Siemens SIMATIC IPC327G User manual

SIMATIC IPC327G
SIMATIC
Industrial PC
SIMATIC IPC327G
Operating Instructions
09/2021
A5E
51366275-AA
Preface
Overview
1
Safety instructions
2
Installing and connecting
the device
3
Commissioning the device
and device functions
4
Expanding and assigning
parameters to the device
5
Maintaining and repairing
the device
6
Technical specifications
7
Technical support
A
Markings and symbols
B
List of abbreviations
C

Siemens AG
Digital Industries
Postfach 48 48
90026 NÜRNBERG
GERMANY
A5E51366275-AA
Ⓟ
09/2021 Subject to change
Copyright © Siemens AG 2021.
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.

SIMATIC IPC327G
Operating Instructions, 09/2021, A5E51366275-AA 3
Preface
Preface
These operating instructions contain all the information you need for commissioning and
operation of the SIMATIC IPC327G.
It is intended both for programming and testing personnel who commission the device and
connect it with other units (automation systems, programming devices), as well as for service
and maintenance personnel who install add-ons or carry out fault/error analyses.
Basic knowledge requirements
A solid background in personal computers and Microsoft operating systems is required to
understand this manual. General knowledge in the field automation control engineering is
recommended.
Validity of the operating instructions
These operating instructions are valid for all versions of the SIMATIC IPC327G.
The updates of the document will be published on the Siemens Industry Online Support
(https://support.industry.siemens.com/cs/ww/en/view/109744171).
Scope of this documentation
The documentation for the SIMATIC IPC327G consists of:
•Product information "Important notes on your device"
•SIMATIC IPC327G Quick Install Guide
•SIMATIC IPC327G Operating Instructions in English, German, Chinese and Japanese
If you ordered the device with an operating system, the documentation is supplied on the
USB stick in PDF format (in multiple languages).
Conventions
The terms "PC" and "device" are sometimes used to refer to the SIMATIC IPC327G in this
documentation.
Instead of the specific names of the operating system, we are using the abbreviation
"Windows 10" throughout.

Preface
SIMATIC IPC327G
4Operating Instructions, 09/2021, A5E51366275-AA
History
The following editions of these operating instructions have been published:
Edition
Comment
09/2021
First edition

SIMATIC IPC327G
Operating Instructions, 09/2021, A5E51366275-AA 5
Table of contents
Preface ................................................................................................................................................... 3
1 Overview................................................................................................................................................ 8
1.1 Product description.............................................................................................................. 8
1.1.1 Overview............................................................................................................................. 8
1.1.2 Configuration plan............................................................................................................... 9
1.2 Structure of the devices ..................................................................................................... 10
1.2.1 Views of the device............................................................................................................ 10
1.2.2 Interfaces of the device...................................................................................................... 11
1.2.3 Status displays................................................................................................................... 12
1.3 Accessories........................................................................................................................ 13
2 Safety instructions............................................................................................................................... 14
2.1 General safety instructions................................................................................................. 14
2.2 Security information .......................................................................................................... 16
2.3 Data protection.................................................................................................................. 17
2.4 Disclaimer for third-party software updates........................................................................ 17
2.5 Notes on use ..................................................................................................................... 17
3 Installing and connecting the device .................................................................................................. 18
3.1 Preparing for installation.................................................................................................... 18
3.1.1 Checking the delivery package ........................................................................................... 18
3.1.2 Identification data of the device ......................................................................................... 20
3.1.3 Permitted mounting positions ............................................................................................ 21
3.2 Mounting the device.......................................................................................................... 21
3.2.1 Mounting instructions........................................................................................................ 21
3.2.2 Mounting on a standard rail............................................................................................... 23
3.2.3 Wall mounting ................................................................................................................... 24
3.3 Connecting the device ....................................................................................................... 25
3.3.1 Notes on connecting.......................................................................................................... 25
3.3.2 Connecting the function earth ........................................................................................... 26
3.3.3 Connecting the power supply............................................................................................. 28
3.3.4 Connect device to networks ............................................................................................... 29
4 Commissioning the device and device functions ................................................................................ 31
4.1 General information on commissioning.............................................................................. 31
4.2 Switching the device on/off................................................................................................ 31
5 Expanding and assigning parameters to the device ........................................................................... 33
5.1 Open the device ................................................................................................................ 33
5.2 Installing the M.2 Module .................................................................................................. 34

