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Chapter 9. Diagnostics
9.3.2
Using Fault Contacts
Fault (-[F]-) and no-fault (-[NF]-) contacts can be used to detect the presence of I/O faults in the
system. These contacts cannot be overridden. The following table shows the state of fault and no-
fault contacts.
Condition
Fault Present
Fault Absent
An NF contact will be ON (F contact will be OFF) when the referenced I/O point is not faulted, or the
referenced I/O point does not exist in the hardware configuration.
Fault Locating References (Rack, Slot, Bus, Module)
The PACSystems CPU supports reserved fault names for each rack, slot, bus, and module. By
programming these names on the FAULT and NOFLT contact instructions, logic can be executed in
response to faults associated with configured racks and modules.
Fault Locating Reference Name Format
These fault names can only be programmed on the FAULT and NOFLT contacts. The reserved fault
names are always available. It is not necessary to enable a special option, such as point faults.
Fault
Reserved
Reference Type
Name
Rack
#RACK_000r
Slot
#SLOT_0rss
Bus
#BUS_0rssb
(Genius only)
Module
#M_rssbmmm
(Genius only)
These fault names do not correspond to %SA, %SB, %SC, or to any other reference type. They are
mapped to a memory area that is not user-accessible. Only the name is displayed.
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PACSystems* RX7i, RX3i and RSTi-EP CPU Programmer's Reference Manual
[F]
[NF]
ON
OFF
OFF
ON
Comment
Where r is rack number 0 to 7.
Where r is rack number 0 to 7 and
ss is slot number 0 to 31.
Where r is rack number 0 to 7,
ss is slot number 0 to 31, and
b is the bus number (1 or 2).
Where r is rack number 0 to 7,
ss is slot number 0 to 31,
b is the bus number (1 or 2), and
mmm is the Bus Address number 000 to 255.
GFK-2950C
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