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Rockwell Automation Publication 5069-UM004A-EN-P - April 2019
Chapter 3
Input Module Features
Field Power Loss Detection
The Field Power Loss Detection feature monitors for the loss of field-side
power on an SA power bus.
When power is lost from an SA power bus, Compact 5000 I/O digital modules
that draw power from the SA power bus detect the loss of field power and fault.
As a result, fault data is sent to the controller. Keep in mind that all points on
the module fault when a field power is lost.
describes what happens when a field power loss
condition is
detected
.
To correct the issue, you must reapply field power to the test output.
describes what happens when a
field power is restored
and the error
latch time, if set, has expired.
5069-OBV8S
SIL2 CPU
5069-L3100ERMS2
Compact GuardLogix
5069-OBV8S
5069-IB8S
5069-IB8S
OUTPUT
OUTPUT
SA P
ow
er
MOD P
ow
er
Safety Modules
IMPORTANT
The 5069-IB8S and 5069-IB8SK are the only Compact 5000 I/O input
modules that support Field Power Loss Detection.
Table 16 - Field Power Loss Detection - Compact 5000 I/O Safety Input Module
Test Output
Behavior
Tag Value
Diagnostic Value
I/O Status
Indicator
State
SA Status
Indicator
• Faults
• Turns off
• I.Testxx.FieldPowerOff
tag = 1
• I.Testxx.Fault tag = 1
FieldPowerOff diagnostic = 1
Solid red
Off
Table 17 - Field Power Loss Detection - Compact 5000 I/O Safety Input Module
Test Output
Behavior
Tag Value
Diagnostic Value
I/O Status
Indicator
State
SA Status
Indicator
Restarts in its
commanded
state.
• I.Testxx.FieldPowerOff
tag = 0
• I.Testxx.Fault tag = 0
FieldPowerOff diagnostic = 0
Off
Steady green
IMPORTANT
The module can require up to 1 second to complete the recovery in addition
to the Input Error Latch Time.