2 PROFINET IO in SIPROTEC
2.6 Event List
42 SIPROTEC 4, Communication Module PROFINET IO, Communication Profile
C53000-L1840-C360-1, Edition 08.2012
Message-Block Number of the Event List
• The transmission of message blocks starts with message block 1. The message-block number is
increased by 1 for each transmission of message blocks until reaching message block 15. Subsequently,
the transmission starts again with message block 1. A maximum of 3 entries are transmitted per message
block from the event list.
• The message-block number only has the (initial) value 0 if the event list does not contain any entry when
initializing or restarting the SIPROTEC device. After the first entry has been transmitted to the event list
and the associated message-block number has been increased for the next entry, the value 0 is not
assigned anymore.
• If the telegram contains no entry or fewer than 3 entries in the event list, the unused message blocks are
filled with zeros.
• If no indication changes are transmitted, the message-block number remains constant during this time. In
this case, the message-block number transmitted last is transmitted repeatedly until new entries are made
in the event list.
Message-Block Number in the Process Alarm
• The message-block number is increased by 1 for each process alarm (3 messages max. per process
alarm), starting with message block 1 until reaching message block 15. Subsequently, the transmission
begins with message block 1 again.
• The first process alarm after the start of communication of the SIPROTEC device is sent with the
message-block number 1.
• If the process alarm is caused by only one or 2 messages, the unused message blocks are filled with
zeros.
Buffer Overflow of the Event List
The buffer overflow of the event list signals a set bit. This bit is reset when the buffer overflow no longer exists.
Buffer Overflow for Process Alarm
The bit for signaling a buffer overflow is not used.
Message Block #1 through Message Block #3
See Chapter 2.3.6.
com_profinet-io_profile_us.book Page 42 Friday, August 17, 2012 1:40 PM
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