Siemens SIMATIC ET 200SP CM 1xDALI - Sending;Receiving CM Commands

CM 1xDALI communication model
2.3 Sending/receiving CM commands
ET 200SP CM 1xDALI Communication Model Description
12 Programming Manual, 12/2019, A5E47581955-AA
2.3 Sending/receiving CM commands
To send the CM command, use Process Image or Data Record.
CM commands over Process Image
The CM 1xDALI module has 16 bytes for Process Image input and 16 bytes for Process
Image output. Due to this limitation, only the CM commands with a length of 15 bytes or less
can be performed over Process Image. If you perform a CM command with a length is longer
than 15 bytes with Process Image, CM 1xDALI replies to the command with an error
message in a CM response.
Table 2- 1 Structure of Process Image
Byte
0
1 to 15
Output
Description
CM command index
1
CM command
3
Input
Description CM response index
2
CM response
3
1
The CPU must set an index for every CM command it sends. The index must be differ-
ent from the last sent command and the index cannot be 0.
2
If the received C
M response is the same as the CM command index, the CPU receives
the CM response of the command sent before.
3
For the detailed description for CM command/response, refer to
CM 1xDALI command
list (Page 18).