August 2015
Beginner to intermediate
224 pages
4h 36m
English
Content preview from Learning RSLogix 5000 ProgrammingBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Get System Value and Set System Value
Legacy Rockwell PLCs (PLC5 and SLC500) had a dedicated status file (S2), which was continuously updated by the controller with system values. The ControlLogix platform has removed the dedicated status file in order to reduce the controller processing load. In place of the dedicated status file, ControlLogix has provided two self-serve instructions that allow for direct control over the system value access that are neatly organized into class objects. The Get System Value (GSV) instruction will retrieve a system value status from the controller that can update a specified destination tag with that value. The Set System Value (SSV) instruction will update a controller system value status from a specified source ...
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