Table of contents
SIMATIC IPC327G
6Operating Instructions, 09/2021, A5E51366275-AA
5.3 Installing and removing M.2 NVMe/ SATA SSD.................................................................... 37
6 Maintaining and repairing the device ................................................................................................. 39
6.1 Maintenance intervals........................................................................................................ 39
6.2 Repair information............................................................................................................. 39
6.3 Installing and removing hardware...................................................................................... 41
6.3.1 Replacing the backup battery ............................................................................................. 41
6.3.2 Replacing the memory module .......................................................................................... 43
6.4 Reinstalling the operating system....................................................................................... 46
6.4.1 Installing the drivers and software ..................................................................................... 46
6.5 Recycling and disposal ....................................................................................................... 49
7 Technical specifications....................................................................................................................... 50
7.1 Certificates and approvals.................................................................................................. 50
7.2 Directives and declarations ................................................................................................ 54
7.2.1 Electromagnetic compatibility, Industrial and Residential Areas .......................................... 54
7.2.2 RoHS directive ................................................................................................................... 54
7.2.3 ESD guideline .................................................................................................................... 54
7.3 Dimension drawings .......................................................................................................... 57
7.3.1 Dimension drawing of device............................................................................................. 57
7.4 Technical data ................................................................................................................... 59
7.4.1 General technical specifications ......................................................................................... 59
7.4.2 Ambient conditions ........................................................................................................... 62
7.4.3 Power demand of the components..................................................................................... 63
7.4.4 Direct current supply (DC).................................................................................................. 63
7.5 Hardware descriptions ....................................................................................................... 64
7.5.1 Technical features of the motherboard............................................................................... 64
7.5.2 External interfaces ............................................................................................................. 65
7.5.2.1 Overview of external interfaces.......................................................................................... 65
7.5.2.2 USB 3.1 port ...................................................................................................................... 65
7.5.2.3 DC in connector ................................................................................................................. 65
7.5.2.4 Ethernet port..................................................................................................................... 66
7.5.2.5 DisplayPort ........................................................................................................................ 66
7.5.2.6 Serial interface .................................................................................................................. 67
7.5.3 Internal interfaces.............................................................................................................. 68
7.5.3.1 Overview of internal interfaces .......................................................................................... 68
7.5.3.2 M.2 interface..................................................................................................................... 69
7.5.3.3 USB 2.0 pin header ............................................................................................................ 71
7.5.3.4 USB 2.0 port ...................................................................................................................... 71
7.5.4 System resources............................................................................................................... 71
7.5.4.1 Currently allocated system resources ................................................................................. 71
7.5.5 Input/output address areas................................................................................................. 72
7.5.5.1 Overview of the internal module registers.......................................................................... 72
7.5.5.2 Watchdog control register.................................................................................................. 72
7.5.5.3 Watchdog counter register................................................................................................. 73
7.5.5.4 Watchdog state register..................................................................................................... 73
7.5.5.5 Battery status register........................................................................................................ 73
7.6 BIOS description ................................................................................................................ 74

Table of contents
SIMATIC IPC327G
Operating Instructions, 09/2021, A5E51366275-AA 7
7.6.1 Overview........................................................................................................................... 74
7.6.2 BIOS update....................................................................................................................... 75
7.6.3 Alarm, error and system messages ..................................................................................... 76
A Technical support ................................................................................................................................ 77
A.1 Service and support ........................................................................................................... 77
A.2 Troubleshooting ................................................................................................................ 78
A.3 Notes on the use of third-party modules............................................................................. 79
B Markings and symbols......................................................................................................................... 80
B.1 Overview........................................................................................................................... 80
B.2 Safety................................................................................................................................ 80
B.3 Operator controls............................................................................................................... 80
B.4 Certificates, approvals and markings .................................................................................. 81
B.5 Interfaces .......................................................................................................................... 82
C List of abbreviations ............................................................................................................................ 83
C.1 Abbreviations .................................................................................................................... 83
Glossary ............................................................................................................................................... 86
Index .................................................................................................................................................... 94

SIMATIC IPC327G
8Operating Instructions, 09/2021, A5E51366275-AA
Overview
1
1.1 Product description
1.1.1 Overview
SIMATIC IPC327G provides high-level industrial functionality:
•Compact design
•Scalability
•High degree of ruggedness
•Various interfaces
•Maintenance-free operation possibility

