Siemens Simatic S7-1500 User manual

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SIMATIC
S7-1500
CPU 1518-4 PN/DP MFP
(6ES7518-4AX00-1AB0)
Manual
12/2017
A5E40882737
-AA
Preface
Documentation guide
1
Product overview
2
Connecting up
3
Interrupts, error messages,
diagnostics and system
alarms
4
Technical specifications
5
Dimensional drawing
A

Siemens AG
Division Digital Factory
Postfach 48 48
90026 NÜRNBERG
GERMANY
A5E40882737-AA
Ⓟ
12/2017 Subject to change
Copyright © Siemens AG 2017.
All rights reserved
Legal information
Warning notice system
This manual contains notices you have to observe in order to ensure your personal safety, as well as to prevent
damage to property. The notices referring to your personal safety are highlighted in the manual by a safety alert
symbol, notices referring only to property damage have no safety alert symbol. These notices shown below are
graded according to the degree of danger.
DANGER
indicates that death or severe personal injury will result if proper precautions are not taken.
WARNING
indicates that death or severe personal injury may result if proper precautions are not taken.
CAUTION
indicates that minor personal injury can result if proper precautions are not taken.
NOTICE
indicates that property damage can result if proper precautions are not taken.
If more than one degree of danger is present, the warning notice representing the highest degree of danger will
be used. A notice warning of injury to persons with a safety alert symbol may also include a warning relating to
property damage.
Qualified Personnel
The product/system described in this documentation may be operated only by
personnel qualified
for the specific
task in accordance with the relevant documentation, in particular its warning notices and safety instructions.
Qualified personnel are those who, based on their training and experience, are capable of identifying risks and
avoiding potential hazards when working with these products/systems.
Proper use of Siemens products
Note the following:
WARNING
Siemens products may only be used for the applications described in the catalog and in the relevant technical
documentation. If products and components from other manufacturers are used, these must be recommended
or approved by Siemens. Proper transport, storage, installation, assembly, commissioning, operation and
maintenance are required to ensure that the products operate safely and without any problems. The permissible
ambient conditions must be complied with. The information in the relevant documentation must be observed.
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Disclaimer of Liability
We have reviewed the contents of this publication to ensure consistency with the hardware and software
described. Since variance cannot be precluded entirely, we cannot guarantee full consistency. However, the
information in this publication is reviewed regularly and any necessary corrections are included in subsequent
editions.

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Preface
Purpose of the documentation
This manual supplements the system manual of the S7-1500 automation system and the
function manuals. All cross-system functions are described in the system manual and in the
function manuals.
The information provided in this manual and the system manual enables you to commission
the CPU 1518-4 PN/DP MFP.
Basic knowledge required
To understand this documentation, you need to have general knowledge of automation
engineering. You also need basic knowledge of the following topics:
●Knowledge of the industrial automation system SIMATIC
●Knowledge of working with STEP 7
●Knowledge of working with Linux systems
●Knowledge of programming with C/C++
●Working with the Eclipse development environment
Conventions
●STEP 7: In this documentation, "STEP 7" is used as a synonym for all versions of the
configuration and programming software "STEP 7 (TIA Portal)".
●
ODK
: Open Development Kit
●
SO:
Shared Object
●
MFP
: Multifunctional platform
Please also observe notes marked as follows:
Note
A note contains important information on the product described in the documentation, on the
ha
ndling of the product or on the section of the documentation to which particular attention
should be paid.

