Siemens Simatic S7-1500 User manual

EQUIPMENT MANUAL
6ES7518-4AX00-1AB0
Edition
CPU 1518-4 PN/DP MFP
SIMATIC
S7-1500
11/2022
support.industry.siemens.com

Introduction 1
Safety instructions 2
Product overview 3
Connecting up 4
Interrupts, error messages,
diagnostics and system
alarms 5
Technical specifications 6
Dimensional drawing A
SIMATIC
S7-1500
CPU 1518-4 PN/DP MFP
(6ES7518-4AX00-1AB0)
Equipment Manual
11/2022
A5E40882737-AC

Siemens AG
Digital Industries
Postfach 48 48
90026 NÜRNBERG
GERMANY
A5E40882737-AC
Ⓟ 10/2022 Subject to change
Copyright © SiemensAG 2017 - 2022.
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.
Trademarks
All names identified by ® are registered trademarks of SiemensAG. The remaining trademarks in this publication
may be trademarks whose use by third parties for their own purposes could violate the rights of the owner.
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.

4
1 Introduction........................................................................................................................................ 5
1.1 Guide documentation S7-1500/ET 200MP......................................................................... 6
1.1.1 Information classes S7-1500/ET 200MP............................................................................. 6
1.1.2 SIMATIC Technical Documentation.................................................................................... 7
2 Safety instructions.............................................................................................................................. 10
2.1 Security information......................................................................................................... 10
3 Product overview................................................................................................................................ 11
3.1 New functions.................................................................................................................. 11
3.2 Applications of the S7-1500 CPUs...................................................................................... 12
3.3 Hardware properties......................................................................................................... 21
3.4 Firmware functions........................................................................................................... 24
3.4.1 Quick start instructions for commissioning C/C++ Runtime................................................. 27
3.4.2 Supplied libraries for C/C++ Runtime ................................................................................. 32
3.5 Operating and display elements........................................................................................ 33
3.5.1 Front view of the CPU with the front panel........................................................................ 33
3.5.2 Front view of the CPU without front panel......................................................................... 35
3.5.3 Rear view of the CPU......................................................................................................... 36
3.6 Mode selector switch........................................................................................................ 36
4 Connecting up.................................................................................................................................... 37
5 Interrupts, error messages, diagnostics and system alarms.............................................................. 43
5.1 Status and error display of the CPU.................................................................................... 43
6 Technical specifications...................................................................................................................... 46
A Dimensional drawing.......................................................................................................................... 60
CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)
Equipment Manual, 11/2022, A5E40882737-AC
Table of contents

Introduction 1
Purpose of the documentation
This manual supplements the system manual of the S7‑1500 automation system / ET 200MP
distributed I/O system as well as the function manuals. This manual contains a description of
the module-specific information. The system-related functions are described in the system
manual. All system-spanning functions are described 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 handling of the product or on the section of the documentation to which particular
attention should be paid.
Recycling and disposal
For environmentally friendly recycling and disposal of your old equipment, contact a certified
electronic waste disposal company and dispose of the equipment according to the applicable
regulations in your country.
5
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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).
You can find catalogs for all automation and drive products on theInternet
(https://mall.industry.siemens.com).
1.1 Guide documentation S7-1500/ET 200MP
1.1.1 Information classes S7-1500/ET 200MP
The documentation for the SIMATIC S7-1500 automation system and the ET200MP
distributed I/O system is arranged into three areas.
This arrangement enables you to access the specific content you require. Changes and
supplements to the manuals are documented in a Product Information.
You can download the documentation free of charge from the Internet
(https://support.industry.siemens.com/cs/ww/en/view/109742691).
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.
Examples:
•Getting Started S7-1500
•S7-1500/ET 200MP System Manual
•Online help TIA Portal
Device information
Equipment manuals contain a compact description of the module-specific information, such
as properties, wiring diagrams, characteristics and technical specifications.
Examples:
•Equipment Manuals CPUs
•Equipment Manuals Interface Modules
•Equipment Manuals Digital Modules
•Equipment Manuals Analog Modules
•Equipment Manuals Communications Modules
•Equipment Manuals Technology Modules
•Equipment Manuals Power Supply Modules
6CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)
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Introduction
1.1 Guide documentation S7-1500/ET 200MP

