Rockwell Automation 1715-OF8I Redundant I/O System User Manual - Manual (Page 139)

Rockwell Automation Publication 1715-UM001C-EN-P - March 2014 139
Digital I/O Operation Chapter 3
All words are 32-bit, although only the number of bits appropriate for each
module’s density are used.
This illustration offers an overview of the fault reporting process on
ControlLogix standard digital input modules.
A communication fault sets all bits in the module-fault word.
Fault and Status Reporting
between Output Modules
and Controllers
The 1715 digital output modules multicast fault and status data to any owner-
listening controllers. All output modules maintain a module-fault word, the
highest level of fault reporting. Some modules also use additional words to
indicate fault conditions.
The table lists the tags that can be examined in ladder logic to indicate when a
fault has occurred for a standard output module.
OpenWire INT (Radix = Binary) - 1 bit per point 0…15; 1 indicates open wire
ShortCircuit INT (Radix = Binary) - 1 bit per point 0…15; 1 indicates short circuit
Indeterminate INT (Radix = Binary) - 1 bit per point 0…15; 1 indicates indeterminate
Tag Description
Condition Set Bits
Communication fault All 32 bits are set to 1, regardless of the module’s density.
Module-fault Word
All Modules
42676
Bit 31 Bit 0
Tag Description
Simplex Digital Output Module Tags Include
Fault
DINT Fault (Radix = Binary) - 0 at least one module present, data good
- FFFFFFFF No Logix connection, data bad
ReadBack SINT (Radix = Binary) - 1 bit readback per point 0…7
GroupFault BOOL - 1 if any point on the module is faulted/failed
PtFault SINT (Radix = Binary) - 1 bit per point 0…7; 1 if point is faulted/failed
NoLoad SINT (Radix = Binary) - 1 bit per point 0…7; 1 indicates no load
ShortCircuit SINT (Radix = Binary) - 1 bit per point 0…7; 1 indicates short circuit
Duplex Digital Output Module Tags Include
Fault
DINT Fault (Radix = Binary) - 0 at least one module present
- FFFFFFFF No Logix connection
ReadBack SINT (Radix = Binary) - 1 bit readback per point 0…7
ModAFault BOOL - 0 Good, 1 fault or module not present