Basics of program execution
10.4 Special instructions for S7-1500R/H redundant systems
S7-1500R/H redundant system
332 System Manual, 01/2024, A5E41814787-AF
10.4.2 Determining the primary CPU with "RH_GetPrimaryID"
You use the "RH_GetPrimaryID" instruction to read out which CPU is currently the primary
CPU. The instruction outputs the redundancy ID of the primary CPU at the Ret_Val block
parameter.
Figure 10-4 "RH_GetPrimaryID" instruction
Example: Reading maintenance information from the SIMATIC memory card of the primary CPU
Proceed as follows to read specific maintenance information from the SIMATIC memory card
of the primary CPU:
1. Get the redundancy ID of the primary CPU with "RH_GetPrimaryID".
2. Read the maintenance information from the SIMATIC memory card of the primary CPU with
"GetSMCInfo".
– If the CPU with redundancy ID 1 is the primary CPU, enter "12" at the Mode block
parameter ("1" for redundancy ID, "2" for maintenance information).
– If the CPU with redundancy ID 2 is the primary CPU, enter "22" at the Mode block
parameter ("2" for redundancy ID, "2" for maintenance information).
Reference
You can find more information on the "RH_GetPrimaryID" instruction in the STEP 7 online
help.
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