Siemens SIMATIC S7-1200 Manual page 151

In the example below, three AS-i devices have been addressed as "1" (a standard type
device), "2A" (an A/B node type device), and "3" (a standard type device):
①
②
③
Enter the AS-i slave address here:
Easy Book
Manual, 03/2014, A5E02486774-AF
AS-i slave address 1; Device: AS-i SM-U, 4DI; order number: 3RG9 001-0AA00
AS-i slave address 2A; Device: AS-i 8WD44, 3DO, A/B; order number: 8WD4 428-0BD
AS-i slave address 3; Device: AS-i SM-U, 2DI/2DO; order number: 3RG9 001-0AC00
Easy to communicate between devices
7.7 AS-i
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