Overview
1.1 Product description
SIMATIC IPC327G
Operating Instructions, 09/2021, A5E51366275-AA 9
1.1.2 Configuration plan
Mounting
The device supports the following two mounting types:
•Standard (Wall mounting)
•Mounting on a standard rail
Chipset
•Intel Atom® x6000E series
Processor •Intel Atom® x6413E Processor (up to 3.0 GHz)
Main memory
Memory expansion up to 16 GB with the following memory modules:
•4G DDR4 SDRAM
•8G DDR4 SDRAM
•16G DDR4 SDRAM
The max speed of memory is up to 3200 MT/s.
The processor supports IBECC (In-Band-Error-Correction-Code), and its default value in BIOS is "Disable".
Expandability
•2 × M.2 Key B connector
Graphics •Intel® UHD Graphics
Power supply
•24 V DC (19.2 to 28.8 V)
Trusted Platform Module
(TPM) •Without TPM
•TPM 2.0
Drives and storage media
M.2 NVMe/SATA SSD •Without drive
•256GB Eco SSD
•512GB Eco SSD
M.2 Module
•Support 2 × M.2 Module on the motherboard
Interfaces
Ethernet
•2 × RJ45 Ethernet 10/100/1000 Mbps
COM
•2 × RS232/RS422/RS485 1(switchable), D-sub connector, 9-pin
COM (optional)
•2× RS232 (optional), max. 115 Kbps, D-sub connector, 9-pin
USB (external)
•4 × USB 3.1 Gen2 (up to 10 Gb/s)
USB (internal)
•1 × USB pin header to USB 2.0 ports
USB dongle (internal)
•1 × USB 2.0 type A connector
DisplayPort
•Connection of a digital monitor, support DisplayPort Standard Version 1.4
•2 × DP++ 2, support resolution up to 4096 × 2160 pixels at 60 Hz
SIM card slot (internal)
•1 × SIM card slot
Keyboard, mouse
Connection through USB port
Audio (optional)
Connection for analog audio source and speaker
Operating systems
Operation Systems
•Without OS
•Windows 10 Enterprise 2019 LTSC (Long Term Servicing Channel) 64-bit (MUI) 3

Overview
1.2 Structure of the devices
SIMATIC IPC327G
10 Operating Instructions, 09/2021, A5E51366275-AA
1
In the BIOS setup, you can configure support of RS232/RS422/RS485 for each COM port.
2
DP++ is a DisplayPort Dual-Mode, and it supports HDMI/DP signal output.
3
MUI: Multi-language user interface; More language packages are available on the USB
stick. You can install them according to your request.
1.2 Structure of the devices
1.2.1 Views of the device
Front view and side view
The front view on the left is the standard mounting position. The side view is on the right.
①
Cooling fins
②
LED displays
③
Mounting holes for wall mounting

Overview
1.2 Structure of the devices
SIMATIC IPC327G
Operating Instructions, 09/2021, A5E51366275-AA 11
Bottom view
①
Function earth connection
②
Interfaces
1.2.2 Interfaces of the device
①
Power supply
Connection for a 24 V DC power supply
②
Audio (optional)
Connection for analog audio source and speaker
③
USB 3.1 port (X60/X61)
2 × USB 3.1 port, high current
④
DPP (X70/X71)
2 × DisplayPort connection
⑤
LAN (X1P1/X2P1)
2 × RJ45 Ethernet connections for 10/100/1000 Mbps
⑥
USB 3.1 port (X62/X63)
2 × USB 3.1 port, high current
⑦
COM (Optional)
2 × Serial interface, 9-pin RS232 D-sub connector
⑧
COM (X30/X31)
2 × Serial interface, 9-pin RS232/RS422/RS485 D-sub connector
⑨
Function earth
Connection for function earth
⑩
On/Off switch
Switch on; Switch off

Overview
1.2 Structure of the devices
SIMATIC IPC327G
12 Operating Instructions, 09/2021, A5E51366275-AA
1.2.3 Status displays
LED
State
Description
PWR
Off
Unplugged
Green
BIOS ready to boot
Flashing green/yellow
(1 Hz)
BIOS in POST, power switch on
Orange
Switched off or in S4/S5 state
Flashing red (1 Hz)
Watchdog is active
HDD
Off
Not accessing data
Green flashing
Accessing data
Example programs for controlling the LEDs on Windows operating systems are available on
the Siemens Industry Automation and Drive Technology
(https://support.industry.siemens.com/cs/us/en/)

Overview
1.3 Accessories
SIMATIC IPC327G
Operating Instructions, 09/2021, A5E51366275-AA 13
1.3 Accessories
Accessories from Siemens are available for your device. These are not included in the scope
of delivery.
Additional accessories can be found on the Internet:
•Industry Mall (https://mall.industry.siemens.com)
•Expansion components and accessories (https://w3.siemens.com/mcms/pc-based-
automation/en/industrial-pc/expansion_components_accessories)
Accessories available for order
Accessories
Article number
M.2 Key B to Key E adapter
6ES7648-1AA50-0XR0
Dust protection set
6ES7648-1AA50-0XG0
Lithium battery
A5E48370874
Dust protection set
The Dust protection set interfaces contains:
•40 pieces covers for USB interface
•20 pieces covers for RJ45 Ethernet connection
•10 pieces DisplayPort cover

