Command Interface With Controllers Of Other Manufacturers - Siemens SIMATIC ET 200SP Manual

Using the command interface

9.3 Command interface with controllers of other manufacturers

9.3 Command interface with controllers of other manufacturers
Functional principle
AS-i commands are read and written via the acyclic services of PROFINET/PROFIBUS. You
use the "Read_data_record" and "Write_data_record" (data record 2) services in the user
program of the IO controller/DP master for this.
Figure 9-1 Functional principle
Job parameters
You assign parameters for the "Read_data_record" and "Write_data_record" jobs. The
following parameters control the issuance of the commands:
● Index:
Defines the data record number = 2
● Length:
– With "Write_data_record", you specify the length of the send data depending on the
– With "Read_data_record", the CM AS-i Master ST signals the length of the receive
98
command.
data via the status nibble.
AS-Interface master CM AS-i Master ST (3RK7137-6SA00-0BC1)
Manual, 07/2017, A5E02655262020A/RS-AD/004