Preface 
 
CP 1542SP-1, CP 1542SP-1 IRC, CP 1543SP-1 
Operating Instructions, 01/2017, C79000-G8976-C426-03 
5 
Current manual release on the Internet 
You will also find the current version of this manual on the Internet pages of Siemens 
Industry Online Support under at the following addresses: 
●  CP 1542SP-1 / CP 1543SP-1 
Link: (https://support.industry.siemens.com/cs/ww/en/ps/22144/man) 
●  CP 1542SP-1 IRC 
Link: (https://support.industry.siemens.com/cs/ww/en/ps/22143/man) 
In this manual there are often cross references to other sections. 
To be able to return to the initial page after jumping to a cross reference, some PDF readers 
support the command <Alt>+<Left arrow>. 
Sources of information and other documentation 
You will find an overview of further reading and references in the Appendix of this manual. 
 
Note 
Open source software 
Read the license condit
ions for open source software carefully before using the product. 
You will find license conditions in the following document on the supplied data medium: 
●  OSS_CP-ET200SP_86.pdf 
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  
Link: (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