General information
The function manuals contain detailed descriptions on general topics relating to the SIMATIC
S7-1500 and ET200MPsystems.
Examples:
•Function Manual Diagnostics
•Function Manual Communication
•Function Manual Motion Control
•Function Manual Web Server
•Function Manual Cycle and Response Times
•PROFINET Function Manual
•PROFIBUS Function Manual
Product Information
Changes and supplements to the manuals are documented in a Product Information. The
Product Information takes precedence over the device and system manuals.
You can find the latest Product Information on the S7-1500 and ET200MP systems on the
Internet (https://support.industry.siemens.com/cs/de/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).
1.1.2 SIMATIC Technical Documentation
Additional SIMATIC documents will complete your information. You can find these
documents and their use at the following links and QR codes.
The Industry Online Support gives you the option to get information on all topics. Application
examples support you in solving your automation tasks.
7
Introduction
1.1 Guide documentation S7-1500/ET 200MP
CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)
Equipment Manual, 11/2022, A5E40882737-AC

Overview of the SIMATIC Technical Documentation
Here you will find an overview of the SIMATIC documentation available in Siemens Industry
Online Support:
Industry Online Support International
(https://support.industry.siemens.com/cs/ww/en/view/109742705)
Watch this short video to find out where you can find the overview directly in Siemens
Industry Online Support and how to use Siemens Industry Online Support on your mobile
device:
Quick introduction to the technical documentation of automation products per
video (https://support.industry.siemens.com/cs/us/en/view/109780491)
YouTube video: Siemens Automation Products - Technical Documentation at a
Glance (https://youtu.be/TwLSxxRQQsA)
mySupport
With "mySupport" you can get the most out of your Industry Online Support.
Registration You must register once to use the full functionality of "mySupport". After registra
tion, you can create filters, favorites and tabs in your personal workspace.
Support requests Your data is already filled out in support requests, and you can get an overview of
your current requests at any time.
Documentation In the Documentation area you can build your personal library.
Favorites You can use the "Add to mySupport favorites" to flag especially interesting or fre
quently needed content. Under "Favorites", you will find a list of your flagged
entries.
Recently viewed
articles
The most recently viewed pages in mySupport are available under "Recently viewed
articles".
CAx data The CAx data area gives you access to the latest product data for your CAx or CAe
system. You configure your own download package with a few clicks:
• 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" on the Internet. (https://support.industry.siemens.com/My/ww/en)
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.
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Introduction
1.1 Guide documentation S7-1500/ET 200MP

You can find the application examples on the Internet.
(https://support.industry.siemens.com/cs/ww/en/ps/ae)
9
Introduction
1.1 Guide documentation S7-1500/ET 200MP
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Equipment Manual, 11/2022, A5E40882737-AC
10
Safety instructions 2
2.1 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 constitute one element of such a concept.
Customers are responsible for preventing unauthorized access to their plants, systems,
machines and networks. Such systems, machines and components should only be connected
to an enterprise network or the internet if and to the extent such a connection is necessary
and only when appropriate security measures (e.g. firewalls and/or network segmentation)
are in place.
For additional information on industrial security measures that may be implemented, please
visit (https://www.siemens.com/industrialsecurity).
Siemens' products and solutions undergo continuous development to make them more
secure. Siemens strongly recommends that product updates are applied as soon as they are
available and that the latest product versions are used. Use of product versions that are no
longer supported, and failure to apply the latest updates may increase customers' exposure to
cyber threats.
To stay informed about product updates, subscribe to the Siemens Industrial Security RSS
Feed visit (https://www.siemens.com/cert).