Preface
CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)
Manual, 12/2017, A5E40882737-AA 5
Security information
Siemens provides products and solutions with industrial security functions that support the
secure operation of plants, systems, machines and networks.
In order to protect plants, systems, machines and networks against cyber threats, it is
necessary to implement – and continuously maintain – a holistic, state-of-the-art industrial
security concept. Siemens’ products and solutions only form one element of such a concept.
Customer is responsible to prevent unauthorized access to its plants, systems, machines
and networks. Systems, machines and components should only be connected to the
enterprise network or the internet if and to the extent necessary and with appropriate security
measures (e.g. use of firewalls and network segmentation) in place.
Additionally, Siemens’ guidance on appropriate security measures should be taken into
account. For more information about industrial security, please visit
(http://www.siemens.com/industrialsecurity).
Siemens’ products and solutions undergo continuous development to make them more
secure. Siemens strongly recommends to apply product updates as soon as available and to
always use the latest product versions. Use of product versions that are no longer supported,
and failure to apply latest updates may increase customer’s exposure to cyber threats.
To stay informed about product updates, subscribe to the Siemens Industrial Security RSS
Feed under (http://www.siemens.com/industrialsecurity).
Siemens Industry Online Support
You can find current information on the following topics quickly and easily here:
●
Product support
All the information and extensive know-how on your product, technical specifications,
FAQs, certificates, downloads, and manuals.
●
Application examples
Tools and examples to solve your automation tasks – as well as function blocks,
performance information and videos.
●
Services
Information about Industry Services, Field Services, Technical Support, spare parts and
training offers.
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Forums
For answers and solutions concerning automation technology.
●
mySupport
Your personal working area in Industry Online Support for messages, support queries,
and configurable documents.
This information is provided by the Siemens Industry Online Support in the Internet
(https://support.industry.siemens.com).

Preface
CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)
6Manual, 12/2017, A5E40882737-AA
Industry Mall
The Industry Mall is the catalog and order system of Siemens AG for automation and drive
solutions on the basis of Totally Integrated Automation (TIA) and Totally Integrated Power
(TIP).
Catalogs for all the products in automation and drives are available on the Internet
(https://mall.industry.siemens.com).

CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)
Manual, 12/2017, A5E40882737-AA 7
Table of contents
Preface ................................................................................................................................................... 4
1 Documentation guide .............................................................................................................................. 8
2 Product overview .................................................................................................................................. 12
2.1 Applications of the S7-1500 CPUs .........................................................................................12
2.2 Hardware properties ...............................................................................................................21
2.3 Firmware functions..................................................................................................................23
2.3.1 Quick start instructions for commissioning C/C++ Runtime ...................................................28
2.3.2 Supplied libraries for C/C++ Runtime .....................................................................................31
2.4 Operating and display elements .............................................................................................32
2.4.1 Front view of the CPU with the front panel .............................................................................32
2.4.2 Front view of the CPU without front panel ..............................................................................34
2.4.3 Rear view of the CPU .............................................................................................................35
2.5 Mode selector switch ..............................................................................................................35
3 Connecting up....................................................................................................................................... 36
4 Interrupts, error messages, diagnostics and system alarms................................................................... 42
4.1 Status and error display of the CPU .......................................................................................42
5 Technical specifications ........................................................................................................................ 45
A Dimensional drawing............................................................................................................................. 59

CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)
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Documentation guide
1
The documentation for the SIMATIC S7-1500 automation system and the SIMATIC
ET 200MP distributed I/O system is arranged into three areas.
This arrangement enables you to access the specific content you require.
Basic information
The System Manual and Getting Started describe in detail the configuration, installation,
wiring and commissioning of the SIMATIC S7-1500 and ET 200MP systems. The STEP 7
online help supports you in the configuration and programming.
Device information
Product manuals contain a compact description of the module-specific information, such as
properties, wiring diagrams, characteristics and technical specifications.