SIMATIC IPC327G
14 Operating Instructions, 09/2021, A5E51366275-AA
Safety instructions
2
2.1 General safety instructions
WARNING
Life-threatening voltages are present with an open control cabinet
When you install the device in a control cabinet, some areas or components in the open
control cabinet might be carrying life-threatening voltages.
If you touch these areas or components, you might be killed by electric shock.
Switch off the power supply to the cabinet before opening it.
WARNING
The installer of the system is responsible for the safety of a system in which the device
is integrated
There is a risk of malfunction which could result in death or serious injury.
•Ensure that only suitably qualified personnel perform the work.
WARNING
The equipment is designed for operation with Safety Extra-Low Voltage (SELV) or
Protective Extra-Low Voltage (PELV).
This means that electrical circuit in which the voltage cannot exceed 30 V AC (RMS), 42.4 V
AC peak or 60 V DC under NORMAL CONDITIONS and CONDITIONS OF A SINGLE FAULT,
including ground faults in other circuits.
System expansions
NOTICE
Damage through system expansions
Device and system expansions might be faulty and can affect the entire machine or plant.
The installation of expansions can damage the device, machine or plant. Device and system
expansions can violate safety rules and regulations regarding radio interference
suppression. If you install or exchange system expansions and damage your device, the
warranty becomes void.

Safety instructions
2.1 General safety instructions
SIMATIC IPC327G
Operating Instructions, 09/2021, A5E51366275-AA 15
Note the following for system expansions:
•Only install system expansion devices designed for this device. Contact your technical
support team or where you purchased your PC to find out which system expansion devices
can safely be installed.
•Comply with the Electromagnetic compatibility, Industrial and Residential Areas (Page 54)
requirements.
WARNING
Risk of fire through expansion cards
Expansion cards generate additional heat. The device might overheat and cause a fire.
Note the following:
•Observe the safety and installation instructions for the expansion cards.
•Install the device in an enclosure that meets the requirements of paragraph 9.3.2 of the
IEC/UL/EN/DIN-EN 61010-2-201 standard.
NOTICE
Open Equipment
When the device is used in the area of Industrial Control Equipment in accordance with
UL61010-2-201, the device is classified as "Open equipment".
Open equipment must be installed within an enclosure which protects you from hazards,
including mechanical hazards, electrical shock and spread of fire.
Battery
WARNING
Risk of explosion and release of harmful substances
Improper handling of lithium batteries can result in an explosion of the batteries.
Explosion of the batteries and the released pollutants can cause severe physical injury. Worn
batteries jeopardize the function of the device.
Note the following when handling lithium batteries:
•Replace used batteries in good time; see the section "Replacing the backup battery
(Page 41)" in the operating instructions.
•Replace the lithium battery only with an identical battery or types recommended by
SIEMENS (article number: A5E48370874).
•For any requirements on product maintenance, contact Siemens Service and support
(Page 77).
•Do not throw lithium batteries into fire, do not solder on the cell body, do not recharge,
do not open, do not short-circuit, do not reverse polarity, do not heat above 100°C and
protect from direct sunlight, moisture and condensation.

Safety instructions
2.2 Security information
SIMATIC IPC327G
16 Operating Instructions, 09/2021, A5E51366275-AA
High frequency radiation
NOTICE
Observe immunity to radio frequency (RF) radiation
The device has an increased immunity to RF radiation according to the specifications on
electromagnetic compatibility in the technical specifications.
Radiation exposure in excess of the specified immunity limits can impair device functions,
result in malfunctions and therefore injuries or damages.
Read the information on immunity to RF radiation in the technical specifications.
Unintentional operating situations
High frequency radiation, for example, from a cellular phone, may interfere with device
functions and can cause malfunctions resulting in personal injury or material damage.
Avoid high-frequency radiation:
•Remove radiation sources from the environment of the device.
•Switch off radiating devices.
•Reduce the radio output of radiating devices.
•Please observe the information on electromagnetic compatibility in the technical
specifications.
ESD Guideline
Label electrostatic sensitive devices with the ESD symbol.
NOTICE
Electrostatic sensitive devices (ESD)
When you touch electrostatic sensitive components, you can destroy them through voltages
that are far below the human perception threshold.
If you work with components that can be destroyed by electrostatic discharge, observe the
ESD guideline (Page 54).
2.2 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