Product overview 3
3.1 New functions
This section contains an overview of the most important new firmware functions of the CPU
compared to the predecessor CPU (V2.9).
New functions of the CPU in firmware version V3.0
New functions Applications Customer benefits
Communication of the CPU
Network Management Protocol
SNMP
A simple configuration option is available for
using the SNMP services. For new configura
tions, this is disabled by default in terms of
"Security-by-Default".
Can be enabled/disabled in the CPU proper
ties. Community strings can be configured.
OPC UA server – Reading the
diagnostic status of the own
address space
By using the OPC UA instruction for reading
("OPC_UA_ReadList"), the own namespace of
the OPC UA Server can be accessed.
This allows you to read out the following
statuses and react to them in the user program:
• Status of the own OPC UA server
• Status of the connections of OPCUA clients
• Status of the session
• Status of subscriptions
This allows connection problems to be
quickly detected, for example, and plant
availability to be increased.
OPC UA server – Time stamping
of the source time of nodes
By using the OPC UA instruction for writing
("OPC_UA_WriteList") it is possible to change
the "SourceTimestamp" as well as the status
code of an OPC UA variable (node).
Distinction between the "source" and "serv
er" time possible
OPC UA server – Increase of the
quantity structures
The following quantity structures have been
increased:
• Possible number of nodes in the server
interface
• Maximum possible number of subscriptions
per session
• For subscription, the recommendation for
observed values was increased.
Further applications for CPUs as OPC UA
servers
Web server of the CPU
New Web API methods: Many new API methods extend your access
options to the CPU via the Web API.
Additional applications for the web server
Dynamic management of certi
ficates
The web server certificate for HTTPS communic
ation can now also be managed via the OPC UA
GDS mechanism, without separate download of
the hardware configuration.
Flexible certificate management
11
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New functions Applications Customer benefits
Allow data access only via Web
API
They limit the functionality of the web server to
the web API based functions. This means that
only encrypted communication via HTTPS is
possible.
Higher security of communication via web
server
Technology functions of the CPU
Save absolute encoder adjustment for device
replacement
Saving the adjustment values with the
"MC_SaveAbsoluteEncoderData" instruc
tion saves having to perform the absolute
encoder adjustment again after a device
replacement.
The "MC_Home" instruction supports the new
"Incremental encoder adjustment" homing
mode.
Extended scope of functions
Active homing of absolute encoders is possible. Extended scope of functions
The "MC_Power" instruction supports coasting-
down.
Extended scope of functions "MC_Power"
instruction
The hardware limit switches are configurable as
traversable/non-traversable.
Extended scope of functions
For axes in a synchronous system, the dynamic
filter enables dynamic adaptation of axes with
higher dynamic responses to the axis with the
lowest dynamic response.
With the dynamic filter, axes with different
inertia can be adjusted to each other.
Optimization of a synchronous system
Axis functions
Stop superimposed movements on the axis
with the instruction "MC_HaltSuperimposed"
Use the instruction to stop a superimposed
motion independently of the basic motion.
The S7-1500 CPU supports up to 64 configured
signals per trace.
Number of configurable signals per traceTrace functionality of the CPU
Long-term trace: The S7-1500 CPU supports the
cycle-granular recording of up to 64 different
tags in a .csv file for a long time (hours, days,
etc.)
Better diagnostic possibilities when analyz
ing the course of signals over a long period
of time
Reference
You can find an overview of all new functions, improvements and revisions in the respective
firmware versions on the Internet
(https://support.industry.siemens.com/cs/ww/en/view/109478459).
3.2 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.
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Product overview
3.2 Applications of the S7-1500 CPUs

