GE General Electric Noise Reduction Machine GFK-0787B User Manual

tModular Redundancy Flexible Triple Modular Redundant (TMR) System 

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:

H Detect forces and overrides.
H Monitor the fault tables.

For a complete listing of %S references, see the Series 90-70 PLC Reference Manual.

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:

when set, indicates an override in %I, %Q,
%M, or %G memory.

when set, indicates a force on a Genius point.

These system status references are associated with the fault tables in an individual PLC:

when set, indicates that the PLC Fault Table is
full.

when set, indicates that the I/O Fault Table is
full.

when set, indicates that an entry has been
placed in the PLC Fault Table.

when set, indicates that an entry has been
placed in the I/O Fault Table.

when set, indicates that there is presently at
least one entry in the PLC Fault Table.

when set, indicates that there is presently at
least  one  entry in the I/O Fault Table.