipment, network configuration and supported communication functions before installation.

TIA Portal Programming and Configuration

The Siemens CPU 1518-4 PN/DP is engineered using Siemens STEP 7 in TIA Portal. The required engineering software version depends on the CPU firmware and project requirements. Siemens documentation lists TIA Portal V13 or later for earlier supported firmware and V17 for firmware V2.9.

Always verify the exact firmware version, engineering software compatibility and project requirements before configuring or programming the CPU.

SIMATIC Memory Card Requirement

A compatible SIMATIC Memory Card is required for CPU operation. The memory card is used for load memory and related supported functions. Confirm whether the memory card is included in the product offer before ordering, as accessories can vary between suppliers and product packages.

Industrial Applications

The Siemens CPU 1518-4 PN/DP may be suitable for a wide range of industrial automation applications, including:

• Large-scale factory automation

• Complex manufacturing systems

• Automated production lines

• Packaging and processing machinery

• Conveyor and material-handling systems

• Textile and garment manufacturing equipment

• Food and beverage processing

• Water treatment and utility automation

• Industrial pump and compressor systems

• Machine-building and OEM automation projects

• Distributed I/O control systems

• PROFINET and PROFIBUS network integration

• Industrial equipment maintenance and PLC replacement projects

The suitability of this CPU depends on the application requirements, available hardware, engineering configuration and supported communication functions.

Technical Specifications

Important Product Status Information

Siemens lists 6ES7518-4AP00-0AB0 as a cancelled product. This model may be relevant for existing installations, maintenance, repair or replacement requirements. Availability should be confirmed before ordering.

For new projects or system upgrades, consult Siemens or an authorised automation specialist about the recommended replacement. Before replacing the CPU, verify the hardware configuration, firmware, engineering software, communication interfaces and project compatibility.

Why Choose PLC Mart BD?

PLC Mart BD helps customers identify Siemens PLCs and industrial automation components using their exact manufacturer part numbers. Providing the complete order number makes it easier to confirm the correct product version and check compatibility with an existing automation system.

When enquiring about this product, provide the exact order number 6ES7518-4AP00-0AB0. Confirm current availability, product condition, warranty, included accessories and delivery arrangements before placing an order.

Ordering Checklist

• Verify the complete Siemens order number.

• Confirm availability and product condition.

• Check compatibility with the existing SIMATIC S7-1500 system.

• Confirm the required TIA Portal and firmware versions.

• Ensure a compatible SIMATIC Memory Card is available.

• Verify the PROFINET, Ethernet and PROFIBUS communication requirements.

• For replacement projects, review the existing PLC program and hardware configuration before installation.

Product Summary: The Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP, part number 6ES7518-4AP00-0AB0, is a high-performance standard PLC CPU with 6 MB program work memory, 60 MB data work memory, PROFINET IRT, PROFINET RT, Ethernet and PROFIBUS interfaces. A compatible SIMATIC Memory Card is required. Siemens lists this model as cancelled, so confirm availability before purchasing.