Adding Tags to Your Project
- Last UpdatedFeb 03, 2025
- 2 minute read
A separate variable tag must be added to your Plant SCADA project for each data-point (memory register) on the I/O devices you want to communicate with.
ControlLogix system PLC controllers use a tag-based addressing system. The tags associated with a controller are each assigned a unique name using the RSLogix 5000 Enterprise Series controller configuration software. See ControlLogix PLCs - Software Requirements.
You use the ControlLogix system PLC tag name when you specify the address for a tag in your Plant SCADA project. However, any square braces "[ ]" should be replaced with "{ }", and forward slashes "/" should be used to access bits within words, rather than a period ".".
Note: The ABCLX driver supports Individual Tag Addressing and Array Tag Addressing. Addressing Program Tags support is also available for both these types of addressing. Local tag addressing is also supported.
Your Plant SCADA variable tags are defined using the Variable Tags view. For Plant SCADA to compile correctly, you must include appropriate values for the following fields:
|
Field |
Value |
|
Variable Tag Name |
A unique name per project for the variable tag (up to 79 alphanumeric characters in Version 6, 32 characters for earlier versions). This can be used by Plant SCADA graphic pages and in Cicode where defined. |
|
Data Type |
The type of variable. Select from the drop-down menu. It must be one of the predefined types used in Plant SCADA. |
|
I/O Device Name |
The name of an I/O Device defined in the I/O Devices form which is used to identify the ControlLogix PLC controller (CPU module). |
|
Address |
The name of a predefined ControlLogix system PLC tag, either Individual Tag Addressing, Array Tag Addressing or addressed as part of a Addressing Program Tags. |
Note: Plant SCADA does not indicate any compile errors if an invalid address is entered in the Variable Tag settings. Any variable tag values with an invalid address will display as "#COM" at run time on the graphic pages where they have been positioned.