Siemens SIMATIC ET 200SP Manual page 54

Data exchange between the user program and AS-i slaves
7.2 Transmitting AS-i digital values
Configuration example
The following graphic shows an example of addressing 4 digital slaves. In the example, you
configure the start addresses n = 40 for the I/O data in
The bits with a gray background are relevant for the user program. The bits with a white
background are not relevant for the user program, because AS-i slave bits are not assigned
here.
Figure 7-1 Example of addressing 4 digital slaves
The AS-i slave with address 3 and with two inputs and two outputs, referred to as a 2I/2O
module, occupies bits 0 and 1 in input byte 41 and bits 2 and 3 in output byte 41 in the
graphic, for example.
Figure 7-2
Figure 7-3
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Example to show assignment of the AS-i connections of the 2I/2O modules to the data
bits of the input bytes for slave with address 3
Example to show assignment of the AS-i connections of the 2I/2O modules to the data
bits of the output bytes for slave with address 3
STEP 7
AS-Interface master CM AS-i Master ST (3RK7137-6SA00-0BC1)
Manual, 07/2017, A5E02655262020A/RS-AD/004
.