How to read the status of Siemens PLC redundant system

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The Siemens plc function block "H_Status" can output an operating status RUN/STOP and the status of the H system Master/Reserve. Functional Overview:
Display the operating status of the CPU in the racks 0 and 1 (RUN/STOP)
Display the status of the CPU in racks 0 and 1 (Master/Reserve)
Reporting redundancy loss in H system
The function block is called cyclically in the time interrupt OB (OB 35) and is called cyclically in the corresponding alarm OB. The SFC51 RDSYSST system function can be called and the information number SZL ID W#16#xy71 can be specified to read out the necessary information, and this information is output at the output of the function block. When the CPU of an H system fails, the corresponding message is triggered.

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