Preface 
 
SCALANCE M874, M876 
Operating Instructions, 06/2015, C79000-G8976-C331-05 
5 
The following and possibly other names not identified by the registered trademark sign 
®
 are 
registered trademarks of Siemens AG: 
SCALANCE, C-PLUG, KEY-PLUG 
Siemens provides products and solutions with industrial security functions that support the 
secure operation of plants, solutions, machines, equipment and/or networks. They are 
important components in a holistic industrial security concept. With this in mind, Siemens’ 
products and solutions undergo continuous development. Siemens recommends strongly 
that you regularly check for product updates. 
For the secure operation of Siemens products and solutions, it is necessary to take suitable 
preventive action (e.g. cell protection concept) and integrate each component into a holistic, 
state-of-the-art industrial security concept. Third-party products that may be in use should 
also be considered. For more information about industrial security, visit 
http://www.siemens.com/industrialsecurity. 
To stay informed about product updates as they occur, sign up for a product-specific 
newsletter. For more information, visit http://support.automation.siemens.com. 
 
Note 
Open source software 
Read the license
 conditions for open source software carefully before using the product. 
You will find license conditions in the following documents on the supplied data medium: 
●  DOC_OSS-SCALANCE-M_74.pdf 
●  DC_LicenseSummaryScalanceM87x_76.htm 
Explanations of many of the specialist terms used in this documentation can be found in the 
SIMATIC NET glossary. 
You will find the SIMATIC NET glossary here: 
●  SIMATIC NET Manual Collection or product DVD 
The DVD ships with certain SIMATIC NET products. 
●  On the Internet under the following entry ID: 
50305045 (http://support.automation.siemens.com/WW/view/en/50305045)