ProSoft Technology MVI69-101S - Manual (Page 111)

Reference MVI69-101S ♦ CompactLogix or MicroLogix Platform
IEC 60870-5-101 Slave Communication Module
ProSoft Technology, Inc. Page 111 of 149
March 16, 2009
Bit 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
Value S 2
-1 2 -2 2 -3 2 -4 2 -5 2 -6 2 -7 2 -8 2 -9 2 -10 2 -11 2 -12 2 -13 2 -14 2 -15
Example: a value of 4000hex is interpreted as 0.5
C_SE_NC
The measured short floating point command uses two words with double-word
addressing. For example, if you configured the following points:
# DB Address Monitor Monitor Require
# Point # (word*2) Point # DB Addr Select
# ------- ---------- ------- ------- -------
START
400 10 0 0 0
401 12 0 0 0
402 18 0 0 0
END
These points would be used as follows:
Inf. Object Address MVI69-101S Module Database Address
400 Words 5 and 6
401 Words 6 and 7
402 Words 9 and 10
5.3.6 Events
In order to improve the communication efficiency, most applications will require
the master to periodically poll for data changes with a higher priority than polling
for monitor data. Every time data change occurs, the slave should send this
information, typically with the date and time information on when the data change
occurred.