Documentation references   
A.4 On programming (blocks, OPC) 
  CP 443-1 Advanced (GX30) 
120  Manual, 03/2019, C79000-G8976-C256-05 
 
Documentation package "STEP 7 Basic Knowledge" 
●  Working with STEP 7 Getting Started (ID: 18652511) 
●  Programming with STEP 7 (ID: 18652056) 
●  Configuring Hardware and Connections with STEP 7 (ID: 18652631) 
●  From S5 to S7, Converter Manual (ID: 1118413) 
Siemens AG 
Order number 6ES7 810-4CA08-8AW0 
(part of the online documentation in STEP 7) 
 
On programming (blocks, OPC) 
A.4.1
 
SIMATIC NET 
Program blocks for SIMATIC NET S7 CPs 
Programming Manual 
Siemens AG 
Link: (https://support.industry.siemens.com/cs/ww/en/view/30564821) 
 
SIMATIC NET 
Version history of the SIMATIC NET program blocks for S7 CPs 
Reference manual 
Siemens AG 
Link: (https://support.industry.siemens.com/cs/ww/en/view/9836605) 
 
SIMATIC 
Programming with STEP 7 
Siemens AG 
(Part of the STEP 7 documentation package STEP 7 Basic Knowledge) 
(Part of the online documentation in STEP 7) 
Link: (https://support.industry.siemens.com/cs/ww/en/view/18652056)