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Redundant PROFIBUS DP interface
22
SIPROTEC PROFIBUS DP - Bus mapping 6MD662/3/4
C53000-L1840-B011-03
1.4
Data areas and Diagnosis
1.4.1
Cyclic input and output data
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.
1.4.1.1
Control_I byte
Handshake byte for the event list.
Reference
Standard mappings 3-1 and 3-3, ref. to chap. 3.2.4
Standard mapping 3-4, ref. to chap. 5.2.4
Bit assignment
Figure 1-4 Handshake byte “Control_I” (input direction)
Message block
number
•
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
bin
) up to 15 (1111
bin
), and thereafter starting with 1 again.
•
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
re
se
rv
ed
=
0
Message block
0
1
2
3
4
5
6
7
Bit position
Meaning
Bu
ffe
r over
flow
Mess
age lost
number
Summary of Contents for 6MD662
Page 6: ...Preview 6 SIPROTEC PROFIBUS DP Bus mapping 6MD662 3 4 C53000 L1840 B011 03 ...
Page 8: ...Revision index 8 SIPROTEC PROFIBUS DP Bus mapping 6MD662 3 4 C53000 L1840 B011 03 ...
Page 12: ...Table of contents 12 SIPROTEC PROFIBUS DP Bus mapping 6MD662 3 4 C53000 L1840 B011 03 ...
Page 72: ...Standard mapping 3 2 72 SIPROTEC PROFIBUS DP Bus mapping 6MD662 3 4 C53000 L1840 B011 03 ...
Page 86: ...Index 86 SIPROTEC PROFIBUS DP Bus mapping 6MD662 3 4 C53000 L1840 B011 03 ...