4. Configuration
161
CDC
(Common
Data Class)
Attribute
Identifier
Value
(decimal)
C
2
SEQ
T
pos-neg-zero
0
dir-quad-zero
1
WYE
angRef
Va
0
Vb
1
Vc
2
Aa
3
Ab
4
Ac
5
Vab
6
Vbc
7
Vca
8
Vother
9
Aother
10
Table 4-114. Elements represented in the RTU memory
Due to the flexibility of STRING type attributes size, the implementation of these elements in the
IEC 61131-3 environment is performed differently from the others. Instead of directly storing the
string character set, the symbolic variable that represents the attribute stores only a reference to a
table where, in fact, the string is. Thus, all attributes of STRING type have a "_REF" suffix. This
reference is actually the index to access a string table implemented in the GVL form. There are
totally 7 string tables separated by type:
GVL Name (Table)
Description
gaVisSTRING32
VISIBLE STRING32
gaVisSTRING64
VISIBLE STRING64
gaVisSTRING129
VISIBLE STRING129
gaVisSTRING255
VISIBLE STRING255
gaUCSTRING255
UNICODE STRING32
gaOCTED64
OCTET STRING64
gaOCTED255
OCTET STRING255
Table 4-115. Tables for access to STRING type attributes
For example, consider the setting in Figure 4-40:
Figure 4-40. Configuration example with STRING type attributes