Documentation guide
CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)
Manual, 12/2017, A5E40882737-AA 9
General information
The function manuals contain detailed descriptions on general topics regarding the SIMATIC
S7-1500 and ET 200MP systems, e.g. diagnostics, communication, motion control, Web
server, OPC UA.
You can download the documentation free of charge from the Internet
(http://w3.siemens.com/mcms/industrial-automation-systems-simatic/en/manual-
overview/Pages/Default.aspx).
Changes and supplements to the manuals are documented in a Product Information.
You can download the product information free of charge from the Internet
(https://support.industry.siemens.com/cs/us/en/view/68052815).
Manual Collection S7-1500/ET 200MP
The Manual Collection contains the complete documentation on the SIMATIC S7-1500
automation system and the ET 200MP distributed I/O system gathered together in one file.
You can find the Manual Collection on the Internet
(https://support.industry.siemens.com/cs/ww/en/view/86140384).
SIMATIC S7-1500 comparison list for programming languages
The comparison list contains an overview of which instructions and functions you can use for
which controller families.
You can find the comparison list on the Internet
(https://support.industry.siemens.com/cs/ww/en/view/86630375).
"mySupport"
With "mySupport", your personal workspace, you make the best out of your Industry Online
Support.
In "mySupport", you can save filters, favorites and tags, request CAx data and compile your
personal library in the Documentation area. In addition, your data is already filled out in
support requests and you can get an overview of your current requests at any time.
You must register once to use the full functionality of "mySupport".
You can find "mySupport" on the Internet (https://support.industry.siemens.com/My/ww/en).
"mySupport" - Documentation
In the Documentation area in "mySupport" you can combine entire manuals or only parts of
these to your own manual.
You can export the manual as PDF file or in a format that can be edited later.
You can find "mySupport" - Documentation on the Internet
(http://support.industry.siemens.com/My/ww/en/documentation).

Documentation guide
CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)
10 Manual, 12/2017, A5E40882737-AA
"mySupport" - CAx data
In the CAx data area in "mySupport", you can access the current product data for your CAx
or CAe system.
You configure your own download package with a few clicks.
In doing so you can select:
●Product images, 2D dimension drawings, 3D models, internal circuit diagrams, EPLAN
macro files
●Manuals, characteristics, operating manuals, certificates
●Product master data
You can find "mySupport" - CAx data on the Internet
(http://support.industry.siemens.com/my/ww/en/CAxOnline).
Application examples
The application examples support you with various tools and examples for solving your
automation tasks. Solutions are shown in interplay with multiple components in the system -
separated from the focus on individual products.
You will find the application examples on the Internet
(https://support.industry.siemens.com/sc/ww/en/sc/2054).
TIA Selection Tool
With the TIA Selection Tool, you can select, configure and order devices for Totally
Integrated Automation (TIA).
This tool is the successor of the SIMATIC Selection Tool and combines the known
configurators for automation technology into one tool.
With the TIA Selection Tool, you can generate a complete order list from your product
selection or product configuration.
You can find the TIA Selection Tool on the Internet
(http://w3.siemens.com/mcms/topics/en/simatic/tia-selection-tool).

Documentation guide
CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)
Manual, 12/2017, A5E40882737-AA 11
SIMATIC Automation Tool
You can use the SIMATIC Automation Tool to perform commissioning and maintenance
activities simultaneously on various SIMATIC S7 stations as a bulk operation independent of
the TIA Portal.
General function overview:
●Network browsing and creation of a table showing the accessible devices in the network.
●Flashing of device LEDs or HMI display to locate a device
●Downloading of addresses (IP, subnet, gateway) to a device
●Downloading the PROFINET name (station name) to a device
●Placing a CPU in RUN or STOP mode
●Setting the time in a CPU to the current time of your PG/PC
●Downloading a new program to a CPU or an HMI device
●Downloading from CPU, downloading to CPU or deleting recipe data from a CPU
●Downloading from CPU or deleting data log data from a CPU
●Backup/restore of data from/to a backup file for CPUs and HMI devices
●Downloading service data from a CPU
●Reading the diagnostics buffer of a CPU
●Performing a CPU memory reset
●Resetting devices to factory settings
●Downloading a firmware update to a device
You can find the SIMATIC Automation Tool on the Internet
(https://support.industry.siemens.com/cs/ww/en/view/98161300).
PRONETA
With SIEMENS PRONETA (PROFINET network analysis), you analyze the PROFINET
network during commissioning. PRONETA features two core functions:
●The topology overview independently scans PROFINET network and all connected
components.
●The IO check is a fast test of the wiring and the module configuration of a system.
You can find SIEMENS PRONETA on the Internet
(https://support.industry.siemens.com/cs/ww/en/view/67460624).

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Product overview
2
2.1
Applications of the S7-1500 CPUs
Application
SIMATIC S7-1500 is the modular control system for a wide variety of automation
applications in discrete automation.
The modular and fanless design, simple implementation of distributed structures, and user-
friendly operation make SIMATIC S7-1500 the economic and convenient solution for a
variety of tasks.
Application areas of the SIMATIC S7-1500 are, for example:
●Special-purpose machines
●Textile machinery
●Packaging machines
●General mechanical engineering
●Controller engineering
●Machine tool engineering
●Installation engineering
●Electrical industry and crafts
●Automobile engineering
●Water/waste water
●Food & Beverage
Application areas of the SIMATIC S7-1500T are, for example:
●Packaging machines
●Converting application
●Assembly automation
Several CPUs with various levels of performance and a comprehensive range of modules
with many convenient features are available. Fail-safe CPUs enable use in fail-safe
applications. The modular design allows you to use only the modules that you need for your
application. The controller can be retrofitted with additional modules at any time to expand its
range of tasks.
High industrial capability from the high resistance to EMC, shock and vibration enable
universal use of the SIMATIC S7-1500.

Product overview
2.1 Applications of the S7-1500 CPUs
CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)
Manual, 12/2017, A5E40882737-AA 13
Performance segments of the standard, compact, fail-safe and technology CPUs
The CPUs can be used for smaller and mid-range applications, as well as for the high-end
range of machine and plant automation.
Table 2- 1 Standard CPUs
CPU
Performance segment
PROFIBUS
interfaces
PROFINET
IO RT/IRT
interfaces
PROFINET
IO RT
interface
Basic
PROFINET
functionality
Work memory
Pro-
cessing
time for bit
operations
CPU 1511-1 PN Standard CPU for small to
mid-range applications
-- 1 -- -- 1.15 MB 60 ns
CPU 1513-1 PN Standard CPU for mid-
range applications
-- 1 -- -- 1.8 MB 40 ns
CPU 1515-2 PN Standard CPU for small to
mid-range applications
-- 1 1 -- 3.5 MB 30 ns
CPU 1516-3
PN/DP
Standard CPU for high-end
applications and communi-
cation tasks
1 1 1 -- 6 MB 10 ns
CPU 1517-3
PN/DP
Standard CPU for high-end
applications and communi-
cation tasks
1 1 1 -- 10 MB 2 ns
CPU 1518-4
PN/DP
CPU 1518-4
PN/DP MFP
Standard CPU for high-
performance applications,
demanding communication
tasks and very short reac-
tion times
1 1 1 1 24 MB 1 ns

Product overview
2.1 Applications of the S7-1500 CPUs
CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)
14 Manual, 12/2017, A5E40882737-AA
Table 2- 2 Compact CPUs
CPU
Performance segment
PROFIBUS
interfaces
PROFINET
IO RT/IRT
interfaces
PROFINET
IO RT
interface
Basic
PROFINET
functionality
Work memory
Pro-
cessing
time for bit
operations
CPU 1511C-1 PN Compact CPU for small to
mid-range applications
-- 1 -- -- 1.175 MB 60 ns
CPU 1512C-1 PN Compact CPU for mid-
range applications
-- 1 -- -- 1.25 MB 48 ns
Table 2- 3 Fail-safe CPUs
CPU
Performance segment
PROFIBUS
interfaces
PROFINET
IO RT/IRT
interfaces
PROFINET
IO RT
interface
Basic
PROFINET
functionality
Work memory
Pro-
cessing
time for bit
operations
CPU 1511F-1 PN Fail-safe CPU for smaller
to medium-sized applica-
tions
-- 1 -- -- 1.225 MB 60 ns
CPU 1511TF-1
PN
Fail-safe technology CPU
for small to mid-range
applications
-- 1 -- -- 1.225 MB 60 ns
CPU 1513F-1 PN Fail-safe CPU for medium-
sized applications
-- 1 -- -- 1.95 MB 40 ns
CPU 1515F-2 PN Fail-safe CPU for medium-
sized to large applications
-- 1 1 -- 3.75 MB 30 ns
CPU 1515TF-2
PN
Fail-safe technology CPU
for complex applications
and communication tasks
-- 1 1 -- 3.75 MB 30 ns
CPU 1516F-3
PN/DP
Fail-safe CPU for demand-
ing applications and com-
munications tasks
1 1 1 -- 6.5 MB 10 ns
CPU 1516TF-3
PN/DP
Fail-safe technology CPU
for complex applications
and communication tasks
1 1 1 -- 6.5 MB 10 ns
CPU 1517F-3
PN/DP
Fail-safe CPU for demand-
ing applications and com-
munications tasks
1 1 1 -- 11 MB 2 ns
CPU 1517TF-3
PN/DP
Fail-safe technology CPU
for complex applications
and communication tasks
1 1 1 -- 11 MB 2 ns
CPU 1518F-4
PN/DP
CPU 1518F-4
PN/DP MFP
Fail-safe CPU for high-
performance applications,
demanding communication
tasks and very short reac-
tion times
1 1 1 1 26 MB 1 ns

Product overview
2.1 Applications of the S7-1500 CPUs
CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)
Manual, 12/2017, A5E40882737-AA 15
Table 2- 4 Technology CPUs
CPU
Performance segment
PROFIBUS
interfaces
PROFINET
IO RT/IRT
interfaces
PROFINET
IO RT
interface
Basic
PROFINET
functionality
Work memory
Pro-
cessing
time for bit
operations
CPU 1511T-1 PN Technology CPU for small
to mid-range applications
-- 1 -- -- 1.225 MB 60 ns
CPU 1515T-2 PN Technology CPU for mid-
range to large applications
-- 1 1 -- 3.75 MB 30 ns
CPU 1516T-3
PN/DP
Technology CPU for high-
end applications and
communication tasks
1 1 1 -- 6.5 MB 10 ns
CPU 1517T-3
PN/DP
Technology CPU for high-
end applications and
communication tasks
1 1 1 -- 11 MB 2 ns
CPU 1511TF-1
PN
CPU 1515TF-2
PN
CPU 1516TF-3
PN/DP
CPU 1517TF-3
PN/DP
These CPUs are described in the fail-safe CPUs (see table Fail-safe CPUs)

Product overview
2.1 Applications of the S7-1500 CPUs
CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)
16 Manual, 12/2017, A5E40882737-AA
Performance segment of the CPU 1518-4 PN/DP MFP
The CPU can be used for the high-end area of machine and plant automation.
CPU 1518-4 PN/DP MFP can execute both STEP 7 blocks of the "usual" user program, as
well as blocks and applications that have been programmed with C/C++.
The multifunctional platform enables you to execute C/C++ code synchronously in the CPU
cycle (through the CPU function library). In addition, the multifunctional platform can run
C/C++ applications as separate applications parallel to CPU Runtime.
Figure 2-1 Overview of the performance segment
You create the C/C++ blocks (CPU function library for CPU Runtime) and C/C++ Runtime
applications with the "ODK 1500S Open Development Kit" (ODK).
Employing the ODK enables you to use mechanisms from high-level programming
languages (e.g. object-based) within a modern programming environment.
With ODK, you program:
●Blocks in C/C++ that can be run synchronously in the execution cycle of the CPU (CPU
function library for CPU Runtime)
●C/C++ Runtime applications running in SIMATIC S7-1500 MFP C/C++ Runtime,
independent of the STEP 7 user program

