Siemens SIMATIC ET 200SP CM 1xDALI - 900 CM 1 Xdali Communication Model; Configuring the CM 1 Xdali; Structure of CM Command;Response

ET 200SP CM 1xDALI Communication Model Description
Programming Manual, 12/2019, A5E47581955-AA
11
CM 1xDALI communication model
2
2.1 Configuring the CM 1xDALI
Before using a CM 1xDALI, configure it with the power on. Use the GSD file in the
engineering system for configuring or do a reconfiguring via the parameter data record.
For how to configuring the CM 1xDALI, refer to
Appendix A Parameter data record of the
manual
ET 200SP Communication module CM 1xDALI
(https://support.industry.siemens.com/cs/ww/en/view/109769428)
.
2.2 Structure of CM command/response
Through CM commands, the CPUs communicate with the CM 1xDALI module to configure
or query DALI devices. A DALI device can be a control gear or input device. When a CPU
sends a CM command to a CM 1xDALI module, the CM 1xDALI module replies with a CM
response.
Only CPUs can send a CM command to the CM 1xDALI module.
Structure of the CM command/response
The structure of the CM commands and CM responses are the same. The maximum length
of the CM command/response is 100 bytes.
Byte
0
1
2
3
4~99
Bit
Bit 7
Bit 6 to Bit 0
Descrip-
tion
Version Checksum Length Response Flag Command ID Parameters
Value 16#A0 The checksum of
the whole mes-
sage
1
Total bytes of the
CM com-
mand/response.
Response flag of the CM
command. The flag of the
CM commands sent from
the CPU must be set to 0.
The flag of the CM response
from the CM 1xDALI mod-
ules must be set to 1.
ID of the CM
command or
response. The
CM command
and its re-
sponse have
the same ID.
The parame-
ters of the CM
command or
the CM re-
sponse.
1
The algorithm of the checksum is as follows.
#tempSum := 0;
FOR #idx := 2 TO #length – 1 DO
#tempSum += #message[#idx];
END_FOR;
#checksum := 16#FF XOR #tempSum