In the following table, the available syntax of the tag names is summarized.
|
Tag |
Meaning |
Address range (decimal) |
|
SM (91h) |
Special relay, 1-bit value |
0000 to 2047 |
|
SD (A9h) |
Special register, 16-bit value |
0000 to 2047 |
|
X (9Ch) |
Input, 1-bit value |
0000 to 8191 |
|
Y (9Dh) |
Output, 1-bit value |
0000 to 8191 |
|
M (90h) |
Internal relay, 1-bit value |
0000 to 8191 |
|
L (92h) |
Latch relay, 1-bit value |
0000 to 8191 |
|
F (93h) |
Annunciator, 1-bit value |
0000 to 2047 |
|
V (94h) |
Edge relay, 1-bit value |
0000 to 2047 |
|
B (A0h) |
Link relay, 1-bit value |
0000 to 8191 |
|
D (A8h) |
Data register, 16-bit value, unsigned |
000000 to 012287 |
|
W (B4h) |
Link register, 16-bit value, unsigned |
0000 to 8191 |
|
TS/TC (C1h)/(C0h) |
Contact/Coil timer, 1-bit value |
0000 to 2047 |
|
TN (C2h) |
Current value timer, 16-bit value, unsigned |
0000 to 2047 |
|
SS/SC (C7h)/(C6h) |
Contact/Coil retentive timer, 1-bit value |
0000 to 2047 |
|
SN (C8h) |
Current value retentive timer, 16-bit value, unsigned. |
0000 to 2047 |
|
CS/CC (C4h)/(C3h) |
Contact/Coil counter, 1-bit value |
0000 to 1023 |
|
CN (C3h) |
Current value counter, 16-bit value, unsigned. |
0000 to 1023 |
|
SW (B5h) |
Link special register, 16-bit value, unsigned. |
0000 to 2047 |
|
SB (A1h) |
Link special relay, 1-bit value |
0000 to 2047 |
|
DX (A2h) |
Direct input, 1-bit value |
0000 to 8191 |
|
DY (A3h) |
Direct output, 1-bit value |
0000 to 8191 |
|
R (AFH) |
File register – Block switching method, 16-bit value |
|
|
Z (CCH) |
Index register, 16-bit value |
|
|
ZR (B0H) |
File register – Serial number access method, 16-bit value |
|
Our implementation of MELSEC protocol also supports the following extension tags:
|
Tag |
Meaning |
Address range (decimal) |
|
DS (A8h) |
Data register, 16-bit value, signed |
000000 to 012287 |
|
DD (A8h) |
Data register, 32-bit value, signed |
000000 to 012286 Use regular D registers, |
|
FL (A8h) |
Data register, 32-bit float value |
000000 to 012286 Use regular D registers, address increased by 2 |
|
WS (B4h) |
Link register, 32-bit signed value |
0000 to 8191 Use |
All custom tags consist of multiple regular 16-bit tags in the least to the most significant word order.