Product overview
2.1 Applications of the S7-1500 CPUs
CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)
Manual, 12/2017, A5E40882737-AA 17
You can use C/C++ Runtime applications to implement parallel processes to the STEP 7
user program, for example, for pre-processing or transmitting data via Industrial Ethernet. A
CPU can simultaneously perform more tasks, the complexity of functions is reduced and the
time required for implementation decreased.
You can reuse existing C/C++ algorithms. In order to continue using existing technological
know-how, you can integrate the existing C/C++ code via the Open Development Kit:
●In the runtime environment of the CPU or
●As C/C++ Runtime applications in SIMATIC S7-1500 MFP C/C++ Runtime
Once you integrate the C/C++ sources, you can execute them on the CPU.
You can find a description of the Open Development Kit in the S7-1500 Programming and
Operating Manual Open Development Kit 1500S, as of V2.5 Edition 12/2017. The sections
that describe the CPU function library for CPU Runtime and die C/C++ Runtime applications
apply to CPU 1518-4 PN/DP MFP.
CPU 1518-4 PN/DP MFP has additional memory for C/C++ code and data:
Work memory for:
●The STEP 7 user program
●The CPU function library for CPU Runtime
●C/C++ Runtime applications
Load memory for:
●The STEP 7 user program including CPU function library for CPU Runtime
●C/C++ Runtime applications
Performance segments of compact CPUs
The compact CPUs can be used for smaller to mid-range applications and have an
integrated analog and digital on-board I/O as well as integrated technology functions. The
following table shows the specific properties of the Compact CPUs.
CPU 1511C-1 PN
CPU 1512C-1 PN
Integrated analog inputs/outputs
5 inputs/2 outputs
5 inputs/2 outputs
Integrated digital inputs/outputs 16 inputs/16 outputs 32 inputs/32 outputs
High-speed counters
6
6
Frequency meter
6 (max. 100 kHz)
6 (max. 100 kHz)
Period duration measurement
6 channels
6 channels
Pulse width modulation (PWM output)
max. 4 (up to 100 kHz)
max. 4 (up to 100 kHz)
Pulse Train Output (PTO output)
max. 4 (up to 100 kHz)
max. 4 (up to 100 kHz)
Frequency output
up to 100 kHz
up to 100 kHz

Product overview
2.1 Applications of the S7-1500 CPUs
CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)
18 Manual, 12/2017, A5E40882737-AA
Integrated Motion Control technology functions
All CPUs of SIMATIC S7-1500
support Motion Control technology functions. STEP 7 offers
Motion Control instructions standardized according to PLCopen for configuring and
connecting a drive to the CPU.
S7-1500 Motion Control supports the following technology objects:
●Speed-controlled axis
●Positioning axis
●Synchronous axis
●External encoders
●Output cam
●Cam track
●Measuring input
The technology CPUs of the SIMATIC S7-1500
offer enhanced Motion Control functions:
●Advanced synchronization functions
–Synchronization with specification of synchronous position
–Actual value coupling
–Shifting of the master value at following axis
–Camming
●Up to 4 encoders or measuring systems as actual position for position control
The technology CPUs of the SIMATIC S7-1500
additionally support the following technology
objects: – Cam – Kinematics
●Cam
●Kinematics
●Control of kinematics, such as
–Cartesian portals
–Role picker
–Delta picker
–SCARA
Due to the supported technology functions, the S7-1500T CPUs are suitable for controlling
packaging machines, converting applications, assembly automation, etc.
Additional integrated technology functions
For effective commissioning, diagnostics and fast optimization of drives and controls, the
SIMATIC S7-1500 controller family offers extensive trace functions for all CPU tags.
In addition to drive integration, the SIMATIC S7-1500 has a PID compact closed-loop
controller; easy-to-configure blocks allow automatic optimization of the controller parameters
for optimized control quality.

