Chapter 4. Ladder Diagram (LD) Programming
GFK-2950C February 2018 95
4.4.4 No Fault Contact
A No Fault (NOFLT) contact detects faults in discrete or analog reference addresses, or locates faults
(rack, slot, bus, module). NOFLT passes power flow if its associated variable or location does not
have a point fault.
■ To guarantee correct indication of module status, use the reference address (%I, %Q, %AI, %AQ)
with the FAULT/NOFLT contacts.
■ To locate a fault, use the rack, slot, bus, module fault locating system variables with a
FAULT/NOFLT contact.
■ For I/O point fault reporting, you must configure your Hardware Configuration (HWC) to enable
the PLC point faults.
Note: The fault indication of a given module is cleared when the associated fault is cleared from the
fault table.
Operands
variables in %I, %Q, %AI, and %AQ memories, and
predefined fault-locating references
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