Safety instructions
2.3 Data protection
SIMATIC IPC327G
Operating Instructions, 09/2021, A5E51366275-AA 17
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/industrialsecurity).
2.3 Data protection
Siemens observes the data protection guidelines, especially the requirements regarding data
minimization (privacy by design). This means the following for this SIMATIC product: The
product does not process / save any personal information, but only technical functional data
(e.g. time stamps). If the user links this data to other data (e.g. shift plans) or if the user saves
personal information on the same medium (e.g. hard disk) and therefore creates a personal
reference in the process, the user has to ensure meeting the guidelines regarding data
protection.
2.4 Disclaimer for third-party software updates
This product includes third-party software. Siemens AG only provides a warranty for
updates/patches of the third-party software, if these have been distributed as part of a
Siemens software update service contract or officially released by Siemens AG. Otherwise,
updates/patches are undertaken at your own risk. You can find more information about our
Software Update Service offer on the Internet at Software Update Service
(https://new.siemens.com/us/en.html).
2.5 Notes on use
NOTICE
Possible functional restrictions in case of non-validated plant operation
The device is tested and certified on the basis of the technical standards. In rare cases,
functional restrictions can occur during plant operation.
Validate the correct functioning of the plant to avoid functional restrictions.

SIMATIC IPC327G
18 Operating Instructions, 09/2021, A5E51366275-AA
Installing and connecting the device
3
3.1 Preparing for installation
3.1.1 Checking the delivery package
Procedure
1. When accepting a delivery, check the packaging for visible transport damage.
2. If any transport damage is present at the time of delivery, lodge a complaint at the shipping
company in charge. Have the shipper confirm the transport damage immediately.
3. Unpack the device at its installation location.
4. Keep the original packaging in case you have to transport the unit again.
5. Check the contents of the packaging and any accessories you ordered for completeness and
damage.
Note
Damage to the device during transport and storage
If a device is transported or stored without packaging, shocks, vibrations, pressure and
moisture may impact the unprotected unit. A damaged packaging indicates that ambient
conditions have already had an impact on the device.
The device might be damaged.
Do not dispose of the original packaging. Pack the device during transportation and
storage.

Installing and connecting the device
3.1 Preparing for installation
SIMATIC IPC327G
Operating Instructions, 09/2021, A5E51366275-AA 19
6. If the contents of the packaging are incomplete, damaged or do not match your order,
inform the responsible delivery service immediately.
WARNING
Electric shock and fire hazard due to damaged device
A damaged device can be under hazardous voltage and trigger a fire in the machine or
plant. A damaged device has unpredictable properties and states.
Death or serious injury could occur.
•Make sure that the damaged device is not installed or put into operation.
•Label the damaged device and keep it locked away.
•Send off the device for immediate repair.
NOTICE
Damage from condensation
If the device is subjected to low temperatures or extreme fluctuations in temperature
during transportation, for example in cold weather, moisture could build up on or inside
the device.
Moisture causes a short circuit in electrical circuits and damages the device.
In order to prevent damage to the device, proceed as follows:
•Operate and store the device in a dry location.
•Bring the device to room temperature before starting it up.
•Do not expose the device to direct heat radiation from a heating device.
•If condensation develops, wait approximately 12 hours or until the device is
completely dry before switching it on.
7. Keep the enclosed documentation in a safe place. You need the documentation when you
commission the device for the first time or meet other problems in the later work.
8. Record the identification data of the device.

Installing and connecting the device
3.1 Preparing for installation
SIMATIC IPC327G
20 Operating Instructions, 09/2021, A5E51366275-AA
3.1.2 Identification data of the device
The device can be clearly identified with the help of this identification data in case of repairs
or theft.
Enter the identification data in the following table:
Identification data
Source
Value
Serial number
Product label
S VP ...
Order number
Product label
6AG4022-0B...
Production version
Product label
FS
Microsoft Windows Product Key
Certificate of Authenticity (COA)
Back of the device
Only devices with preinstalled
Windows operating systems
have COA labels
Ethernet address 1 (MAC)
Product label
Ethernet address 2 (MAC)
Product label
The following image shows the product label on the SIMATIC IPC327G as an example.
COA label
Microsoft Windows "Product Key" on the "Certificate Of Authenticity" (COA):
The COA label is only attached to the rear of the device containing a preinstalled and
activated Windows operating system.
•COA label of a device with Windows operating system