Siemens SIMATIC PCS 7 System Manual page 18

Configuring AS-OS communication
3.2 User Archive Read Manager
6. Compile the CFCs and download them to the AS.
7. Compile the OS.
Note
if you subsequently change the values for ID_1 / ID_2, you must perform one of the following
procedures:
● Perform a complete restart of the CPU (preferred)
● Re-instantiate the affected "FB_UA_RM" blocks in the CFC (= new data block), that
Therefore, the definition of ID_1 and ID_2 should be well thought out.
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means rewire from the old instances, delete the old ones, rename the new ones, then
perform an AS delta compile and download and an OS delta compile and download.
Advanced Process Functions Engineering Manual
System Manual, 07/2016, A5E38719921-AA