User manual

74 Publication 1756-RM093F-EN-P - January 2010
Chapter 7 Monitor Status and Handle Faults
Get System Value (GSV) and Set System Value (SSV) Instructions
The GSV and SSV instructions let you get (GSV) and set (SSV)
controller system data stored in device objects. When you enter a
GSV/SSV instruction, the programming software displays the valid
object classes, object names, and attribute names for each instruction.
Restrictions exist for using the GSV and SSV instructions with safety
components.
GuardLogix System Faults
Faults in the GuardLogix system fall into these three categories:
• Nonrecoverable controller faults
• Nonrecoverable safety faults
• Recoverable faults
For information on handling faults, refer to the GuardLogix Controllers
User Manual, publication 1756-UM020
, or the 1768 Compact
GuardLogix Controllers User Manual, publication 1768-UM002
.
IMPORTANT
The safety task cannot perform GSV or SSV operations on
standard attributes.
The attributes of safety objects that can be written by the
standard task are for diagnostic purposes only. They do not
affect safety task execution.
Additional Resources
Resource Description
GuardLogix Controllers User Manual,
publication 1756-UM020
Provides information on which safety
attributes are accessible via GSV and SSV
instructions
1768 Compact GuardLogix Controllers
User Manual, publication 1768-UM002
Logix5000 Controllers General
Instructions Reference Manual,
publication 1756-RM003
Contains more information on using GSV and
SSV instructions