SIMATIC S7-1500 is the cost-effective and convenient solution for a broad range of tasks and
offers the following advantages:
•Modular, fanless design
•Simple realization of distributed structures
•User-friendly handling
Areas of application of the SIMATIC S7-1500 automation system include, 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
Areas of application of the SIMATIC S7‑1500R/H redundant system include, for example:
•Tunnels
•Airports (e.g. baggage conveyors)
•Subways
•Shipbuilding
•Wastewater treatment plants
•High-bay warehouses
Areas of application of the SIMATIC S7-1500T automation system for advanced motion
control applications include, for example:
•Packaging machines
•Converting applications
•Assembly automation
•Pick-and-place automation
•Palletizers
You can choose between CPUs with various levels of performance and a comprehensive
range of modules with many convenient functions. 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 suitability due to the high resistance to EMC, shock and vibration enable
universal use of the SIMATIC S7-1500, S7-1500R/H and S7-1500T automation systems.
13
Product overview
3.2 Applications of the S7-1500 CPUs
CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)
Equipment Manual, 11/2022, A5E40882737-AC

Performance segments of standard 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 3-1Standard CPUs
CPU Performance segment PROFIBUS
interfaces
PROFINET
IO RT/IRT
interfaces
PROFINET
IO RT inter
face
Basic
PROFINET
functional
ity
Work memory Pro
cessing
time for
bit opera
tions
CPU1511‑1PN Standard CPU for small to
mid-range applications
-- 1 -- -- 1.8MB 25ns
CPU1513‑1PN Standard CPU for mid-
range applications
-- 1 -- -- 3.1MB 25ns
CPU1515‑2PN Standard CPU for mid-
range to large applica
tions
-- 1 1 -- 5.5MB 6ns
CPU1516‑3
PN/DP
Standard CPU for high-
end applications and
communication tasks
1 1 1 -- 9.5MB 6ns
CPU1517‑3
PN/DP
Standard CPU for high-
end applications and
communication tasks
1 1 1 -- 10MB 2ns
CPU1518‑4
PN/DP
Standard CPU for high-
performance applica
tions, demanding com
munication tasks and
very short reaction times
1 1 1 1 66MB 1ns
CPU1518‑4PN/
DP MFP
Standard CPU for high-
performance applica
tions, demanding com
munication tasks, very
short reaction times and
C/C++ blocks for the user
program
1 1 1 1 116*MB 1ns
* 50MB of the integrated work memory is reserved for the function library of CPU runtime
Performance segments of redundant CPUs
The CPUs of the S7-1500R/H redundant system offer a high degree of reliability and system
availability. A redundant configuration of the most important automation components
reduces the likelihood of production downtimes and the consequences of component errors.
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Product overview
3.2 Applications of the S7-1500 CPUs

The higher the risks and costs of a production downtime, the more worthwhile the use of a
redundant system. The avoidance of production downtimes compensates for the generally
higher investment costs.
Table 3-2Redundant CPUs
CPU Performance segment PROFIBUS
interfaces
PROFINET
IO RT/IRT
interfaces
PROFINET
IO RT inter
face
Basic
PROFINET
functional
ity
Work memory Pro
cessing
time for
bit opera
tions
CPU1513R‑1PN Redundant CPU for smal
ler to mid-range applica
tions
-- 1 -- -- 3.1MB 50ns
CPU 1515R-2 PN Redundant CPU for mid-
range to large applica
tions
-- 1 -- 1 5.5MB 20ns
CPU 1517H-3 PN Redundant CPU for
demanding applications
and communication tasks
-- 1 -- 1 10MB 4ns
CPU 1518HF-4 PN Fail-safe and redundant
CPU for demanding
applications and commu
nication tasks
-- 1 -- 2 69 MB 4 ns
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.
Table 3-3Compact CPUs
CPU Performance segment PROFIBUS
interfaces
PROFINET
IO RT/IRT
interfaces
PROFINET
IO RT inter
face
Basic
PROFINET
functional
ity
Work memory Pro
cessing
time for
bit opera
tions
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
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 meters 6 (max. 100 kHz) 6 (max. 100 kHz)
Period duration measurement 6 channels 6 channels
15
Product overview
3.2 Applications of the S7-1500 CPUs
CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)
Equipment Manual, 11/2022, A5E40882737-AC

