Siemens SIMATIC S7-1500 Function Manual page 341

Communication with the redundant system S7-1500R/H
13.6 Open User Communication with the redundant system S7-1500R/H
TRCV_C instruction in the user program of the CPU 1516 3PN/DP
Create a TRCV_C instruction in the user program of the CPU 1516-3PN/DP and assign
parameters as below:
Figure 13-13 S7-1500-3PN/DP: Assigning parameters to the TRCV_C instruction in STEP 7
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Function Manual, 11/2019, A5E03735815-AH
Communication