Rockwell Automation Publication 5094-UM001C-EN-P - April 2019 65
Output Module Features Chapter 4
• The I.Ptxx.ShortCircuit tag is set to 1.
For more information on how to use the modules, see Appendix B
,
Module Tag Definitions on page 137
.
In standard modules, when the short-circuit condition is removed, the following
occurs:
• The output restarts in its commanded state.
• The I/O status indicator for the output turns off.
• The I.Ptxx.ShortCircuit tag is reset to 0.
For safety modules, refer to the Safety Output Fault Reset
procedure on page 85.
For more information on the maximum current that you can apply
to an output, see the FLEX 5000 Modules Specifications Technical Data,
publication 5094-TD001
.
Thermal Shutoff
Thermal Shutoff helps prevent damage to the output that can result when an
output gets hotter than it can handle.
This feature is directly related to Short-Circuit Protection feature. The
increased temperature at the output results from an excessive load at the output.
That is, a load with high current is applied to the output. The high current heats
the output beyond an acceptable temperature and the output turns off.
In the safety output modules (5094-OB16S, 509-OB16SXT), if overload or
short circuit to ground occurs, the point will turn off. This trigger by current
threshold is exceeded, regardless of temperature.
For standard modules, when conditions exist that cause Thermal Shutoff to turn
off the output, the following occurs:
• The output turns off.
• The I/O status indicator for the output becomes solid red.
• The I.Ptxx.ShortCircuit tag is set to 1.
For more information on how to use the modules, see Appendix B
,
Module Tag Definitions on page 137
.
IMPORTANT These FLEX 5000 digital output modules are the only ones to support the
Thermal Shutoff feature:
• 5094-OB16
• 5094-OB16XT
• 5094-OB16S
• 5094-OB16SXT
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