112 Rockwell Automation Publication 5069-UM004A-EN-P - April 2019
Chapter 4 Output Module Features
Table 25 describes what happens when a field power loss condition is resolved,
the error latch time, if set, has expired, and the module is recovered.
Field Power Loss Detection has a corresponding tag that can be examined in
the user program if a fault occurs. For information on module s, see Appendix
B,
Module Tag Definitions on page 231.
You can also monitor a point for the presence of a field power loss via the
diagnostics that are available in the Module Properties dialog box in Logix
Designer application.
Table 25 - Field Power Loss Detection - Compact 5000 I/O Digital Output Modules
Output
Behavior
Tag Value Diagnostic Value I/O Status
Indicator
State
SA Status
Indicator
Restarts in its
commanded
state.
One of the following:
• I.Ptxx.Fault tag =
0(5069-OA16, 5069-OB8,
and 5069-OW16)
• I.Ptxx.FieldPowerOff
tag = 0 (5069-OBV8S or
5069-OBV8SK)
• I.Ptxx.Fault tag = 0 (5069-
OBV8S or 5069-OBV8SK)
FieldPowerOff diagnostic = 0 Off Steady green
IMPORTANT The module can require up to 1 second to complete the recovery in addition
to the Output Error Latch Time.
IMPORTANT Keep in mind the following:
• For the 5069-OA16 modules, 5069-OB16, 5069-OW16 modules, Field
Power Loss detection is in regard to the SA Power bus.
• For the 5069-OBV8S and 5069-OBV8SK modules, Field Power Loss
detection is in regard to loss of LA power or SA power, or the presence of
Undervoltage or Overvoltage conditions on the LA Power bus or SA
Power bus.
• You can use 5069-FPD field potential distributors to establish new SA
power buses that are separate from the one that the controller or
EtherNet/IPâ„¢ adapter establishes.
• If separate external power supplies are used for each SA power bus, the
loss of field power from one SA power bus does not affect modules that
draw power from other SA power buses.
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