CPU1511C‑1PN CPU1512C‑1PN
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
Performance segments of technology CPUs
The technology CPUs can be used for low and mid-range applications, as well as for the high-
end range of machine and plant automation. Because of their extended motion control
functions, they are primarily used for drive control.
Table 3-4Technology CPUs
CPU Performance segment PROFIBUS
interfaces
PROFINET
IO RT/IRT
interfaces
PROFINET
IO RT inter
face
Basic
PROFINET
functional
ity
Work
memory
Processing
time for bit
operations
CPU 1511T-1 PN Technology CPU for small
to mid-range applications
-- 1 -- -- 1.95MB 25ns
CPU 1515T-2 PN Technology CPU for mid-
range to large applica
tions
-- 1 1 -- 6MB 6ns
CPU1516T‑3PN/
DP
Technology CPU for high-
end applications and
communication tasks
1 1 1 -- 10.5 MB 6 ns
CPU1517T-3
PN/DP
Technology CPU for high-
end applications and
communication tasks
1 1 1 -- 11MB 2ns
CPU 1518T-4
PN/DP
Technology CPU for high-
performance motion con
trol applications with
large quantities,
demanding communica
tion tasks and very short
reaction times
1 1 1 1 69 MB 1ns
CPU1511TF‑1PN
CPU1515TF‑2PN
CPU1516TF‑3P
N/DP
CPU1517TF-3
PN/DP
CPU 1518TF-4
PN/DP
These CPUs are described in the fail-safe CPUs.
Performance segments of fail-safe CPUs
The fail-safe CPUs are intended for users who want to implement demanding standard and
fail-safe applications both centrally and decentrally.
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Product overview
3.2 Applications of the S7-1500 CPUs

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13849-1:2015 or EN
ISO13849-1:2015
Additional password protection for F-configuration and F-program is set up for IT security.
Table 3-5Fail-safe CPUs
CPU Performance segment PROFIBUS
interfaces
PROFINET
IO RT/IRT
interfaces
PROFINET
IO RT inter
face
Basic
PROFINET
functional
ity
Work memory Pro
cessing
time for
bit opera
tions
CPU1511F‑1 PN Fail-safe CPU for smaller
to medium-sized applica
tions
-- 1 -- -- 1.95MB 25ns
CPU1511TF‑1PN Fail-safe technology CPU
for small to mid-range
applications
-- 1 -- -- 1.95MB 25ns
CPU1513F‑1 PN Fail-safe CPU for
medium-sized applica
tions
-- 1 -- -- 3.4MB 25ns
CPU1515F‑2 PN Fail-safe CPU for
medium-sized to large
applications
-- 1 1 -- 6MB 6ns
CPU1515TF‑2PN Fail-safe technology CPU
for high-end applications
and communication tasks
-- 1 1 -- 6MB 6ns
CPU1516F‑3
PN/DP
Fail-safe CPU for
demanding applications
and communications
tasks
1 1 1 -- 10.5MB 6ns
CPU1516TF‑3P
N/DP
Fail-safe technology CPU
for high-end applications
and communication tasks
1 1 1 -- 10.5 MB 6 ns
CPU1517F‑3
PN/DP
Fail-safe CPU for
demanding applications
and communications
tasks
1 1 1 -- 11MB 2ns
CPU1517TF-3
PN/DP
Fail-safe technology CPU
for high-end applications
and communication tasks
1 1 1 -- 11MB 2ns
* 50MB of the integrated work memory is reserved for the function library of CPU runtime
17
Product overview
3.2 Applications of the S7-1500 CPUs
CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)
Equipment Manual, 11/2022, A5E40882737-AC

