Parameters and properties
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SIPROTEC PROFIBUS-DP - Communication profile
C53000-L1840-B001-03
2.5.2 Structure of a PROFIBUS-DP telegram with event list
In the following chapters 2.5.2.1 and 2.5.2.2, a typical construction of a PROFIBUS-
DP telegram with message blocks and handshake bytes for the retrieval of an "Event
list via PROFIBUS-DP" for a SIPROTEC device is shown and described.
The specific scope of the PROFIBUS-DP telegram for the particular SIPROTEC
device should be checked in the corresponding bus mapping documentation. (ref. to
page 3).
2.5.2.1 Telegram in input direction
Figure 2-2 Event list: Input telegram with message blocks and handshake byte
Range 1 All single-point and double-point indications that are also indicated in the event list are
part of Range 1 and are transmitted via the event list as well as the cyclic telegram
image.
Thereby an immediate reponse to a change of these single-point and double-point
indications is possible and these annunciations are also available for logging and
record keeping purposes in the event list with a time stamp.
Note:
Also with "Event list via PROFIBUS-DP" the PROFIBUS-DP communication is with
cyclic data exchange between the PROFIBUS-DP master and the PROFIBUS-DP
slaves of the SIPROTEC devices (no PROFIBUS-DP V1 or a-cyclic data exchange).
Handshake byte (Control_I)
from: byte offset = 0
SPARE (reserved = 0)
...
...
Message block #1
to max.: byte offset = 31
...
from max.: byte offset = 68
up to max.: byte offset = 99
Message block #2
Message block #3
Binary data
(Double-point / Single-point indications)
Measured values, Metered values,
Transformer tap position indications
Range 1
Range 2
Range 3
etc.
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