106 Rockwell Automation Publication 1769-UM011H-EN-P - April 2012
Chapter 7 Develop Applications
Monitor Controller Status
The CompactLogix controller uses Get System Value (GSV) and Set System
Value (SSV) instructions to get and set (change) controller data. The controller
stores system data in objects. There is no status file, as in the PLC-5 processor.
The GSV instruction retrieves the specified information and places it in the
destination. The SSV instruction sets the specified attribute with data from the
source.
When you enter a GSV/SSV instruction, the programming software displays the:
• valid object classes.
• object names.
• attribute names.
For the GSV instruction, you can get values for all the available attributes. For the
SSV instruction, the software displays only those attributes you are allowed to set.
In some cases, there will be more than one of the same type of object, so you
might also have to specify the object name. For example, there can be several tasks
in your application. Each task has its own TASK object that you access by the task
name.
You can access these object classes:
• AXIS
• CONTROLLER
• CONTROLLERDEVICE
• CST
• DF1
• FAULTLOG
• MESSAGE
• MODULE
• MOTIONGROUP
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