Data Areas And Diagnosis; Cyclic Input And Output Data; Control_I Byte; Standard Mapping 3-4 - Siemens SIPROTEC Manual

Redundant PROFIBUS DP interface
1.4

Data areas and Diagnosis

1.4.1

Cyclic input and output data

1.4.1.1

Control_I byte

Reference
Bit assignment
Message block
number
22
The cyclic messages of a redundant PROFIBUS DP slave interface of the SIPROTEC
devices always contain (beside the current values of the input and output data) an
event list for transmission of indications with time stamp (ref. to chap. 1.6.3).
The structure of a PROFIBUS DP telegram with event list is described in the manual
"SIPROTEC Communication module, PROFIBUS DP - Communication profile", chap.
"Structure of a PROFIBUS DP telegram with event list" and is also valid for messages
of the SIPROTEC devices with redundant PROFIBUS DP.
For the redundancy function, the before reserved "SPARE" bytes are used and now
called "Control_I_1" as well as "Control_O_1" subsequently.
The meaning of the individual bits of the handshake and redundancy control bytes in
output and input direction are summarized again in this chapter.
Handshake byte for the event list.
Standard mappings 3-1 and 3-3, ref. to chap. 3.2.4
Standard mapping 3-4, ref. to chap. 5.2.4
7 6 5
Message block
number
Figure 1-4 Handshake byte "Control_I" (input direction)
• With each transmission of the message blocks (entries from the event list, max. 3
entries per telegram), the message block number is increased sequentially by 1,
starting with 1 (0001
• The message block number only has the (initial) value 0 if following the initial or
reboot of the SIPROTEC device no entries are available in the event list yet.
After transmission of the first entry in the event list and the associated increment of
the message block number, this number never assumes the value 0 again (unless
another initial or reboot takes place).
• If the telegram contains none or less than 3 entries in the event list then the unused
message blocks are completely filled up with zeros.
Control_I
4 3 2 1
) up to 15 (1111 ), and thereafter starting with 1 again.
bin bin
SIPROTEC PROFIBUS DP - Bus mapping 6MD662/3/4
0 Bit position
Meaning
C53000-L1840-B011-03