MelsecQnA - Data Types
- Last UpdatedAug 04, 2025
- 2 minute read
|
Data Types |
Plant SCADA Data Format |
Plant SCADA Data Type |
Descriptions/ Special Usages/ Limitations/ Valid Ranges |
|---|---|---|---|
|
Input relay |
X<hexno> |
DIGITAL |
Read / Write |
|
Output relay |
Y<hexno> |
DIGITAL |
Read / Write |
|
Link input |
DX<hexno> |
DIGITAL |
Read / Write |
|
Link output |
DY<hexno> |
DIGITAL |
Read / Write |
|
Internal relay |
M<no> |
DIGITAL |
Read / Write |
|
Link relay |
B<hexno> |
DIGITAL |
Read / Write |
|
Latch relay |
L<no> |
DIGITAL |
Read / Write |
|
Annunciator |
F<no> |
DIGITAL |
Read / Write |
|
Edge relay |
V<no> |
DIGITAL |
Read / Write |
|
Step relay |
S<no> |
DIGITAL |
Read / Write |
|
Special relay |
SM<no> |
DIGITAL |
Read / Write |
|
Special relay for link |
SB<hexno> |
DIGITAL |
Read / Write |
|
Timer (Contact) |
TS<no> |
DIGITAL |
Read / Write |
|
Timer (Coil) |
TC<no> |
DIGITAL |
Read / Write |
|
Integrating Timer (Contact) |
SS<no> |
DIGITAL |
Read / Write |
|
Intergating Timer (Coil) |
SC<no> |
DIGITAL |
Read / Write |
|
Counter (Contact) |
CS<no> |
DIGITAL |
Read / Write |
|
Counter (Coil) |
CC<no> |
DIGITAL |
Read / Write |
|
Timer ( Current Value) |
TN<no> |
DIGITAL, INT, LONG, STRING, REAL |
Read / Write |
|
Integrating Timer (Current Value) |
SN<no> |
DIGITAL, INT, LONG, STRING, REAL |
Read / Write |
|
Counter (Current value) |
CN<no> |
DIGITAL, INT, LONG, STRING, REAL |
Read / Write |
|
Data register |
D<no> |
DIGITAL, INT, LONG, STRING, REAL |
Read / Write |
|
Link register |
W<hexno> |
DIGITAL, INT, LONG, STRING, REAL |
Read / Write |
|
Special register for link |
SW<hexno> |
DIGITAL, INT, LONG, STRING, REAL |
Read / Write |
|
Special register |
SD<no> |
DIGITAL, INT, LONG, STRING, REAL |
Read / Write |
|
File Register |
R<no> |
DIGITAL, INT, LONG, STRING, REAL |
Read / Write |
|
File Register |
ZR<hexno> |
DIGITAL, INT, LONG, STRING, REAL |
Read / Write |
|
Index register |
Z<no> |
DIGITAL, INT, LONG, STRING, REAL |
Read / Write |
Where:
|
<no> |
decimal number |
|
<hexno> |
hexadecimal number |
DX & DY are DIRECT read and writes of the I/O values. X & Y are read / written at the end of the scan. Thus the X / DX , Y / DY areas are one of the same.
EXAMPLES:
|
Data Type |
INTEGER |
|
Address |
V77 |
|
Comment |
Stator current |
|
Data Type |
DIGITAL |
|
Address |
X107 |
|
Comment |
Running feedback indicator |