Rockwell Automation Publication 1756-UM013B-EN-P - October 2019 63
1756-OBV8S Output Module Features Chapter 4
Safety Output Fault Reset
The I/O channel supports a module-level user-configurable ‘Latch Fault until
reset via output tag’ mode and recovers from only these field faults:
• Field Power Off Detection
• Safety Output ShortCircuitGround
• Safety Output Overload
The recovery time is 1 second for Field Power Off, and 10 seconds for Short or
Overload.
‘Latch Fault until reset via output tag’ mode is Enabled
When Latch Fault... mode is Enabled, the I/O channel holds safety output fault
indications until it checks that the field fault is removed. If the field fault is
removed, the channel clears the fault status only upon detecting that the
ResetFault in its consume assembly channel sees a rising edge.
‘Latch Fault until reset via output tag’ mode is Disabled
When Latch Fault... mode is Disabled (default), the I/O channel holds safety
output fault indications for 1 second until it checks if the field fault is removed. If
the field fault is removed, the channel clears the fault status only upon detecting
the consume data bit is low. The fault status will also be cleared by a module reset
or power cycle or when "Output State During Program Mode and
Communications Fault Mode" is configured to Off and any of the following
conditions:
• Controller in Program mode
• Controller or Safety task fault
• Communications fault
•Module inhibit
After the channel clears the fault, the I/O indicator (red) turns off. The output
data can now be controlled.
IMPORTANT If module outputs experience persistent high faults, consider cycling power
to the module to clear the error.
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