PLC Tag Database feature support
- Last UpdatedAug 29, 2024
- 2 minute read
Allen-Bradley Logix TagDB Features Support Status
|
Category |
TagDB Item |
Logix Program Feature |
Auto-Build Feature |
Online Mode |
Offline Mode |
|
Data Type |
User-Defined |
User Defined (UDT) data structure |
Template |
Y |
Y |
|
Data Type |
Add-On-Defined |
Add-On-Defined (ADT) data structure |
Template |
Y |
Y |
|
Data Type |
Module-Defined |
I/O & Communication Module (MDT) data structure |
Not Supported |
N |
N |
|
Data Type |
Pre-Defined |
System Pre-Defined (PDT) data structure |
Template |
Y |
Y |
|
Scope |
Controller |
Global tag |
Instance / Attribute |
Y |
Y |
|
Scope |
Program |
Program tag |
Not Supported |
N |
N |
|
Usage |
Local |
Local tag for ADT |
Not Supported |
N* |
N |
|
Usage |
Input |
Parameter for ADT |
Attribute (non-specific field) |
Y |
Y |
|
Usage |
Output |
Parameter for ADT |
Attribute (non-specific field) |
Y |
Y |
|
Usage |
InOut |
Parameters for ADT |
Not Supported |
N |
N |
|
Tags |
Tag Type |
"Base" / "Alias" |
Attribute (non-specific field) |
Y |
Y |
|
Tags |
Data Type |
Refer to the entries under "Data Type" Category above |
n/a |
Y |
Y |
|
Tags |
Dimension |
Array dimension of "1" / "2" / "3" |
Attribute enumeration |
Y |
Y |
|
Tags |
Description |
Text field of 512 characters |
Attribute (Description field) |
N |
Y |
|
Tags |
External Access |
Tag properties for "Read/Write" / "Read Only" / "None" |
Attribute writeability properties |
Read/Write |
Y |
|
Tags |
Constant |
Tag properties of "true" / "false" |
Attribute (non-specific field) |
Y |
Y |
|
Tags |
Style |
Value display in Binary / Octal / Decimal / Hex / ASCII |
Attribute display style |
N |
N |
Note:Auto-Build Online Mode does not hide the Local Tags from displaying, but they are not supported for item subscription with OI ABCIP.
ADT InOut parameters and local tags are not shown up in the actual tag list under RSLogix5000 TagDB.
The Auto-Build feature supports only user-defined data types. It does not support other data types.