CHAPTER 2: MODBUS COMMUNICATION
MODBUS MEMORY MAP
D90
PLUS
LINE DISTANCE PROTECTION SYSTEM – COMMUNICATIONS GUIDE
191
F239: Daylight savings time day instance (16-bit enumeration)
This format code indicates the week for the day to start and stop daylight savings time.
F270: Fault report VT substitution (16-bit enumeration)
F300: FlexLogic BASE type (6-bit type)
The FlexLogic BASE type is 6 bits and is combined with a 9-bit descriptor and 1 bit for
protection element to form a 16-bit value. The combined bits are of the form:
PTTTTTTTDDDDDDDD, where P bit if set, indicates that the FlexLogic type is associated
with a protection element state and T represents bits for the BASE type, and D represents
bits for the descriptor.
The values in square brackets indicate the base type with P prefix [PTTTTTTT] and the
values in round brackets indicate the descriptor range.
F400: CT/VT bank selection (UR_UINT16)
F491: Direct analog default mode (16-bit enumeration)
This format code indicates input default mode.
F500: Input and output states (16-bit packed bitfield)
This format code indicates the states of various inputs and outputs. The number of
registers used is determined by the specific data item. A bit value of 0 indicates off and a
bit value of 1 indicates on.
F502: Element operate states (16-bit packed bitfield)
Each bit indicates the operate state for an element. See the F124 format code for a list of
element IDs. The operate bit for element ID
x
is bit [
X
mod 16] in register [
X
/16]. A bit value
of 0 indicates off and a bit value of 1 indicates on.
Enumeration Value
0
First
1
Second
2
Third
3
Fourth
4
Last
Enumeration Value
0
None
1
I0
2
V0
Enumeration Value
0
Card 1 Contact 1 to 4
1
Card 1 Contact 5 to 8
2
Card 2 Contact 1 to 4
3
Card 2 Contact 5 to 8
4
Card 3 Contact 1 to 4
5
Card 3 Contact 5 to 8
Enumeration Value
0
Default Value
1
Last Known
