168 Rockwell Automation Publication 1756-UM001M-EN-P - February 2012
Chapter 10 Develop Applications
Figure 34 - Add-On Instructions in RSLogix 5000 Software
For more information about using Add-On Instructions, see the Add-
On Instructions Programming Manual, publication 1756-PM010
.
Monitoring Controller Status
The ControlLogix 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. Both instructions are available from the Input/Output tab of the
Instruction toolbar.
Figure 35 - GSV and SSV Instructions for Monitoring
When you add a GSV/SSV instruction to the program, the software displays the
valid object classes, object names, and attribute names for each instruction. 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.
Controller Organizer
Instruction Toolbar
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