132 Rockwell Automation Publication 1715-UM001J-EN-P - December 2020
Chapter 4 Digital I/O Operation
Fault and Status Reporting
between Input Modules
and Controllers
The 1715 digital input modules unicast fault and status data to any owner-
controllers. All input modules maintain a module-fault word, the highest level
of fault reporting. Additional fault information is provided in separate tags.
The table lists the tag that can be examined in ladder logic to indicate when a
fault has occurred for a standard input module.
All words are 32-bit, although only the number of bits appropriate for the
density of each module are used.
This illustration offers an overview of the fault reporting process on 1715
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 unicast fault and status data to any owner-
controllers. All output modules maintain a module-fault word, the highest level
of fault reporting. Additional fault information is provided in separate tags.
The table lists the tags that can be examined in ladder logic to indicate when a
fault has occurred for a standard output module.
Tag Description
Module-fault word This word provides fault summary reporting. its tag name is Fault. This word is available on all digital input modules.
Fault DINT Fault (Radix = Binary) - 0 at least one module present
- FFFFFFFF No Logix connection, all additional tags are not valid
Simplex Digital Input Module Additional Tags Include
GroupFault BIT - 1 if any point on the module is faulted/failed
PtFault INT (Radix = Binary) - 1 bit per point 0…15; 1 if point is faulted/failed
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
Duplex Digital Input Module Additional Tags Include
ModAFault BOOL - 0 Good, 1 fault or module not present
ModBFault BOOL - 0 Good, 1 fault or module not present
GroupFault BOOL - 1 if any point on either module is faulted/failed
ModAGroupFault BOOL - 1 if any point on Module A is faulted/failed
ModBGroupFault BOOL - 1 if any point on Module B is faulted/failed
PtFault INT (Radix = Binary) - 1 bit per point 0…15; 1 if point is faulted/failed on both modules
ModAPtFault INT (Radix = Binary) - 1 bit per Channel 0…15; 1 if channel has failed on module A
ModBPtFault INT (Radix = Binary) - 1 bit per Channel 0…15; 1 if channel has failed on module B
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
Condition Set Bits
Communication fault All 32 bits are set to 1, regardless of the module’s density.
Module-fault Word
All Modules
Bit 31 Bit 0
42676
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