Siemens SIMATIC S7-1200

Communication
11.4 AS-i
S7-1200 Programmable controller
982 System Manual, V4.2, 09/2016, A5E02486680-AK
11.4.2.2
Configuring slaves with STEP 7
Transferring AS-i digital values
The CPU accesses the digital inputs and outputs of the AS-i slaves through the AS-i master
CM1243-2 in cyclic operation. The data is accessed through I/O addresses or by means of a
data record transfer.
①
AS-i slave address 1
②
AS-i slave address 2A
③
AS-i slave address 3
Access to the digital data is performed here in bytes (in other words, one byte is assigned to
each AS-i digital slave). When you configure the AS-i slaves in STEP 7, the I/O address for
accessing the data from the user program is displayed in the inspection window for the
respective AS-i slave.
The digital input module (AS-i SM-U, 4DI) in the AS-i network above has been assigned
slave address 1. By clicking on the digital input module, the "AS interface" tab in the device
"Properties" displays the slave address, as shown below: