Rockwell Automation 1715-OF8I Redundant I/O System User Manual - Manual (Page 138)

138 Rockwell Automation Publication 1715-UM001C-EN-P - March 2014
Chapter 3 Digital I/O Operation
De-energize-to-trip
During output, when a system fault occurs, the output module can be set so that
the output is de-engergized. This is on a point-by-point basis. The following are
examples of de-energize-to-trip uses:
• Motor starters
• Safety contactors
Disable Line Test
The digital output module incorporates line test functionality that can report
and indicate ‘no load’ field faults. This functionality can be enabled or disabled
by checking or unchecking the box. This is on a point-by-point basis.
Fault and Status Reporting
between Input Modules
and Controllers
The 1715 digital input modules multicast fault and status data to any owner-
listening controllers. All input modules maintain a module-fault word, the
highest level of fault reporting. Some output modules also use additional words
to indicate fault conditions.
The table lists the tag that can be examined in ladder logic to indicate when a
fault has occurred for a standard input 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
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