Preface - Siemens 6ES7521-1BL00-0AA0 Manual

Preface

Purpose of the documentation
This manual supplements the S7-1500/ET 200MP
(https://support.industry.siemens.com/cs/ww/en/view/59191792) system manual.
Functions that relate in general to the systems are described in this system manual.
The information provided in this manual and in the system/function manuals supports you in
commissioning the systems.
Changes compared to previous version
Compared to the previous version, this manual contains the following change:
Schematic circuit diagram has been updated.
Conventions
The term "CPU" is used in this manual both for the CPUs of the S7-1500 automation system
and for interface modules of the ET 200MP distributed I/O system.
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.
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).
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Digital input module DI 32x24VDC BA (6ES7521-1BL10-0AA0)
Manual, 12/2016, A5E32363711-AD