Siemens S7-1500 Manual page 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).
Open Source Software
Open-source software is used in the firmware of the I/O modules. Open Source Software is
provided free of charge. We are liable for the product described, including the open-source
software contained in it, pursuant to the conditions applicable to the product. Siemens
accepts no liability for the use of the open source software over and above the intended
program sequence, or for any faults caused by modifications to the software.
For legal reasons, we are obliged to publish the original text of the license conditions and
copyright notices. Please read the information relating to this on the Internet
(https://support.industry.siemens.com/cs/ww/en/view/109741045).
Digital input module DI 16x24...125VUC HF (6ES7521-7EH00-0AB0)
Manual, 12/2016, A5E35681478-AC
Preface
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