No. 40: Write_Parameter_String - Siemens SIMATIC ET 200SP Manual

Using the command interface
9.4 Description of the AS-i commands
9.4.29

No. 40: Write_Parameter_String

Meaning
This command sends a parameter string in accordance with AS-i slave profile 7.4 to the
AS-i master. The master forwards the parameter string to the AS-i slave address specified in
the send buffer.
This command transfers a send buffer with up to 223 bytes to the AS-i master. The
AS-i master calculates the actual number of parameter bytes to be sent to the AS-i slave
from byte 2 of the send buffer.
The AS-i master does not evaluate any other information in the parameter string. It transfers
this to the AS-i slave transparently. While transmission of the parameter string is being
executed, there is no transfer of user data / analog data with the addressed AS-i slave.
Structure of the job data in the send buffer
Table 9- 56 Structure of the job data in the send buffer
Byte
0
1
2
3
4
...
n + 1
n + 2
Maximum value for n = 220
148
Meaning
Command number: 40
H
Slave address
Number of parameter bytes
Parameter string byte 1
Parameter string byte 2
...
Parameter string byte n - 1
Parameter string byte n
AS-Interface master CM AS-i Master ST (3RK7137-6SA00-0BC1)
Manual, 07/2017, A5E02655262020A/RS-AD/004