Siemens SIMATIC NET PROFIBUS Instrukcja Obsługi Strona 189

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Description of the DP Functions, Data, and Error Codes
DP Base Programming Interface for CP 5613/CP 5614
C79000-G8976-C108-01
189
4.6.6 Format of Channel-Related Diagnostics
Meaning
A channel is identified by the slot of the module and the channel number. A slot
(module) can consist of several channels (for example, analog module with two
channels each with 4 bits).
Here, the data organization of the channel and messages such as "undervoltage"
or "short-circuit" are supplied for the individual channels of a module.
Note
Refer to the example later in the section.
Sequence of Entries each with Three Bytes
Channel-related diagnostic data consists of a sequence of entries all with the same
format and three bytes long (header byte, channel number, type of diagnostic
information).
Header Byte (ID Number) with Identification
The two most significant bits in the first byte of each entry have the value 10.
The remaining six bits in the first byte indicate the ID number. In ID-related
diagnostics, the appropriate bit is set for the ID number.
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