Allen-Bradley SLC-500 via TCP/IP - Data Types
- Last UpdatedAug 01, 2025
- 2 minute read
Note: The Allen Bradley SLC500 has many data types. The protocol makes a separate request for each different data type, and each request has a finite overhead. It is more efficient to read fewer data types, so you should move the I/O and other data into a few main blocks to be read by Plant SCADA.
|
Data Types |
Address Format |
Plant SCADA Data Type |
|---|---|---|
|
Status words |
S:w/b |
DIGITAL |
|
Timer |
Tf:w.t |
DIGITAL |
|
Timer |
Tf:w/b |
DIGITAL |
|
Counter |
Cf:w.c |
DIGITAL |
|
Counter |
Cf:w/b |
DIGITAL |
|
Control |
Rf:w.r |
DIGITAL |
|
Control |
Rf:w/b |
DIGITAL |
|
Binary |
Bf:w/b |
DIGITAL |
|
Integer |
Nf:w/b |
DIGITAL |
|
Output image |
O:O.o |
INT |
|
Input image |
I:O.o |
INT |
|
Status words |
S:w |
BCD / INT / LONG / LONGBCD/ REAL |
|
Timer |
Tf:w.T |
BCD / INT / LONG / LONGBCD/ REAL |
|
Counter |
Cf:w.T |
BCD / INT / LONG / LONGBCD/ REAL |
|
Control |
Rf:w.C |
BCD / INT / LONG / LONGBCD/ REAL |
|
Binary |
Bf:w |
BCD / INT / LONG / LONGBCD/ REAL |
|
Integer |
Nf:w |
BCD / INT / LONG / LONGBCD/ REAL |
Where:
|
f |
File Number 0 to 999 decimal |
|
:w |
Element number 0 to 999 decimal |
|
:O |
Element number 0 to 277 octal |
|
/b |
Bit Number 0 to 15 decimal |
|
/o |
Bit Number 0 to 17 octal |
|
.T |
Timer/Counter Sub Element: PRE - Preset Value |
|
.t |
Timer bits: EN - Enable |
|
.C |
Control Sub Element: LEN - Length |
|
.c |
Counter bits: CU - Count Up |
|
.r |
Control bits: EN - Enable |
Examples
|
Data Type |
DIGITAL |
|
Address |
N7:1/15 |
|
Comment |
Integer - File Number 7 Element Number 1 Bit Number 15 |
|
Data Type |
INT |
|
Address |
N7:3 |
|
Comment |
Integer - File Number 7 : Element Number 3 |
Allen-Bradley SLC500 Series PLCs support remapping reads only.