Preface   
 
  CP 1542SP-1, CP 1542SP-1 IRC, CP 1543SP-1 
6  Operating Instructions, 01/2017, C79000-G8976-C426-03 
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  
Link: (http://www.siemens.com/industrialsecurity). 
The firmware is signed and encrypted. This ensures that only firmware created by Siemens 
can be downloaded to the device. 
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 address: 
Link: (https://support.industry.siemens.com/cs/ww/en/view/50305045) 
Training, Service & Support 
You will find information on training, service and support in the multilanguage document 
"DC_support_99.pdf" on the Internet pages of Siemens Industry Online Support: 
Link: (https://support.industry.siemens.com/cs/ww/en/view/38652101)