ProSoft Technology MVI46-103M - Manual (Page 19)

Functional Overview MVI46-103M ♦ SLC Platform
IEC 60870-5-103 Master Communication Module
ProSoft Technology, Inc. Page 19 of 187
September 12, 2006
As shown in the table above, all bit types are addressed as bits in the modules
database.
Addressing the Data Types
The following table shows an example of how to address the data types in the
MVI46-103M:
Data Type Address Type Length Example
1 Bit 2 bits Address 160 refers to first and second bits from
word 10.
2 Bit 2 bits Address 160 refers to first and second bits from
word 10.
3 Word 4 words Address 50 refers to word 50, 51, 52, and 53.
4 Double-word 2 words Address 40 refers to two consecutive words
starting at word 80.
5 Bit 12 bits Address 180 refers to 12 consecutive bits
starting at the LSB of word 90.
9 Word 5 words Address 100 refers to 9 consecutive words
starting at word 100.
20 Bit 2 bits Address 160 refers to the first and second bits
from word 10.
Therefore, address 16000 represents bit zero in word 1000 of the module's
database. Short floating-point, 32-bit strings and integrated total values each
occupy a double-word space in the database. Therefore, short float database
address of 100 represents the two words, 200 and 201, in the modules database.
Identification objects are stored as byte values in the modules database.
Identification object address 1000 is stored in the module's database in word
addresses 500 to 505.
When setting the monitored data and commands, each point is defined by its
ASDU type, function code, and information number. Valid function codes are
listed in the following table:
Function Code Symbol Number
Distance Protection T(z) 128
Over-current Protection I>> 160
Transformer Differential
Protection rIt 176
Line Differential Protection rIl 192
Global Function Type GLB 255
Refer to Protocol Interoperability Documentation for a full listing of the protocol
support offered by the module.
Ladder logic in the SLC can control the module or devices on the serial network
using special control blocks. The following table lists the special control codes
(block numbers) used by the module: