GE PACSystems RX7i Reference Manual page 133

Chapter 3. CPU Configuration
Memory Parameters
Point Fault References
122
The Point Fault References parameter must be enabled if you want to use
fault contacts in your logic. Assigning point fault references causes the CPU
to reserve additional memory.
When you download both the HWC and the logic to the PLC, the download
routine checks if there are fault contacts in the logic and if there are, it
checks if the HWC to download has the Point Fault References parameter
set to Enabled. If the parameter is Disabled, an error is displayed in the
Feedback Zone.
When you download only logic to the PLC, the download routine checks if
there are fault contacts in the logic and if there are, it checks if the HWC on
the PLC has the Point Fault References parameter set to Enabled. If the
parameter is Disabled, an error is displayed in the Feedback Zone.
PACSystems* RX7i, RX3i and RSTi-EP CPU Reference Manual GFK-2222AD