CPU Performance segment PROFIBUS
interfaces
PROFINET
IO RT/IRT
interfaces
PROFINET
IO RT inter
face
Basic
PROFINET
functional
ity
Work memory Pro
cessing
time for
bit opera
tions
CPU1518F‑4
PN/DP
Fail-safe CPU for high-
performance applica
tions, demanding com
munication tasks and
very short reaction times
1 1 1 1 69MB 1ns
CPU 1518F-4
PN/DP MFP
Fail-safe CPU for high-
performance applica
tions, demanding com
munication tasks, very
short reaction times and
C/C++ blocks for the user
program
1 1 1 1 119*MB 1ns
CPU 1518TF-4
PN/DP
Technology CPU for high-
performance motion con
trol applications with
large quantities,
demanding communica
tion tasks and very short
reaction times
1 1 1 1 69 MB 1ns
* 50MB of the integrated work memory is reserved for the function library of CPU runtime
In addition to the CPUs, further components such as SINAMICS drives dispose of integrated
safety functions. Additional information about integrated safety functions in drives can be
found in the manuals for the respective products.
Power segment of the CPU 1518-4 PN/DP MFP
The CPU 1518-4 PN/DP MFP can be used for the high-end area of machine and plant
automation.
The CPU 1518-4 PN/DP MFP offers you the following options:
•Executing STEP 7 blocks of the "standard" user program
•Executing applications that were programmed in C/C++ with the Open Development Kit
ODK
–Run C/C++ code synchronously in the CPU cycle via the CPU function library
–Run C/C++ applications as separate applications parallel to CPU runtime
The CPU 1518-4 PN/DP MFP is suitable for:
•Complex protocol connections according to IEC 61850 and SECS/GEM
•Database connections, for example, SQL databases
•Data preprocessing for preparing complex data, for example, for management decisions
•Executing complex algorithms, for example, for optimizing processes
18 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)
Equipment Manual, 11/2022, A5E40882737-AC
Product overview
3.2 Applications of the S7-1500 CPUs

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Figure 3-1Overview of the performance segment
You create the C/C++ blocks (CPU function library for CPU Runtime) and C/C++-Runtime
applications with the "Open Development Kit ODK 1500S" (ODK).
Employing the ODK enables you to use mechanisms from high-level programming languages
(e.g. object-based) within a modern programming environment.
NOTE
To be able to use SIMATIC Industrial OS from firmware version V2.8.4 onwards, use the Open
Development Kit 1500S Version V2.5 SP2 or higher. More information about the Open
Development Kit 1500S Version V2.5 SP2 can be found on the Internet
(https://support.industry.siemens.com/cs/ww/en/view/109782540).
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
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
19
Product overview
3.2 Applications of the S7-1500 CPUs
CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)
Equipment Manual, 11/2022, A5E40882737-AC

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. 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 into the 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 SIMATIC S7-1500 ODK 1500S
(https://support.industry.siemens.com/cs/ww/en/ps/13914/man) Programming and Operating
Manual, V2.5 and higher, edition12/2017. The sections that describe the CPU function library
for CPU Runtime and the C/C++ Runtime applications apply to the CPU 1518-4 PN/PN/DP MFP.
The work memory and the load memory of the CPU 1518-4 PN/DP MFP are divided as follows:
Work memory for:
•The STEP 7 user program
•for CPU function library for CPU Runtime
•for C/C++ Runtime applications
Load memory for:
•the STEP 7 user program including CPU function library for CPU Runtime
•for C/C++ Runtime applications
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.
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. Detailed
information about this and a multitude of other display functions is available in the SIMATIC
S7-1500 Display Simulator
(https://support.industry.siemens.com/cs/ww/de/view/109761758/en).
20 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)
Equipment Manual, 11/2022, A5E40882737-AC
Product overview
3.2 Applications of the S7-1500 CPUs