Product overview
2.1 Applications of the S7-1500 CPUs
CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)
Manual, 12/2017, A5E40882737-AA 19
Other technology functions
Technology modules also implement functions such as high-speed counting, position
detection, measuring functions and pulse generators (PTO, PWM and frequency output). For
compact CPU 1511C-1 PN and CPU 1512C-1 PN CPUs, these functions are already
integrated and can be implemented without additional technology modules.
SIWAREX is a versatile and flexible weighing module which you can use as a static scale for
operation.
Security Integrated
In conjunction with STEP 7, each CPU offers password-based know-how protection against
unauthorized reading out or modification of the program blocks.
Copy protection provides reliable protection against unauthorized reproduction of program
blocks. With copy protection, individual blocks on the SIMATIC memory card can be tied to
its serial number so that the block can only be run if the configured memory card is inserted
into the CPU.
In addition, you can assign various access rights to different user groups in the controller
using four different authorization levels.
Improved manipulation protection allows changed or unauthorized transfers of engineering
data to be detected by the controller.
The use of an Ethernet CP (CP 1543-1) provides you with additional access protection
through a firewall or possibilities to establish secure VPN connections.
Safety Integrated
The fail-safe CPUs are intended for users who want to implement demanding standard and
fail-safe applications both centrally and decentrally.
These fail-safe CPUs allow the processing of standard and safety programs on a single
CPU. This allows fail-safe data to be evaluated in the standard user program. The integration
also provides the system advantages and the extensive functionality of SIMATIC for fail-safe
applications.
The fail-safe CPUs are certified for use in safety mode up to:
●Safety class (Safety Integrity Level) SIL 3 according to IEC 61508:2010
●Performance Level (PL) e and Category 4 according to ISO 13849-1:2006 or according to
EN ISO 13849-1:2008
Additional password protection for F-configuration and F-program is set up for IT security.

Product overview
2.1 Applications of the S7-1500 CPUs
CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)
20 Manual, 12/2017, A5E40882737-AA
Design and handling
All CPUs of the SIMATIC S7-1500 product series feature a display with plain text
information. The display provides the user with information on the order numbers, firmware
version, and serial number of all connected modules. In addition, the IP address of the CPU
and other network settings can be adapted locally without a programming device. Errors
messages are immediately shown on the display in plain text. When performing servicing,
you can minimize plant downtimes by quickly accessing the diagnostics messages. You can
find detailed information on these and all other options for the display in the SIMATIC S7-
1500 Display Simulator (http://www.automation.siemens.com/salesmaterial-as/interactive-
manuals/getting-started_simatic-s7-1500/disp_tool/start_en.html).
Uniform front connectors for all modules and integrated potential bridges for flexible
formation of potential groups simplifies storage. Additional components such as circuit
breakers, relays, etc., can be installed quickly and easily, since a DIN rail is implemented in
the rail of the S7-1500. The CPUs of the SIMATIC S7-1500 product series can be expanded
centrally and in a modular fashion with signal modules. Space-saving expansion enables
flexible adaptation to each application.
The system cabling for digital signal modules enables fast and clear connection to sensors
and actuators from the field (fully modular connection consisting of front connector modules,
connection cables and I/O modules), as well as easy wiring inside the control cabinet
(flexible connection consisting of front connectors with assembled single conductors).
System diagnostics and alarms
Integrated system diagnostics is activated by default for the CPUs. The different diagnostic
types are configured instead of programmed. System diagnostics information is shown
uniformly and in plain text on the display of the CPU, in STEP 7, on the HMI and on the Web
server, even for alarms related to drives. This information is available in RUN mode, but also
in STOP mode of the CPU. An automatic update of the diagnostics information is performed
when you configure new hardware components.
The CPU is available as a central interrupt server in up to three project languages. The HMI
takes over the display in the project languages defined for the CPU. If you require alarm
texts in additional languages, you can load them into your HMI via the configured
connection. The CPU, STEP 7 and your HMI ensure data consistency without additional
engineering steps. The maintenance work is easier.