ProSoft Technology PTQ-101M - Manual (Page 127)

Reference PTQ-101M ♦ Quantum Platform
IEC 60870-5-101 Master Communication Module
ProSoft Technology, Inc. Page 127 of 181
May 14, 2008
Block Format for Read
Block Format from Module (3x Register Data)
Word Offset in Block Data Field(s) Description
0 Sequence Counter This field contains a new value each time the
block is handled.
1 Block ID This field contains the block identification code
of 9903 for the block.
2 Event Count This field contains the number of events present
in the block. Values of 1 to 4 are valid.
3 to 16 Event 1 Event message
17 to 30 Event 2 Event message
31 to 44 Event 3 Event message
45 to 58 Event 4 Event message
59 to 61 Spare Not used
62 Event count in queue Number of events in queue still waiting to send
63 Event Overflow Event buffer overflow
The format of each 14 word data region in the block is shown in the following
table.
Word Offset Definitions Description
0 Session Index This field contains the session index used to
define the controlled unit in the module from
which the event was generated.
1 Sector Index This field contains the sector index used to
define the database within the controlled unit
from which the event was generated.
2 COT This field contains the COT for the event
message received from the IED. If the size of
the COT is a single byte, the originator address
will always be zero. The COT is in the LSB and
the originator address is in the MSB.
3 Reserved This field is reserved for future use and is added
here to keep the structure double-word aligned
for all platforms.
4 to 5 Point Index This field contains the point index in the remote
device that generated the event.
6 ASDU Type This field contains the ASDU type code for the
data contained in the message.
7 Milliseconds and
Seconds This word contains the seconds and
milliseconds when the event occurred.
8 Minutes and Hours This field contains the minutes and hours the
event occurred.
9 Month and Day This field contains the month and day of the
month the event occurred.
10 Year This field contains the year the event occurred.
11 Qualifier This field contains the point qualifier, quality or
sequence value as described in the protocol
specification.
12 to 13 Value This field contains the double word value for the
point associated with the event message.