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7-10 Genius Modular Redundancy Flexible Triple Modular Redundant (TMR) System
User’s Manual – March 1995
GFK-0787B
System Status (%S) References
System status references are pre-defined locations and nicknames. They can be included
in the application program to check for fault-related conditions. For example, status
references can be used to:
Detect forces and overrides.
Monitor the fault tables.
For a complete listing of %S references, see the Series 90-70 PLC Reference Manual.
Monitoring Forces and Overrides
The GMR software cannot detect point forces and overrides, and their use is not
recommended and may affect the results of autotesting. Forces and/or overrides can also
affect GMR voting of inputs and outputs. Therefore, if the system will include the use of
forces and/or overrides, it is important to include application program logic to detect them.
These system status references detect forces and overrides in an individual PLC:
%S0011 OVR_PRE when set, indicates an override in %I, %Q,
%M, or %G memory.
%S0012 FRC_PRE when set, indicates a force on a Genius point.
Monitoring the Fault Tables
These system status references are associated with the fault tables in an individual PLC:
%S0009 SY_FULL when set, indicates that the PLC Fault Table is
full.
%S0010 IO_FULL when set, indicates that the I/O Fault Table is
full.
%SC0010 SY_FLT when set, indicates that an entry has been
placed in the PLC Fault Table.
%SC0011 IO_FLT when set, indicates that an entry has been
placed in the I/O Fault Table.
%SC0012 SY_PRES when set, indicates that there is presently at
least one entry in the PLC Fault Table.
%SC0013 IO_PRES when set, indicates that there is presently at
least one entry in the I/O Fault Table.