Data Types
- Last UpdatedDec 02, 2024
- 1 minute read
When configuring your variable tags to communicate with the ControlLogix system, you must select a Plant SCADA data type that is compatible with the data type used by the ControlLogix system controller.
Ideally, you should match the data type of the Plant SCADA variable tag with the data type of the mapped ControlLogix system PLC tag as per the following table:
|
ControlLogix Data Description |
Plant SCADA Address Format |
Access rights |
Plant SCADA Data Type |
|
BOOL |
<TagName> |
R/W |
DIGITAL |
|
SINT |
<TagName> |
R/W |
BYTE |
|
INT |
<TagName> |
R/W |
INTEGER |
|
DINT |
<TagName> |
R/W |
LONG |
|
REAL |
<TagName> |
R/W |
REAL |
|
STRING |
<TagName> |
R/W |
STRING |
For example, if the ControlLogix tag you are addressing uses a "float" data type, you should select "real" in the Data Type field of the Variable Tags settings.
Note: Plant SCADA reads a string data type from the ControlLogix PLC as a null terminated string. Therefore, if you need to read a 12 character string, you will have to configure the string length on the PLC to at least 13 characters to allow for the null character.