Communication
11.4 AS-i
S7-1200 Programmable controller
System Manual, V4.2, 09/2016, A5E02486680-AK
979
Assigning the AS-i slave address
In an AS-i network, each device is assigned an AS-i slave address. This address can range
from 0 through 31; however, address 0 is reserved only for new slave devices. The slave
addresses are 1(A or B) to 31(A or B) for a total of up to 62 slave devices.
"Standard" AS-i devices use the entire address, having a number address without the A or B
designation. "A/B node" AS-i devices use the A or B portion of each address, enabling each
of the 31 addresses to be used twice. The address space range is 1A to 31A plus 1B to 31B.
Any address in the range of 1 - 31 can be assigned to an AS-i slave device; in other words, it
does not matter whether the slaves begin with address 21 or whether the first slave is
actually given the address 1.
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):
AS-i slave address 1; Device: AS-i SM-U, 4DI; article number: 3RG9 001-0AA00
AS-i slave address 2A; Device: AS-i 8WD44, 3DO, A/B; article number: 8WD4 428-0BD
AS-i slave address 3; Device: AS-i SM-U, 2DI/2DO; article number: 3RG9 001-0AC00
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